{"id":154161,"date":"2026-07-14T14:22:33","date_gmt":"2026-07-14T14:22:33","guid":{"rendered":"https:\/\/pabau.com\/?p=154161"},"modified":"2026-08-17T12:08:06","modified_gmt":"2026-08-17T12:08:06","slug":"icd-10-code-b64","status":"publish","type":"post","link":"https:\/\/pabau.com\/fr\/diagnostic-codes\/icd-10-code-b64\/","title":{"rendered":"ICD-10 Code B64: Unspecified protozoal disease (FY2026)"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code B64: Unspecified protozoal disease\",\"description\":\"ICD-10 Code B64 (Unspecified protozoal disease) is a valid billable diagnosis code for FY2026. This reference covers code details, synonyms, hierarchy, clinical use, MS-DRG mapping, and when to use B64 vs more specific protozoal codes.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-b64\/\",\"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\":\"2026-07-07\",\"dateModified\":\"2026-07-14\"}<\/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 B64 is a valid, billable diagnosis code for unspecified protozoal disease, covering cases where the causative organism cannot be identified.<\/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>B64 is valid for fiscal year 2026 (October 1, 2025 through September 30, 2026) and is accepted in all HIPAA-covered transactions.<\/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>Always use a more specific protozoal disease code (B50-B63) when the causative organism is known &#8211; B64 is the correct fallback only when no specific organism can be documented.<\/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>Pabau&rsquo;s claims management software supports accurate ICD-10-CM diagnosis recording and HIPAA-compliant billing workflows for codes including B64.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">ICD-10 Code B64: Definition, billable status, and FY2026 validity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code B64 is the billable ICD-10-CM code for unspecified protozoal disease. It applies when a protozoal infection is confirmed but the causative organism has not been identified or documented. Most protozoal infections resolve to a known organism instead, so B64 is a fallback, not a default.<\/p>\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<p class=\"wp-block-paragraph\">B64 is included in the 2026 edition of ICD-10-CM and can be used in all HIPAA-covered transactions from October 1, 2025 through September 30, 2026. According to the <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM web tool<\/a>, B64 sits at the terminus of the B50-B64 protozoal diseases block within Chapter 1 (Certain infectious and parasitic diseases, A00-B99). It carries no child codes, meaning it is a terminal billable code, not a category header.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Clinicians and coders searching for guidance on HIPAA-compliant diagnosis documentation should note that B64 applies only when the responsible protozoan organism has not been identified or documented. When the organism is known, a more specific code from B50 through B63 must be used instead. This reference covers every element coders need: hierarchy, synonyms, clinical application, MS-DRG mapping, and a decision table for selecting B64 versus its more specific alternatives.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">B64 code at a glance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The table below consolidates the key reference data for ICD-10 Code B64 in a single view. Use this for quick verification before submitting claims or documenting diagnoses.<\/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\">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\">Details<\/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\">ICD-10-CM Code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B64<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Full Description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unspecified protozoal disease<\/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 (terminal code &#8211; no sub-codes)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Chapter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Chapter 1: Certain infectious and parasitic diseases (A00-B99)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Block \/ Range<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B50-B64: Protozoal diseases<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Fiscal Year Validity<\/td>\n<td style=\"padding:12px 16px;color:#374151\">FY2026: October 1, 2025 through September 30, 2026<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">HIPAA Status<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Valid for all HIPAA-covered transactions<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">WHO ICD-10 Reference<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Listed in WHO ICD-10 Version 2019<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Child 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<h2 class=\"wp-block-heading\">Where B64 fits in the ICD-10-CM hierarchy<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Understanding the protozoal disease ICD-10 hierarchy helps coders verify they are using B64 correctly, not skipping over a more specific code that should apply. B64 is the final code in its block, sitting at the bottom of this structure:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Chapter 1:<\/strong> Certain infectious and parasitic diseases (A00-B99)<\/li><li><strong>Block B50-B64:<\/strong> Protozoal diseases<\/li><li><strong>B50-B54:<\/strong> Malaria (Plasmodium species)<\/li><li><strong>B55:<\/strong> Leishmaniasis (Leishmania species)<\/li><li><strong>B56-B57:<\/strong> Trypanosomiasis (African sleeping sickness, Chagas disease)<\/li><li><strong>B58:<\/strong> Toxoplasmosis (Toxoplasma gondii)<\/li><li><strong>B59:<\/strong> Pneumocystosis (Pneumocystis jiroveci)<\/li><li><strong>B60:<\/strong> Other protozoal diseases, not elsewhere classified (includes Babesiosis, Acanthamoebiasis, Naegleria infections)<\/li><li><strong>B64:<\/strong> Unspecified protozoal disease (NOS &#8211; no organism identified)<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Note that B61, B62, and B63 do not exist in the ICD-10-CM tabular list &#8211; B60 jumps directly to B64. Coders should also note that A07.2 (Cryptosporidiosis) falls outside the B50-B64 block, under intestinal protozoan diseases in the A00-A09 range. This matters when a patient presents with cryptosporidial infection: the correct code is A07.2, not a code from the B50-B64 block. Amebiasis &#8211; the intestinal infection caused by <em>Entamoeba histolytica<\/em> &#8211; is likewise classified under A06, outside the B50-B64 protozoal diseases block, so it is never coded to B64. Coders documenting multi-diagnosis claims should apply the same block-boundary logic to unrelated chapters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The <a href=\"https:\/\/icd.who.int\/browse10\/2019\/en\" target=\"_blank\" rel=\"nofollow noopener\">WHO ICD-10 browser<\/a> confirms B64&rsquo;s position in the international classification, where it carries the same description: unspecified protozoal disease. The ICD-10-CM version (used in the United States) mirrors this structure with clinical modifications for U.S. payer requirements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Approximate synonyms for B64<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM alphabetical index recognizes several alternative terms that route coders to B64. Knowing these synonyms helps during chart review when clinical documentation uses non-standard language.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Protozoal disease, unspecified<\/li><li>Protozoal infection NOS (Not Otherwise Specified)<\/li><li>Protozoal disease NOS<\/li><li>Unspecified protozoal infection<\/li><li>Protozoosis, unspecified<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The designation \u00ab\u00a0NOS\u00a0\u00bb is key. In ICD-10-CM coding, NOS indicates that the documentation does not provide enough information to assign a more specific code. For B64, NOS means the clinical record does not identify which protozoan organism caused the infection. This is clinically distinct from \u00ab\u00a0not yet confirmed\u00a0\u00bb &#8211; if testing is pending, coders should use symptoms or signs codes rather than B64, and revisit once the organism is confirmed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Coders working with practices that handle high volumes of infectious disease documentation may find structured clinical documentation tools helpful for capturing the organism detail needed to avoid reaching for unspecified codes unnecessarily.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Clinical information: What conditions map to B64?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Protozoa are single-celled organisms that can infect humans through various routes: insect bites, contaminated water, direct contact, and food consumption. Many of these infections surface after international travel. Most pathogenic protozoa have specific ICD-10-CM codes. B64 applies only in the residual scenario: protozoal infection is clinically suspected or confirmed, but the specific organism is not documented and cannot be identified from the available record.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Common protozoa that have their own specific codes include:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Plasmodium species (malaria):<\/strong> B50 (Plasmodium falciparum), B51 (P. vivax), B52 (P. malariae), B53 (other specified malaria), B54 (unspecified malaria)<\/li><li><strong>Leishmania species:<\/strong> B55.0 (visceral leishmaniasis), B55.1 (cutaneous leishmaniasis), B55.2 (mucocutaneous leishmaniasis)<\/li><li><strong>Trypanosoma brucei \/ T. cruzi:<\/strong> B56 (African trypanosomiasis), B57 (Chagas disease)<\/li><li><strong>Toxoplasma gondii:<\/strong> B58 (toxoplasmosis, with sub-codes by organ involvement)<\/li><li><strong>Pneumocystis jiroveci:<\/strong> B59 (pneumocystosis)<\/li><li><strong>Babesia species, Acanthamoeba, Naegleria fowleri:<\/strong> B60 sub-codes<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">B64 is appropriate when the clinical record documents a protozoal infection without identifying any of the above organisms &#8211; for example, a returning traveler with a confirmed protozoal illness where species identification was unsuccessful or not pursued, or a patient with clinical and microscopic evidence of protozoal infection where organism typing is pending and the case is being closed. Practices with robust clinical record management that captures travel history, lab results, and organism identification reduce the frequency with which B64 needs to be applied.<\/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-b64\/comprehensive-emr-patient-record-management.webp\" alt=\"Comprehensive EMR &#038; patient record management\"\/><figcaption class=\"wp-element-caption\"><em>Comprehensive EMR &#038; patient record management<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">When to use B64 vs. a more specific protozoal disease code<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM coding principle is clear: code to the highest level of specificity supported by the documentation. B64 is appropriate only as a last resort after confirming that no more specific code applies. This call often falls first to primary care practices running <a href=\"https:\/\/pabau.com\/industry\/gp-clinic-software\/\">GP clinic software<\/a>, before a specialist referral confirms the causative organism. The table below maps the most common protozoal diseases to their specific codes, helping coders determine when B64 is and is not correct.<\/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\">Protozoal Disease \/ Organism<\/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\">Use B64 instead?