{"id":181276,"date":"2026-08-18T08:00:14","date_gmt":"2026-08-18T08:00:14","guid":{"rendered":"https:\/\/pabau.com\/?p=181276"},"modified":"2026-08-18T08:20:02","modified_gmt":"2026-08-18T08:20:02","slug":"icd-10-code-q02","status":"publish","type":"post","link":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-q02\/","title":{"rendered":"ICD-10 Code Q02: Microcephaly diagnosis, coding, and documentation"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code Q02: Microcephaly diagnosis, coding, and documentation\",\"description\":\"ICD-10 Code Q02 (Microcephaly) is a billable FY2026 diagnosis code. Learn clinical criteria, documentation requirements, coding guidelines, exclusions, and CPT crosswalks.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-q02\/\",\"audience\":{\"@type\":\"MedicalAudience\",\"audienceType\":\"Clinician\"},\"reviewedBy\":{\"@type\":\"Person\",\"name\":\"Dr Vanja Kitanova\",\"jobTitle\":\"Medical Reviewer\",\"affiliation\":{\"@type\":\"Organization\",\"name\":\"Pabau\"},\"knowsAbout\":[\"Medical Coding\",\"Clinical Documentation\",\"Healthcare Billing\",\"Clinical Safety\"],\"sameAs\":\"https:\/\/pabau.com\/blog\/author\/vanja\/\"},\"datePublished\":\"2026-08-18\",\"dateModified\":\"2026-08-18\"}<\/script>\n\n\n        <div id=\"key_takeaways\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/12\/Key-Takeaways-Icon.svg\" alt=\"Key takeaways\" height=\"42\" width=\"42\">\n                                <h3>Key takeaways<\/h3>\n            <\/div>\n            <div class=\"list\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>ICD-10 Code Q02 is the single billable diagnosis code for microcephaly, valid for FY2026 (effective October 1, 2025).<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Documentation must carry an objective head circumference more than 2 standard deviations below the mean for age and sex.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>The Tabular List adds an Excludes1 note for Meckel-Gruber syndrome and a code-first note for congenital Zika virus disease.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Q02 is exempt from Present on Admission reporting, so it never feeds hospital-acquired condition measures.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Practice management software like Pabau keeps the measurement, the etiology note, and the claim on one patient record.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">ICD-10 Code Q02: Definition, validity, and billable status<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code Q02 is the billable ICD-10-CM diagnosis code for microcephaly. It is valid for fiscal year 2026, and that edition took effect on October 1, 2025. According to the <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD-10 codes page<\/a>, Q02 is a specific, terminal code with no subcategory codes beneath it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">One measurement drives the assignment. The record needs an objective head circumference more than 2 standard deviations below the mean for the child&#8217;s age and sex. <a href=\"https:\/\/pabau.com\/features\/claims-management-software\/\">Claims management software<\/a> pulls the claim from the same record that holds that measurement.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/diagnostic_codes\/icd-10-code-q02\/automate-claims-through-healthcode.webp\" alt=\"Automate claims and billing with Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau submits and tracks Q02 claims from the same patient record that already holds the measurement evidence.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Field<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Detail<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q02<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Microcephaly<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code type<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Billable \/ Specific<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY edition<\/td>\n<td style=\"padding:12px 16px;color:#374151\">FY2026 (effective October 1, 2025)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Chapter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA0)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Block<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q00-Q07: Congenital malformations of the nervous system<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">POA exemption<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes, exempt from Present on Admission reporting<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Subcategory codes<\/td>\n<td style=\"padding:12px 16px;color:#374151\">None (terminal billable code)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\">\n<div class=\"wp-block-embed__wrapper\">\n<iframe title=\"ICD-10 Revisions: Stay Updated or Fall Behind\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/bqAyb-BCA0w?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div>\n<\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Code classification and chapter context<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Q02 sits in a narrow corner of the ICD-10-CM hierarchy. Knowing where it falls helps coders pick sibling codes correctly when a patient presents with overlapping congenital conditions.