{"id":159186,"date":"2026-07-20T11:52:14","date_gmt":"2026-07-20T11:52:14","guid":{"rendered":"https:\/\/pabau.com\/?p=159186"},"modified":"2026-08-18T12:41:42","modified_gmt":"2026-08-18T12:41:42","slug":"icd-10-code-f05","status":"publish","type":"post","link":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-f05\/","title":{"rendered":"ICD-10 Code F05: Delirium due to known physiological condition"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"ICD-10 Code F05: Delirium due to known physiological condition\",\"description\":\"ICD-10 Code F05 (Delirium due to known physiological condition) is a billable 2026 ICD-10-CM code. Learn includes, excludes, sequencing rules, and documentation guidance.\",\"url\":\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-f05\/\",\"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\":\"2026-07-20\",\"dateModified\":\"2026-07-20\"}<\/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 F05 is a billable, specific ICD-10-CM diagnosis code for delirium due to a known physiological condition, 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>F05 covers eight included terms: acute confusional state, sundowning, delirium superimposed on dementia, infective psychosis, and more &#8211; but excludes delirium NOS (R41.0) and substance-withdrawal delirium.<\/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 sequence F05 as a secondary code after the underlying physiological cause; documentation must explicitly link the two conditions.<\/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 helps clinicians capture the physiological linkage, onset details, and DSM-5 criteria needed to support F05 coding at audit.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code F05 describes delirium due to a known physiological condition, and it is one of the most frequently undercoded diagnoses in inpatient and post-acute settings. Delirium goes unrecognized in a majority of cases, and when it is documented, incorrect code selection leads to claim denials and audit risk.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dementia codes like F02.80 share similar documentation traps, but F05 carries its own sequencing rules that catch coders off guard.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This reference covers ICD-10 Code F05&#8217;s official definition, every included term, Excludes1 restrictions, coding and sequencing rules, documentation requirements, and a related-code crosswalk &#8211; everything coders and clinicians need for accurate FY2026 billing.<\/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\"><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><\/figure>\n\n\n\n<h2 id=\"h-icd-10-code-f05-definition-and-2026-edition-details\" class=\"wp-block-heading\">ICD-10 Code F05: Definition and 2026 edition details<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ICD-10 Code F05 describes <strong>Delirium due to known physiological condition<\/strong>. It sits within the F01-F09 block (\u00abMental disorders due to known physiological conditions\u00bb) of Chapter 5 in ICD-10-CM.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The code is billable and specific &#8211; it can be submitted directly for reimbursement without a more detailed subcode. Per the <a href=\"https:\/\/www.cms.gov\/medicare\/coding-billing\/icd-10-codes\" target=\"_blank\" rel=\"nofollow noopener\">CMS ICD-10 codes page<\/a>, the FY2026 edition of F05 became effective on October 1, 2025.<\/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\">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\">F05<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Official description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Delirium due to known physiological condition<\/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 (no further specificity required)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">ICD-10-CM chapter<\/td>\n<td style=\"padding:12px 16px;color:#374151\">F01-F09: Mental disorders due to known physiological conditions<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">FY2026 effective date<\/td>\n<td style=\"padding:12px 16px;color:#374151\">October 1, 2025<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">ICD-9-CM equivalents<\/td>\n<td style=\"padding:12px 16px;color:#374151\">293.0 (Delirium due to conditions classified elsewhere), 293.1 (Subacute delirium)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Present on Admission (POA)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Required for inpatient claims; POA indicator affects HAC payment adjustment<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h2 id=\"h-what-icd-10-code-f05-includes-approximate-synonyms-and-included-terms\" class=\"wp-block-heading\">What ICD-10 Code F05 includes: approximate synonyms and included terms<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">F05 has a broad scope. The CMS tabular list includes eight official terms under this code, all representing delirium arising from a physiological cause. Coders who miss these synonyms may query whether a separate code exists when F05 already covers the presentation.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Acute or subacute brain syndrome<\/strong><\/li>\n\n\n\n<li><strong>Acute or subacute confusional state<\/strong><\/li>\n\n\n\n<li><strong>Acute or subacute infective psychosis<\/strong><\/li>\n\n\n\n<li><strong>Acute or subacute organic reaction<\/strong><\/li>\n\n\n\n<li><strong>Acute or subacute psycho-organic syndrome<\/strong><\/li>\n\n\n\n<li><strong>Delirium of mixed etiology<\/strong><\/li>\n\n\n\n<li><strong>Delirium superimposed on dementia<\/strong><\/li>\n\n\n\n<li><strong>Sundowning<\/strong><\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">The \u00abacute or subacute\u00bb qualifier in the first five terms matters clinically. Delirium can persist for days to weeks.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When the onset is gradual or the course is prolonged, it may be tempting to reach for a dementia or encephalopathy code &#8211; but F05 remains correct as long as an underlying physiological cause drives the presentation. The <a href=\"https:\/\/icd10cmtool.cdc.gov\/\" target=\"_blank\" rel=\"nofollow noopener\">CDC\/NCHS ICD-10-CM lookup tool<\/a> confirms all eight terms under a single F05 entry for FY2026.<\/p>\n\n\n\n<h2 id=\"h-excludes1-and-excludes2-notes-for-f05\" class=\"wp-block-heading\">Excludes1 and Excludes2 notes for F05<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Excludes1 means the excluded code and F05 cannot be reported together for the same encounter. Excludes2 means the excluded condition is not part of F05, but both codes can coexist if both are present and documented.