<\/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\">Malaria (Plasmodium falciparum)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B50<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; B50 is 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\">Malaria (Plasmodium vivax)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B51<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; B51 is specific<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Malaria, species not confirmed<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B54 (unspecified malaria)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; B54 is more specific than B64 for malaria context<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Leishmaniasis (visceral)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B55.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; B55.0 is specific<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Trypanosomiasis (Chagas disease)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B57<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; B57 is 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\">Toxoplasmosis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B58 (with sub-codes by organ)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; B58 sub-codes are specific<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Cryptosporidiosis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A07.2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; A07.2 is specific (note: outside B50-B64 block)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Giardiasis<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A07.1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; A07.1 is specific (outside B50-B64 block)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Amebiasis (Entamoeba histolytica)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">A06.-<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; A06 is specific (outside B50-B64 block)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Protozoal infection, organism not identified or not documented<\/td>\n<td style=\"padding:12px 16px;color:#374151\">B64<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes &#8211; B64 is correct here<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Protozoal infection, testing pending (not yet confirmed)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Signs\/symptoms codes<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No &#8211; use symptom codes until confirmed; revisit when results available<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">A practical note: if the record documents that the patient \u00ab\u00a0has a protozoal infection\u00a0\u00bb without organism identification, and the case is being closed or billed, B64 is appropriate. If testing is still outstanding, coders should document signs and symptoms rather than B64, and update when results arrive. The same specificity check applies to I61.x codes for intraparenchymal hemorrhage, where site-specific documentation determines the correct code.<\/p>\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>Before assigning B64, ask one question: does the clinical record identify the causative organism or could it be matched to any code in B50-B63? If yes, use that code. B64 is a residual catch-all, not a shortcut. Document the clinical rationale for using an unspecified code in the patient record to support the claim if audited.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">Documentation requirements for B64<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Before submitting a claim with B64, the chart needs to support the unspecified code with more than a diagnosis statement. Auditors reviewing an unspecified code want to see why a more specific code wasn&rsquo;t available.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The clinical record should contain three things:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>An explicit statement that the organism was not identified.<\/strong> The note should state that the causative protozoan was not identified or documented, rather than leaving it to be inferred from silence.<\/li><li><strong>Evidence that organism testing was attempted or is pending.<\/strong> Lab orders, culture results, or a note that species identification wasn&rsquo;t pursued show the coder didn&rsquo;t skip a step that would have produced a specific code.<\/li><li><strong>The clinical rationale for closing the case as unspecified.<\/strong> A short note on why the case was coded and closed without organism identification &#8211; for example, the patient improved on empiric treatment before results returned &#8211; gives the claim something to point to if it&rsquo;s audited.<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Without these three elements, B64 looks like a shortcut rather than a residual code, which is exactly what payer audits flag. Coders reviewing a chart that&rsquo;s missing organism-testing evidence should query the provider before billing B64, rather than defaulting to it because no other code seems to fit.