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Hierarchy level<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code range<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Chapter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q00-QA0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Block<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q00-Q07<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Congenital malformations of the nervous system<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Category<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q02<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Microcephaly (terminal billable code)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">FY2026 extended Chapter 17 to Q00-QA0 and added the new QA0 category for genetic disorders. Chapter 17 codes are sequenced as principal diagnosis when the congenital condition is the reason for the encounter. They move to a secondary position when they are a contributing comorbidity.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Clinical description of microcephaly<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Microcephaly is a condition in which the head circumference is significantly smaller than expected for a child&#8217;s age and sex. The threshold that drives Q02 is a measurement more than 2 standard deviations below the mean. The <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM tool<\/a> carries the same criteria.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The condition may be primary, meaning brain development failed structurally, or secondary, meaning it was acquired. Etiology matters for coding, because some causes require an additional code alongside Q02.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Primary microcephaly:<\/strong> Genetic or chromosomal origin, where the reduced brain size is the primary structural event.<\/li><li><strong>Secondary microcephaly:<\/strong> Caused by a postnatal insult such as hypoxia, infection, or metabolic disease affecting brain growth after birth.<\/li><li><strong>Congenital infection-related:<\/strong> Zika virus infection during pregnancy is a documented cause. The Tabular List instructs you to code first congenital Zika virus disease (P35.4), if applicable.<\/li><li><strong>Chromosomal association:<\/strong> Microcephaly may appear alongside trisomy conditions, and dual-coding scenarios need a sequencing review against the official guidelines.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Associated findings such as intellectual disability or seizure disorders are common, and each one carries its own ICD-10-CM code. Practices that follow these children through years of therapy often run their notes and scheduling in <a href=\"https:\/\/pabau.com\/industry\/speech-therapy-software\/\">speech therapy software<\/a> built for repeat developmental visits.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Inclusion terms and synonyms<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Two terms sit under the Includes note for Q02. When either one appears in physician documentation, Q02 is the correct code assignment.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Inclusion term<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Clinical notes<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Hydromicrocephaly<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Microcephaly presenting with excess intracranial fluid. Q02 still applies unless hydrocephalus is the primary diagnosis, which is coded to Q03.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Micrencephalon<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Also written micrencephaly. Describes reduced brain volume and maps directly to Q02.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Both terms come from the Includes note in the ICD-10-CM Tabular List, which is an instructional note rather than an Alphabetical Index entry. If the documentation says micrencephaly or micrencephalon, the code assignment is the same. There is no separate code to go looking for.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Exclusion notes and codes that look similar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Q02 carries two instructional notes in the Tabular List. Reading both before you finalize the code prevents the rejections that follow a wrong assignment.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Excludes1: Meckel-Gruber syndrome<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The Excludes1 note under Q02 lists Meckel-Gruber syndrome, coded to Q61.9. Excludes1 means the two codes are never reported together for the same patient. When the record confirms Meckel-Gruber syndrome, report Q61.9 and leave Q02 off the claim.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Code first: congenital Zika virus disease<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Q02 also carries a code-first instruction. Where congenital Zika virus disease is documented, sequence P35.4 ahead of Q02. The note applies to any encounter where that diagnosis is in the record.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Codes commonly confused with Q02<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The codes below are not part of the Excludes1 note. They are the ones coders reach for by mistake, so the distinction is worth holding in mind at assignment.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Condition<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Correct code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Why it differs from Q02<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Anencephaly<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q00.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Absence of major brain portions, rather than a small head circumference.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Congenital hydrocephalus<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q03<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Enlarged head caused by CSF accumulation, the opposite presentation to microcephaly.