<\/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\">Note type<\/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<\/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 implication<\/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\">Excludes1<\/td>\n<td style=\"padding:12px 16px;color:#374151\">R41.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Delirium NOS<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use R41.0 only when the physiological cause is unidentified. Cannot code both F05 and R41.0 for the same episode.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Excludes2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">F10.231<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Alcohol dependence with withdrawal delirium (delirium tremens)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Not part of F05, but both codes may be reported together for the same encounter when clinically documented.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Excludes2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">F10.921<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Alcohol use, unspecified with withdrawal delirium<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Same principle as F10.231 &#8211; both codes may be reported together for the same encounter when clinically documented.<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Excludes2<\/td>\n<td style=\"padding:12px 16px;color:#374151\">F11.121 \/ F11.221 \/ F11.921<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Opioid abuse, dependence, or unspecified use with intoxication delirium<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Opioid-induced delirium is coded under intoxication, not a withdrawal subcode. As with alcohol, this code and F05 may both be reported when clinically documented.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The R41.0 exclusion catches the most coding errors. When the admitting diagnosis is \u00abaltered mental status\u00bb or \u00abconfusion\u00bb and the workup is still in progress, R41.0 may be appropriate at admission. Once the physiological cause is identified &#8211; sepsis, post-operative state, metabolic derangement &#8211; the coder should update the record to F05 with the cause coded first.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Psychologists code these diagnoses daily, and <a href=\"https:\/\/pabau.com\/industry\/psychology-practice-software\/\">psychology practice software<\/a> keeps session notes, assessments, and billing together.<\/p>\n\n\n\n<h2 id=\"h-coding-and-sequencing-rules-for-icd-10-code-f05\" class=\"wp-block-heading\">Coding and sequencing rules for ICD-10 Code F05<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">F05 is a manifestation code. Per the ICD-10-CM Official Guidelines for Coding and Reporting, the underlying physiological condition drives the principal diagnosis &#8211; F05 follows as an additional code.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Clinicians who document \u00abdelirium\u00bb without linking it to a cause give coders no basis to sequence correctly, which creates both undercoding and audit exposure. <\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Identify the underlying cause<\/strong> &#8211; sepsis (A41.xx), pneumonia (Jxx.x), hepatic encephalopathy (K72.x), postoperative state (T81.xx), or other physiological condition.<\/li>\n\n\n\n<li><strong>Sequence the cause first<\/strong> &#8211; the physiological condition is the principal\/first-listed diagnosis.<\/li>\n\n\n\n<li><strong>Add F05 as an additional code<\/strong> &#8211; confirm the documentation explicitly states the delirium is due to (or a manifestation of) the underlying condition.<\/li>\n\n\n\n<li><strong>Add the dementia code if applicable<\/strong> &#8211; for delirium superimposed on dementia, code the dementia first (F01.xx-F03.xx as appropriate), then F05.<\/li>\n\n\n\n<li><strong>Assign the POA indicator<\/strong> &#8211; for inpatient claims, document whether the delirium was present on admission or hospital-acquired. Hospital-acquired delirium (POA = N) affects HAC payment adjustments.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Sequencing rules can vary by payer. Some Medicare Advantage plans and state Medicaid programs have supplemental guidelines. Verify against the applicable payer&#8217;s LCD\/LCA before finalizing the claim.<\/p>\n\n\n\n<h2 id=\"h-documentation-requirements-for-f05\" class=\"wp-block-heading\">Documentation requirements for F05<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Without adequate documentation, even the correct code selection becomes indefensible at audit. Clinicians using safer clinical note practices build the evidentiary chain reviewers look for. A structured psychiatric evaluation template speeds up this process considerably.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The record must capture four elements to fully support F05:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Named physiological cause<\/strong> &#8211; state it explicitly (e.g. \u00abdelirium due to urinary tract infection\u00bb). Vague language like \u00abaltered mental status in the context of infection\u00bb is insufficient for precise F05 coding.<\/li>\n\n\n\n<li><strong>Onset and fluctuation<\/strong> &#8211; DSM-5 Criterion B requires acute onset and fluctuating course. Document when symptoms first appeared and any variation over the day.<\/li>\n\n\n\n<li><strong>Attention and awareness disturbance<\/strong> &#8211; DSM-5 Criterion A. Formal assessments (CAM, CAM-ICU, 4AT) provide objective evidence. Reference the tool and the score.<\/li>\n\n\n\n<li><strong>Causal linkage<\/strong> &#8211; the note must state the delirium is \u00abdue to,\u00bb \u00abcaused by,\u00bb or \u00aba result of\u00bb the physiological condition. Temporal coincidence alone is not sufficient.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Using digital intake forms pre-configured with CAM or 4AT screening fields ensures the assessment data is captured at the bedside and flows directly into the clinical record, rather than being reconstructed from memory later.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is especially useful in high-volume environments like post-surgical units &#8211; including after anesthesia-heavy procedures such as 00192 &#8211; or geriatric wards where F05 is frequently applicable.