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">MS-DRG mapping for ICD-10 Code B64<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">For inpatient hospital billing, ICD-10-CM diagnosis codes map to Medicare Severity Diagnosis Related Groups (MS-DRGs), which determine reimbursement under the prospective payment system. According to the <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD-10-CM\/PCS MS-DRG Definitions Manual<\/a>, B64 maps to the following MS-DRGs when listed as the principal 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\">MS-DRG<\/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\">Complication \/ Comorbidity Level<\/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\">867<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other infectious and parasitic diseases diagnoses with MCC<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Major Complication or Comorbidity (MCC)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">868<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other infectious and parasitic diseases diagnoses with CC<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Complication or Comorbidity (CC)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">869<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other infectious and parasitic diseases diagnoses without CC\/MCC<\/td>\n<td style=\"padding:12px 16px;color:#374151\">No Complication or Comorbidity<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The actual MS-DRG assigned depends on the full claim: whether any secondary diagnoses qualify as CC or MCC conditions, and any procedures performed during the inpatient stay. MS-DRG groupings change annually with CMS updates, so always verify against the current CMS MS-DRG Definitions Manual version. The table above reflects the grouper logic consistent with MS-DRG v37.0+.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Billing teams that process inpatient claims should confirm their claims management workflows are updated to reflect the current fiscal year&rsquo;s MS-DRG grouper tables when coding infectious disease admissions.<\/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-b64\/automate-claims-through-healthcode.webp\" alt=\"Automate claims and billing with Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Automate claims and billing with Pabau<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Index references for B64<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The ICD-10-CM alphabetical index provides the lookup paths that direct coders from clinical terminology to B64. Coders looking up protozoal conditions in the index will find these entries pointing to B64:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>Disease, protozoal NOS:<\/strong> B64<\/li><li><strong>Infection, protozoan NOS:<\/strong> B64<\/li><li><strong>Protozoosis:<\/strong> B64<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">When the index entry for a condition routes to a more specific code within B50-B63, that code should always take precedence over B64. The NOS qualifier in the index indicates specifically that no further specification is available from the documentation. This convention isn&rsquo;t unique to B64 &#8211; codes like M18.9 use the same unspecified designation, and coders should treat any NOS entry as a signal to query the provider before defaulting to it.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Code history and annual updates<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">B64 has been part of the ICD-10-CM system since the code set was implemented for U.S. payers. The table below summarizes its revision history and current status.<\/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\">Fiscal Year<\/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\">Status<\/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\">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\">FY2016 (Oct 2015)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Active<\/td>\n<td style=\"padding:12px 16px;color:#374151\">First ICD-10-CM implementation year for U.S. payers<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY2017-FY2025<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Active, no revision<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Code description and hierarchy unchanged across editions<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY2026 (current)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Active, no revision<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Valid October 1, 2025 through September 30, 2026; no description or hierarchy changes<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">B64 has not been revised since ICD-10-CM implementation. It carries the same description, hierarchy position, and billable status it had at launch. Coders checking HIPAA-compliant coding requirements annually should verify status against the current ICD-10-CM tabular list each October, when new fiscal year editions take effect. The <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC ICD-10-CM code reference<\/a> updates annually and is a reliable secondary verification source alongside the CDC\/NCHS official tool.<\/p>\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>Check the CDC\/NCHS ICD-10-CM tabular list each October 1 to confirm your codes remain active for the new fiscal year. B64 has been stable since FY2016, but annual verification is still best practice for any code you bill regularly.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 class=\"wp-block-heading\">Related ICD-10 codes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-a91\/\">ICD-10 code A91 \u2014 Dengue hemorrhagic fever<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-b72\/\">ICD-10 code B72 \u2014 Dracunculiasis<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-b75\/\">ICD-10 code B75 \u2014 Trichinellosis diagnosis and<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-b79\/\">ICD-10 code B79 \u2014 Trichuriasis diagnosis, billable status, and coding guidance<\/a><\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">How Pabau supports accurate ICD-10 coding<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Accurate application of unspecified protozoal disease codes like B64 depends on documentation quality at the point of care. When clinical records do not capture the causative organism, coders have no choice but to reach for the unspecified code, regardless of what testing may have been performed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau&rsquo;s digital intake and clinical forms give practitioners a structured way to capture diagnosis detail, organism identification, and relevant travel or exposure history within the patient record. That documentation becomes the foundation for accurate ICD-10-CM assignment. For practices submitting HIPAA-covered claims, Pabau&rsquo;s claims management software supports diagnosis recording and billing workflows that reduce the risk of unspecified codes appearing where specific ones should apply.