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Trisomy 21 (Down syndrome)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q90.x<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A chromosomal condition. Q02 may be coded additionally when microcephaly is separately documented and clinically significant.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Other congenital brain malformations<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Q04.x<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Structural brain anomalies not characterized by head circumference below normal.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Sequencing is the other thing to settle here. When a chromosomal abnormality such as trisomy 21 is the documented primary cause, the official guidelines decide which code leads. Microcephaly listed as a manifestation does not automatically sequence first.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Documentation requirements for accurate Q02 coding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Missing one documentation element is enough for a Q02 claim to deny. Payers expect objective, measurement-based evidence in the encounter note, beyond the diagnostic label itself. <a href=\"https:\/\/pabau.com\/features\/patient-intake-software\/\">Digital clinical forms<\/a> built around these requirements capture the data at the point of care.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/diagnostic_codes\/icd-10-code-q02\/digital-forms.webp\" alt=\"Pabau digital clinical forms\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s digital forms put the head circumference, percentile, and reference chart fields in front of the clinician during the visit.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Objective head circumference measurement:<\/strong> The documented measurement must be more than 2 standard deviations below the mean for the child&#8217;s age and sex. Record the measurement in centimeters, the percentile, and the reference chart used, which is commonly the WHO growth standards.<\/li><li><strong>Age and sex of the patient:<\/strong> Both are needed to read the measurement against normative data. Missing either one is a basic documentation deficiency.<\/li><li><strong>Etiology, when known:<\/strong> Document whether the microcephaly is primary or secondary. Where a specific cause is identified, an additional code may be required.<\/li><li><strong>Associated neurological or developmental findings:<\/strong> Seizures, intellectual disability, motor delay, and visual impairment are common. Document each one as a separate, codeable condition with its own ICD-10-CM code.<\/li><li><strong>Clinical note language:<\/strong> Avoid subjective descriptors such as small head or appears microcephalic. Write instead: head circumference 42.5 cm, below the 3rd percentile, greater than 2 SD below the mean for age and sex, consistent with microcephaly.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Getting these fields into the note during the visit is what makes a <a href=\"https:\/\/pabau.com\/blog\/clean-claim\/\">clean claim<\/a> possible on the first pass. Structured <a href=\"https:\/\/pabau.com\/blog\/medical-forms-at-your-healthcare-practice\/\">medical forms<\/a> that pre-populate the fields reduce the risk of an incomplete encounter.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau&#8217;s <a href=\"https:\/\/pabau.com\/features\/medical-records-management\/\">structured patient records<\/a> let clinicians capture head circumference, growth chart data, and developmental findings inside one encounter note. That keeps the billing team from rebuilding the story after the visit has closed.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/diagnostic_codes\/icd-10-code-q02\/comprehensive-patient-records.webp\" alt=\"Comprehensive patient records in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s patient records hold every growth measurement and developmental finding in one timeline, so nobody hunts for the evidence at claim time.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n        <div id=\"pro_tip\">\n            <div class=\"img\">\n                <svg width=\"42\" height=\"42\" viewBox=\"0 0 42 42\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M12.6383 19.5238C12.6632 21.2071 12.8734 22.9926 12.0685 24.5523C11.0341 26.8917 8.45076 28.169 7.56292 30.5918C6.63082 33.1061 7.19505 36.185 9.31371 37.9786C10.929 39.5678 13.4183 39.9873 15.6061 39.5463C17.4592 39.073 19.1049 37.8388 19.9706 36.1608C20.781 34.7141 20.7866 32.9904 20.5293 31.3985C20.1006 29.3092 18.3775 27.8705 16.9807 26.362C14.8814 24.1005 14.6684 20.6854 15.595 17.8915C16.4331 15.4768 19.0026 14.2344 20.0425 11.9461C20.7202 10.6769 20.7506 9.20327 20.6068 7.81304C20.1864 5.40098 18.3139 3.23631 15.8716 2.56674C13.9742 2.03969 11.8224 2.30052 10.1739 3.37614C8.70522 4.34688 7.5878 5.86618 7.28356 7.58178C6.76081 9.82981 7.53525 12.2822 9.20307 13.9118C10.7658 15.4741 12.4806 17.2273 12.6383 19.5238Z\"\n                        fill=\"#2BADD4\" \/>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M22.7048 19.8387C22.6822 22.3279 24.4507 24.6234 26.7493 25.4682C28.0531 25.961 29.4725 25.9183 30.7989 25.5487C32.0575 24.9955 33.301 24.2237 34.0069 23.0092C34.8384 21.5811 35.2982 19.8286 34.7832 18.2094C34.3611 16.2507 32.8739 14.6541 31.0275 13.9426C28.6736 12.9595 25.8073 13.7942 24.1719 15.7001C23.2022 16.8366 22.6143 18.3326 22.7048 19.8387Z\"\n                        fill=\"#2BADD4\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"text\">\n                <h3>Pro Tip<\/h3>\n                <p>Document the specific percentile and reference chart used alongside the raw head circumference measurement. Payers increasingly want the normative reference too, for example the WHO 2006 growth standards. It validates the 2 SD threshold in a way the bare measurement cannot.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">Coding guidelines and common pitfalls<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM Official Guidelines for Coding and Reporting govern every Q02 assignment. A handful of patterns produce most of the claim errors and audit findings in microcephaly coding.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Coding without an objective measurement:<\/strong> Assigning Q02 on a clinical impression alone, with no documented head circumference, fails the specificity standard. The measurement has to be in the record.<\/li><li><strong>Ignoring sequencing rules with chromosomal codes:<\/strong> When a chromosomal abnormality is the principal diagnosis, sequencing Q02 first is an error. Check the Chapter 17 guidelines for sequencing priority.<\/li><li><strong>Missing the Zika code-first note:<\/strong> The Tabular List instructs you to code first congenital Zika virus disease (P35.4), if applicable. Sequence P35.4 ahead of Q02 whenever that diagnosis is documented.<\/li><li><strong>Confusing micrencephaly with anencephaly:<\/strong> Micrencephaly is an inclusion term under Q02, while anencephaly is a separate code at Q00.0. Use the <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC ICD-10-CM lookup<\/a> to confirm the routing when documentation is ambiguous.<\/li><li><strong>Skipping associated condition codes:<\/strong> Q02 does not capture a co-occurring seizure disorder, intellectual disability, or developmental delay. Each one is coded separately.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When a Q02 claim comes back rejected, the remittance advice names the reason. Reading the <a href=\"https:\/\/pabau.com\/blog\/denial-codes-in-medical-billing\/\">denial codes<\/a> tells you whether the problem was the measurement or the sequencing, which decides how you rework it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Related and differential diagnosis codes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The codes below cover the differential. Use them when microcephaly is suspected but not confirmed, or when a different congenital nervous system condition turns out to be the diagnosis.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Key distinction from Q02<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Q00.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Anencephaly<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Absence of brain and skull, and incompatible with life beyond birth in most cases.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Q00.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Craniorachischisis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Combined anencephaly and open spinal defect, a distinct neural tube defect.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Q03<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Congenital hydrocephalus<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Excess CSF causing an enlarged head, the opposite of microcephaly.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Q04.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Congenital malformations of corpus callosum<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A structural brain anomaly. Head circumference may or may not be affected.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Q04.3<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other reduction deformities of brain<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Includes lissencephaly and agyria, where brain structure is reduced without a measurable change in head circumference.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Q07.00<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Arnold-Chiari malformation without spina bifida or hydrocephalus<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Hindbrain herniation, where head size is not the defining criterion.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/www.cms.gov\/medicare\/coordination-benefits-recovery\/overview\/icd-code-lists\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD Code Lists<\/a> carry the full valid and excluded code list for coordination of benefits. That matters when a microcephaly patient is seen by several specialties or covered by more than one payer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">CPT codes commonly billed with microcephaly encounters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Q02 is a diagnosis code. The evaluations and procedures performed during a microcephaly encounter are reported with CPT codes, and the table below covers the usual pairings.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">CPT code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Clinical context<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">99213-99215<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Established patient office or outpatient E\/M<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Follow-up neurology or pediatrics visit. The level is set by medical decision making or time.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">99202-99205<\/td>\n<td style=\"padding:12px 16px;color:#374151\">New patient office or outpatient E\/M<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Initial neurology or genetics workup for newly diagnosed microcephaly.