<\/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-b64\/customizable-consent-and-intake-forms.webp\" alt=\"Customizable consent and intake forms\"\/><figcaption class=\"wp-element-caption\"><em>Customizable consent and intake forms<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">Coding teams managing infectious disease documentation can also benefit from structured compliance workflows that build organism identification queries into the standard review process, prompting clinicians to document specificity before the chart is closed. Practices concerned about HIPAA-compliant billing documentation will find that this level of clinical record specificity both reduces audit risk and improves coding accuracy across the full diagnosis code set.<\/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                    See how Pabau supports accurate ICD-10 diagnosis documentation                <\/h3>\n\n                <p class=\"description\">\n                    Pabau&rsquo;s structured clinical forms and claims management workflows help your team capture the specificity needed to apply the right ICD-10-CM codes &#8211; reducing unspecified code usage and supporting HIPAA-compliant billing.                <\/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 practice management platform\"\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\">B64 is a narrow-use code. It covers one specific scenario: a confirmed protozoal infection with no identified organism. Applied correctly, it is a legitimate and billable ICD-10-CM diagnosis code for FY2026 HIPAA-covered transactions. Applied incorrectly, as a substitute for specific codes when organism identification is available, it invites audit queries and claim denials.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The decision rule is simple: consult the B50-B63 range first. If the organism is documented, a specific code exists. B64 applies only in the true residual case &#8211; the same logic that governs other chapter-ending unspecified codes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For practices looking to reduce unspecified code usage, strong documentation at the point of care is the most effective intervention. To see how Pabau supports diagnosis documentation and claims management in practice, <a href=\"https:\/\/pabau.com\/book-demo\/\">book a demo<\/a> with our team.<\/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>Curious how another \u2018unspecified\u2019 code in the same ICD-10-CM chapter works?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-a64\/\">A64<\/a> covers unspecified sexually transmitted disease and follows the same specificity-first rule as B64.<\/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>Coding another infectious disease diagnosis?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/intraparenchymal-hemorrhage-icd-10-codes\/\">I61.x codes<\/a> for intraparenchymal hemorrhage show how site-specific documentation drives code selection.<\/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>Need a specific code to rule out before defaulting to unspecified?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-b79\/\">B79<\/a> covers trichuriasis, a related parasitic diagnosis in the same infectious disease chapter as B64.<\/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-1\"><h3 class=\"schema-faq-question\">What is ICD-10 Code B64?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code B64 is a billable ICD-10-CM diagnosis code for unspecified protozoal disease (also described as protozoal disease NOS). It is used when a protozoal infection is clinically confirmed but the causative organism has not been identified or documented in the clinical record. B64 is valid for fiscal year 2026 (October 1, 2025 through September 30, 2026) and is accepted in all HIPAA-covered transactions.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-2\"><h3 class=\"schema-faq-question\">Is B64 a billable ICD-10-CM code?<\/h3> <p class=\"schema-faq-answer\">Yes. B64 is a valid billable ICD-10-CM diagnosis code and a terminal code with no sub-codes beneath it. It can be submitted on claims for all HIPAA-covered transactions during fiscal year 2026. Use it as the specific code when no more specific protozoal disease code applies, rather than as a header or category code.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-3\"><h3 class=\"schema-faq-question\">When should you use B64 instead of a more specific protozoal disease code?<\/h3> <p class=\"schema-faq-answer\">Use B64 only when the protozoal infection is confirmed but the causative organism is not identified or documented. If the organism is known (Plasmodium, Leishmania, Trypanosoma, Toxoplasma, etc.), a specific code from B50-B63 must be used. If test results are still pending, use signs and symptoms codes rather than B64 &#8211; then update the code when results are available.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-4\"><h3 class=\"schema-faq-question\">What is the parent code for B64 in ICD-10-CM?<\/h3> <p class=\"schema-faq-answer\">The parent code range for B64 is B50-B64, covering protozoal diseases within Chapter 1 (Certain infectious and parasitic diseases, A00-B99). B64 is the final and most general code in this block, positioned after all specific protozoal disease codes (B50-B60).<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-5\"><h3 class=\"schema-faq-question\">What MS-DRG does ICD-10 Code B64 map to?<\/h3> <p class=\"schema-faq-answer\">B64 maps to MS-DRG 867 (with major complication or comorbidity), 868 (with complication or comorbidity), or 869 (without CC\/MCC), depending on the secondary diagnoses present on the claim. These fall under the \u00ab\u00a0Other infectious and parasitic diseases diagnoses\u00a0\u00bb grouping. Verify against the current CMS MS-DRG Definitions Manual, as grouper tables are updated annually.