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">96110<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Developmental screening<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A standardized screening tool such as the ASQ-3, administered at the visit and commonly billed with Q02.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">96112-96113<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Developmental test administration<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Formal developmental assessment once screening is positive. Code 96116 covers a neurobehavioral status exam and is reported separately.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">81400-81479<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Molecular pathology and genetic testing<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The specific test is selected by the genetics team, and pairs with Q02 when the genetic workup is the primary service.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">70553<\/td>\n<td style=\"padding:12px 16px;color:#374151\">MRI brain without and with contrast<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Neuroimaging to characterize structural brain abnormalities in microcephaly.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Verify current pairings against the AMA CPT edition in use for the billing year, since descriptors change annually. The <a href=\"https:\/\/www.aapc.com\/codify\/icd-10-crosswalk.aspx\" target=\"_blank\" rel=\"nofollow noopener\">AAPC CPT-to-ICD-10 crosswalk<\/a> is a useful way to confirm medical necessity linkage between the procedure and Q02.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Present on admission status<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Q02 is exempt from the Present on Admission (POA) reporting requirement. Microcephaly is a congenital condition, so it is present at the time of inpatient admission by definition. Inpatient coders do not report a POA indicator for Q02.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That exemption has a billing consequence. POA-exempt codes do not feed hospital-acquired condition measures or the payment adjustments attached to them. Consistent flagging of POA-exempt congenital conditions across encounters is also what a <a href=\"https:\/\/pabau.com\/blog\/medical-billing-compliance\/\">medical billing compliance<\/a> review looks for, alongside <a href=\"https:\/\/pabau.com\/blog\/hipaa-compliance-for-medical-offices\/\">HIPAA-compliant documentation<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Note structure and billing tips for microcephaly encounters<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Clean Q02 submission depends as much on how the encounter note reads as on the code itself. The habits below keep a claim moving on the first pass instead of into a rework queue.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>EHR note structure for Q02 encounters:<\/strong> Put the Q02 diagnosis in the assessment section with the measurement evidence sitting next to it.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Impression: microcephaly (Q02). Head circumference 42.5 cm at 18 months, below the 3rd percentile and greater than 2 SD below the mean per WHO 2006 standards. Etiology under investigation. Genetics referral placed.<\/em><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A note written that way passes audit review without a coder query.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Separate associated conditions:<\/strong> Assign individual ICD-10-CM codes for seizures (G40.x), intellectual disability (F70-F79), or developmental delay (F88) documented in the same encounter. Bundling them under Q02 is a sequencing error.<\/li><li><strong>Etiology code decisions:<\/strong> Where a specific genetic syndrome is driving the microcephaly, sequence the genetic code first only when it is the principal diagnosis. If microcephaly is the reason for the visit, Q02 leads.<\/li><li><strong>Common denial reason and fix:<\/strong> Payers ask for medical necessity documentation. The fix is making sure the encounter note carries the measurement and the clinical rationale. Attach growth chart data where the payer portal allows it.<\/li><li><strong>Telehealth encounters:<\/strong> Microcephaly management visits can run by telehealth after the initial in-person assessment. Q02 is assignable to telehealth claims, with the telehealth modifier appended per payer requirements.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Motor delay pulls many of these children into weekly therapy. Practices that run those visits in <a href=\"https:\/\/pabau.com\/industry\/physical-therapy-emr\/\">physical therapy software<\/a> keep every session note on the record the claim is built from.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pabau.com\/features\/ai-medical-scribe\/\">Pabau Scribe<\/a>, our AI scribe, captures structured note content during the consultation, so the measurement does not go missing from the assessment. For practices carrying a high volume of pediatric congenital cases, <a href=\"https:\/\/pabau.com\/blog\/practice-management-software\/\">practice management tools<\/a> that join coding workflow to clinical notes cut rework at submission.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/diagnostic_codes\/icd-10-code-q02\/creating-treatment-notes-with-echo-ai.webp\" alt=\"Creating treatment notes with Pabau Scribe\"\/><figcaption class=\"wp-element-caption\"><em>Pabau Scribe drafts the treatment note during the visit, so the head circumference reading lands in the assessment section.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n        <div id=\"pro_tip\">\n            <div class=\"img\">\n                <svg width=\"42\" height=\"42\" viewBox=\"0 0 42 42\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M12.6383 19.5238C12.6632 21.2071 12.8734 22.9926 12.0685 24.5523C11.0341 26.8917 8.45076 28.169 7.56292 30.5918C6.63082 33.1061 7.19505 36.185 9.31371 37.9786C10.929 39.5678 13.4183 39.9873 15.6061 39.5463C17.4592 39.073 19.1049 37.8388 19.9706 36.1608C20.781 34.7141 20.7866 32.9904 20.5293 31.3985C20.1006 29.3092 18.3775 27.8705 16.9807 26.362C14.8814 24.1005 14.6684 20.6854 15.595 17.8915C16.4331 15.4768 19.0026 14.2344 20.0425 11.9461C20.7202 10.6769 20.7506 9.20327 20.6068 7.81304C20.1864 5.40098 18.3139 3.23631 15.8716 2.56674C13.9742 2.03969 11.8224 2.30052 10.1739 3.37614C8.70522 4.34688 7.5878 5.86618 7.28356 7.58178C6.76081 9.82981 7.53525 12.2822 9.20307 13.9118C10.7658 15.4741 12.4806 17.2273 12.6383 19.5238Z\"\n                        fill=\"#2BADD4\" \/>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M22.7048 19.8387C22.6822 22.3279 24.4507 24.6234 26.7493 25.4682C28.0531 25.961 29.4725 25.9183 30.7989 25.5487C32.0575 24.9955 33.301 24.2237 34.0069 23.0092C34.8384 21.5811 35.2982 19.8286 34.7832 18.2094C34.3611 16.2507 32.8739 14.6541 31.0275 13.9426C28.6736 12.9595 25.8073 13.7942 24.1719 15.7001C23.2022 16.8366 22.6143 18.3326 22.7048 19.8387Z\"\n                        fill=\"#2BADD4\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"text\">\n                <h3>Pro Tip<\/h3>\n                <p>Run a quarterly audit on Q02 claims and filter for denials citing missing documentation or medical necessity. In most practices the fix is a single template update. Add the head circumference field and the growth chart reference to the neurology or pediatrics encounter note. Make both required fields before sign-off.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">How Pabau supports microcephaly documentation and clean claims<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In most practices this work is split across three systems. The growth chart lives in one place, the encounter note in another, and the claim in a third. Every hand-off is a chance for the head circumference to fall out of the record.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Practice management software like Pabau holds them together. <a href=\"https:\/\/pabau.com\/features\/measurements-tracking-software\/\">Measurements tracking<\/a> stores each head circumference reading against the patient&#8217;s timeline, so growth across months reads in one view. The encounter note, the consent, and the claim all draw on that same record.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For a billing team, the outcome is fewer queries to chase. When a payer asks what supports the Q02 line, the measurement is already in the chart, dated and set against its growth reference. Nobody has to reopen the visit to find it.<\/p>\n\n\n        <div id=\"book_a_demo\">\n            <div class=\"left-side\">\n                <div class=\"logo\">\n                    <img decoding=\"async\"\n                        src=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/01\/Logo.svg\"\n                        alt=\"Logo\"\n                        loading=\"lazy\"\n                    \/>\n                <\/div>\n\n                <h3 class=\"heading\">\n                    Keep Q02 measurements and claims on one record                <\/h3>\n\n                <p class=\"description\">\n                    Pabau stores growth measurements, encounter notes, and claims against the same patient record. Billing teams find the evidence a payer asks for without reopening the visit.                <\/p>\n\n                <div class=\"button-group\">\n                    <a href=\"\/book-demo\/\" class=\"btn btn-scale-effect btn-cta-color btn-md\">\n                        <span class=\"btn-text\">Book a demo<\/span>\n                        <div class=\"btn-icon btn-icon-right\" aria-hidden=\"true\">\n                            <svg\n                                width=\"14\"\n                                height=\"12\"\n                                viewBox=\"0 0 14 12\"\n                                fill=\"none\"\n                                xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n                            >\n                                <path\n                                    d=\"M0.75 4.77295C0.335786 4.77295 0 5.10874 0 5.52295C0 5.93716 0.335786 6.27295 0.75 6.27295V5.52295V4.77295ZM13.2803 6.05328C13.5732 5.76039 13.5732 5.28551 13.2803 4.99262L8.50736 0.219648C8.21447 -0.073245 7.73959 -0.073245 7.4467 0.219648C7.15381 0.512542 7.15381 0.987415 7.4467 1.28031L11.6893 5.52295L7.4467 9.76559C7.15381 10.0585 7.15381 10.5334 7.4467 10.8263C7.73959 11.1191 8.21447 11.1191 8.50736 10.8263L13.2803 6.05328ZM0.75 5.52295V6.27295L12.75 6.27295V5.52295V4.77295L0.75 4.77295V5.52295Z\"\n                                    fill=\"currentColor\"\n                                ><\/path>\n                            <\/svg>\n                        <\/div>\n                    <\/a>\n                <\/div>\n            <\/div>\n\n            <div class=\"right-side\">\n                <img decoding=\"async\"\n                    src=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/01\/Home-Page-Concept-4.webp\"\n                    alt=\"Pabau clinical documentation and claims management dashboard\"\n                    loading=\"lazy\"\n                \/>\n            <\/div>\n        <\/div>\n        \n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Q02 has no subcategories, so choosing the code takes seconds. Everything that decides whether it pays sits in the note written before the claim goes out.