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-6\"><h3 class=\"schema-faq-question\">Are giardiasis and cryptosporidiosis coded under B64?<\/h3> <p class=\"schema-faq-answer\">No. Giardiasis (A07.1) and cryptosporidiosis (A07.2) have their own specific codes and both fall outside the B50-B64 protozoal diseases block, under the intestinal protozoal diseases section (A07). These should never be coded as B64 &#8211; the specific A07 sub-codes always apply when the organism is confirmed.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-7\"><h3 class=\"schema-faq-question\">Is ICD-10 Code B64 valid for fiscal year 2026?<\/h3> <p class=\"schema-faq-answer\">Yes. B64 is valid for fiscal year 2026, covering October 1, 2025 through September 30, 2026. The code has not been revised since ICD-10-CM implementation in the United States and carries no description or hierarchy changes in the FY2026 edition.<\/p><\/div><div class=\"schema-faq-section\" id=\"faq-question-8\"><h3 class=\"schema-faq-question\">What is the ICD-10 code for an unspecified protozoal infection?<\/h3> <p class=\"schema-faq-answer\">The ICD-10-CM code for an unspecified protozoal infection is B64. Use it when a protozoal infection is confirmed but the causative organism has not been identified or documented in the record. When the organism is known, assign the specific code from B50 through B63 instead.<\/p><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>ICD-10 Code B64: Definition, billable status, and FY2026 validity ICD-10 Code B64 is the billable ICD-10-CM code for unspecified protozoal disease. It applies when a protozoal infection is confirmed but the causative organism has not been identified or documented. Most protozoal infections resolve to a known organism instead, so B64 is a fallback, not a [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":154160,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"88","_yoast_wpseo_content_score":"30","_yoast_wpseo_is_cornerstone":"","_yoast_wpseo_keywordsynonyms":"[\"\",\"\",\"\",\"\"]","_yoast_wpseo_focuskw_text_input":"","_seo_original_html":"","footnotes":""},"categories":[1549,1550],"tags":[2712,1363,1305,2508],"class_list":["post-154161","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm","tag-diagnosis-coding","tag-icd-10","tag-icd-10-codes","tag-medical-coding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.3 (Yoast SEO v28.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>ICD-10 Code B64: Unspecified 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(FY2026)\",\"datePublished\":\"2026-07-14T14:22:33+00:00\",\"dateModified\":\"2026-08-17T12:08:06+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/fr\\\/diagnostic-codes\\\/icd-10-code-b64\\\/\"},\"wordCount\":2705,\"publisher\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/fr\\\/diagnostic-codes\\\/icd-10-code-b64\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/07\\\/icd-10-code-b64.webp\",\"keywords\":[\"Diagnosis coding\",\"ICD-10\",\"ICD-10 codes\",\"Medical Coding\"],\"articleSection\":[\"Diagnostic Codes\",\"ICD-10-CM\"],\"inLanguage\":\"fr-FR\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/pabau.com\\\/fr\\\/diagnostic-codes\\\/icd-10-code-b64\\\/\",\"url\":\"https:\\\/\\\/pabau.com\\\/fr\\\/diagnostic-codes\\\/icd-10-code-b64\\\/\",\"name\":\"ICD-10 Code B64: Unspecified protozoal disease 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is an all-in-one healthcare practice management software platform designed for clinics, medspas, therapists, and medical professionals. It combines scheduling, electronic health records, clinical forms, payments, marketing automation, reporting, and patient engagement tools into one secure cloud system to help practices streamline operations and grow their business.\",\"foundingDate\":\"2011-10-20\",\"numberOfEmployees\":{\"@type\":\"QuantitativeValue\",\"minValue\":\"201\",\"maxValue\":\"500\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/pabau.com\\\/fr\\\/#\\\/schema\\\/person\\\/5de22f4ff3ec59b1925ef02dce956d7d\",\"name\":\"Katy Piper\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"url\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"contentUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/03\\\/cropped-Snip20260306_177-96x96.png\",\"caption\":\"Katy Piper\"},\"description\":\"Katy Piper is a content writer covering aesthetics, dermatology, and clinic operations, with a knack for making clinical detail feel approachable. 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B64 is valid for fiscal year 2026 (October 1, 2025 through September 30, 2026) and is accepted in all HIPAA-covered transactions.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/pabau.com\/fr\/diagnostic-codes\/icd-10-code-b64\/#faq-question-2","position":2,"url":"https:\/\/pabau.com\/fr\/diagnostic-codes\/icd-10-code-b64\/#faq-question-2","name":"Is B64 a billable ICD-10-CM code?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Yes. B64 is a valid billable ICD-10-CM diagnosis code and a terminal code with no sub-codes beneath it. It can be submitted on claims for all HIPAA-covered transactions during fiscal year 2026. 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If test results are still pending, use signs and symptoms codes rather than B64 - then update the code when results are available.","inLanguage":"fr-FR"},"inLanguage":"fr-FR"},{"@type":"Question","@id":"https:\/\/pabau.com\/fr\/diagnostic-codes\/icd-10-code-b64\/#faq-question-4","position":4,"url":"https:\/\/pabau.com\/fr\/diagnostic-codes\/icd-10-code-b64\/#faq-question-4","name":"What is the parent code for B64 in ICD-10-CM?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The parent code range for B64 is B50-B64, covering protozoal diseases within Chapter 1 (Certain infectious and parasitic diseases, A00-B99). 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