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Set the encounter template up once. Make head circumference, percentile, and growth reference required fields before sign-off, and put the etiology prompt underneath them. After that, a clean Q02 claim becomes the default rather than a rescue job.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pabau.com\/book-demo\/\">Book a demo<\/a> to see how Pabau keeps measurement evidence and Q02 claims on the same patient record.<\/p>\n\n\n        <div id=\"expert_picks\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/11\/Expert-Picks.svg\" alt=\"Continue your research\" height=\"42\" width=\"42\">\n                                <h3>Continue your research<\/h3>\n            <\/div>\n            <div class=\"content\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Working a rejected claim?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/denial-management-in-healthcare\/\">Denial management in healthcare<\/a> walks through reworking and resubmitting a denial without losing the filing window.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Want the claim right on the first pass?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/insurance-eligibility-verification\/\">Insurance eligibility verification<\/a> covers the checks that belong before the patient arrives.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Not sure how long you have to file?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/timely-filing-limits\/\">Timely filing limits<\/a> lists the deadlines by payer and what happens when one passes.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Waiting on approval for imaging or genetic testing?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/prior-authorization-process\/\">Prior authorization process<\/a> explains how to get a request through the first time.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1786962836253\"><h3 class=\"schema-faq-question\">What is ICD-10 Code Q02?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code Q02 is the billable ICD-10-CM diagnosis code for microcephaly. Microcephaly is a congenital condition where the head circumference is significantly smaller than expected for a child&#8217;s age and sex. Q02 falls under Chapter 17 (Q00-QA0) and is valid for FY2026, effective October 1, 2025.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836254\"><h3 class=\"schema-faq-question\">Is Q02 a billable ICD-10 code?<\/h3> <p class=\"schema-faq-answer\">Yes, Q02 is a specific, billable ICD-10-CM code. It is a terminal code with no subcategory codes beneath it, meaning it can be used directly on claims for reimbursement without further specificity.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836255\"><h3 class=\"schema-faq-question\">What documentation is required to assign code Q02?<\/h3> <p class=\"schema-faq-answer\">Documentation must include an objective head circumference more than 2 standard deviations below the mean for the child&#8217;s age and sex. Record the measurement in centimeters, the percentile, the reference chart used, and the etiology when it is known. Associated neurological findings are documented and coded separately.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836256\"><h3 class=\"schema-faq-question\">What are the inclusion terms under ICD-10 Code Q02?<\/h3> <p class=\"schema-faq-answer\">The Includes note under Q02 lists hydromicrocephaly and micrencephalon, also written micrencephaly. When either term appears in physician documentation, Q02 is the correct assignment. That note sits in the Tabular List rather than the Alphabetical Index.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836257\"><h3 class=\"schema-faq-question\">Is Q02 exempt from the Present on Admission requirement?<\/h3> <p class=\"schema-faq-answer\">Yes, Q02 is exempt from the Present on Admission (POA) reporting requirement. Microcephaly is a congenital condition, so it is always present at the time of inpatient admission. Inpatient coders do not assign a POA indicator for this code.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836258\"><h3 class=\"schema-faq-question\">What CPT codes are commonly billed with Q02?<\/h3> <p class=\"schema-faq-answer\">Office E\/M codes are the most common pairing, 99202-99205 for new patients and 99213-99215 for established patients. Developmental screening is 96110, and developmental test administration is 96112-96113. Genetic testing sits in the 81400-81479 range, and MRI brain without and with contrast is 70553. Verify current pairings against the AMA CPT edition for the billing year.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836259\"><h3 class=\"schema-faq-question\">How does Q02 differ from Q03 (congenital hydrocephalus)?<\/h3> <p class=\"schema-faq-answer\">Q02 codes for microcephaly, where the head is abnormally small due to reduced brain growth. Q03 codes for congenital hydrocephalus, where the head is enlarged due to excess cerebrospinal fluid. They are opposite presentations and cannot be used interchangeably, though they occasionally co-exist in complex cases requiring dual coding.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836260\"><h3 class=\"schema-faq-question\">Does Q02 carry an Excludes1 note?<\/h3> <p class=\"schema-faq-answer\">Yes. The Excludes1 note under Q02 lists Meckel-Gruber syndrome, which is coded to Q61.9. Excludes1 means the two codes are never reported together. When Meckel-Gruber syndrome is documented, report Q61.9 and leave Q02 off the claim.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786962836261\"><h3 class=\"schema-faq-question\">How do you code microcephaly caused by congenital Zika virus?<\/h3> <p class=\"schema-faq-answer\">Sequence P35.4 first, then Q02. The Tabular List carries a code-first note under Q02 for congenital Zika virus disease. That order applies whenever the Zika diagnosis appears in the record.<\/p> <\/div> <\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>ICD-10 Code Q02: Definition, validity, and billable status ICD-10 Code Q02 is the billable ICD-10-CM diagnosis code for microcephaly. It is valid for fiscal year 2026, and that edition took effect on October 1, 2025. According to the CMS ICD-10 codes page, Q02 is a specific, terminal code with no subcategory codes beneath it. One [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":181274,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"","_yoast_wpseo_content_score":"90","_yoast_wpseo_is_cornerstone":"","_yoast_wpseo_keywordsynonyms":"[\"\",\"\",\"\",\"\",\"\"]","_yoast_wpseo_focuskw_text_input":"","_seo_original_html":"","footnotes":""},"categories":[1549,1550],"tags":[1837,1680,1363,2689,2696,3738],"class_list":["post-181276","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm","tag-developmental-disability-coding","tag-diagnostic-codes","tag-icd-10","tag-neurological-coding","tag-neurological-diagnosis-codes","tag-pediatric-coding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ICD-10 Code Q02: Microcephaly coding and documentation (FY2026)<\/title>\n<meta name=\"description\" content=\"Q02 is the billable ICD-10 code for microcephaly. 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Assign it from a head circumference more than 2 SD below the mean for age and sex.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-q02\/\" \/>\n<meta property=\"og:site_name\" content=\"Pabau\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Pabau\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-18T08:00:14+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-18T08:20:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/08\/icd-10-code-q02.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Despina Petrushevska\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:site\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:label1\" content=\"Geschreven door\" \/>\n\t<meta name=\"twitter:data1\" content=\"Despina Petrushevska\" \/>\n\t<meta name=\"twitter:label2\" content=\"Geschatte leestijd\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuut\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/\"},\"author\":{\"name\":\"Despina Petrushevska\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#\\\/schema\\\/person\\\/80e6d36732fad68140a849f3c351449b\"},\"headline\":\"ICD-10 Code Q02: Microcephaly diagnosis, coding, and documentation\",\"datePublished\":\"2026-08-18T08:00:14+00:00\",\"dateModified\":\"2026-08-18T08:20:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/\"},\"wordCount\":2809,\"publisher\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/icd-10-code-q02.webp\",\"keywords\":[\"Developmental disability coding\",\"Diagnostic codes\",\"ICD-10\",\"Neurological coding\",\"Neurological diagnosis codes\",\"Pediatric coding\"],\"articleSection\":[\"Diagnostic Codes\",\"ICD-10-CM\"],\"inLanguage\":\"nl-NL\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/\",\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/\",\"name\":\"ICD-10 Code Q02: Microcephaly coding and documentation (FY2026)\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/icd-10-code-q02.webp\",\"datePublished\":\"2026-08-18T08:00:14+00:00\",\"dateModified\":\"2026-08-18T08:20:02+00:00\",\"description\":\"Q02 is the billable ICD-10 code for microcephaly. 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Outside of work, she enjoys photography, weekend getaways, and finding inspiration in everyday experiences.\",\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/blog\\\/author\\\/despina-petrushevska\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/#faq-question-1786962836253\",\"position\":1,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/diagnostic-codes\\\/icd-10-code-q02\\\/#faq-question-1786962836253\",\"name\":\"What is ICD-10 Code Q02?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"ICD-10 Code Q02 is the billable ICD-10-CM diagnosis code for microcephaly. Microcephaly is a congenital condition where the head circumference is significantly smaller than expected for a child's age and sex. 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Q02 falls under Chapter 17 (Q00-QA0) and is valid for FY2026, effective October 1, 2025.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-q02\/#faq-question-1786962836254","position":2,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-q02\/#faq-question-1786962836254","name":"Is Q02 a billable ICD-10 code?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes, Q02 is a specific, billable ICD-10-CM code. 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Associated neurological findings are documented and coded separately.","inLanguage":"nl-NL"},"inLanguage":"nl-NL"},{"@type":"Question","@id":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-q02\/#faq-question-1786962836256","position":4,"url":"https:\/\/pabau.com\/nl\/diagnostic-codes\/icd-10-code-q02\/#faq-question-1786962836256","name":"What are the inclusion terms under ICD-10 Code Q02?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The Includes note under Q02 lists hydromicrocephaly and micrencephalon, also written micrencephaly. When either term appears in physician documentation, Q02 is the correct assignment. 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