<\/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-f05\/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        <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 physiological cause using its own code-level language in the assessment note &#8211; not just the chief complaint. Write &#8216;delirium due to Escherichia coli urosepsis&#8217; rather than &#8216;confusion with concurrent UTI.&#8217; Coders need the causal verb, not just co-existing conditions.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-delirium-vs-dementia-icd-10-code-f05-coding-differences\" class=\"wp-block-heading\">Delirium vs dementia: ICD-10 Code F05 coding differences<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Delirium and dementia overlap in presentation, and the distinction changes both the diagnosis code and sequencing. Getting this wrong at coding risks DRG miscalculation and clinical record inaccuracy.<\/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\">Feature<\/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\">Delirium (F05)<\/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\">Dementia (F01-F03)<\/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\">Onset<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Acute (hours to days)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Gradual (months to years)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Course<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Fluctuating; often worse at night<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Progressive but stable day-to-day<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Attention<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Severely impaired; core feature<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Preserved early; impaired late<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Consciousness<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Clouded or altered<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Usually clear until late stages<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Reversibility<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Usually reversible with treatment<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Irreversible (degenerative)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">ICD-10 code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">F05 (with underlying cause coded first)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">F01.xx, F02.xx, F03.xx depending on type<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Both present<\/td>\n<td style=\"padding:12px 16px;color:#374151\" colspan=\"2\">Code dementia first, add F05 as secondary (delirium superimposed on dementia)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The \u00abboth present\u00bb scenario is the most clinically common and the most frequently miscoded. Dementia patients are disproportionately affected by delirium &#8211; sundowning is its clearest expression. When both are documented, two codes are required. The dementia code goes first; F05 follows. Omitting F05 understates case complexity and can affect DRG assignment.<\/p>\n\n\n\n<h2 id=\"h-clinical-subtypes-hyperactive-hypoactive-and-mixed-delirium\" class=\"wp-block-heading\">Clinical subtypes: hyperactive, hypoactive, and mixed delirium<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">All three motor subtypes of delirium are coded as F05 &#8211; there is no ICD-10-CM subcode for hyperactive versus hypoactive presentation. The distinction matters clinically and for documentation, but not for code selection.<\/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\">Subtype<\/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 signs<\/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\">Coding note<\/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\">Hyperactive<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Agitation, combativeness, hallucinations, pulling at lines<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Easiest to recognize; F05 most likely to be coded correctly<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Hypoactive<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Withdrawal, somnolence, slow responses, reduced interaction<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Frequently miscoded as depression (F32.xx) or sedation effect &#8211; documentation of fluctuating attention and acute onset is critical<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Mixed<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Alternating between hyperactive and hypoactive features<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Coded as F05 (delirium of mixed etiology is an official included term); document both feature sets<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Hypoactive delirium is the most clinically dangerous from a documentation standpoint. Its quiet presentation means it&#8217;s often attributed to fatigue, post-sedation, or depression.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Clinicians unfamiliar with the subtype may not use delirium language in the note &#8211; meaning coders have no basis for F05. Resources on healthcare burnout highlight how cognitive load affects documentation accuracy across specialties. Formal screening tools (CAM, 4AT) catch hypoactive delirium before it disappears from the record.<\/p>\n\n\n\n<h2 id=\"h-common-clinical-scenarios-requiring-f05\" class=\"wp-block-heading\">Common clinical scenarios requiring F05<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">F05 applies across a wide range of settings. The unifying requirement is an identified physiological cause &#8211; not the care environment or the patient&#8217;s age.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Postoperative delirium:<\/strong> Code F05 as additional diagnosis; principal is the surgical procedure or postoperative complication &#8211; whether a joint procedure such as 27130 or a device implant such as L8680. Document that delirium emerged in the post-anesthesia or early recovery period.<\/li>\n\n\n\n<li><strong>ICU delirium:<\/strong> Common in mechanically ventilated patients. Use CAM-ICU for screening. Code F05 with sepsis (A41.xx), respiratory failure (J96.xx), or other ICU driver as principal.<\/li>\n\n\n\n<li><strong>Sundowning in dementia patients:<\/strong> Code the dementia type first, then F05. The term \u00absundowning\u00bb alone in the record is sufficient &#8211; it is an official included term.<\/li>\n\n\n\n<li><strong>Infection-related delirium:<\/strong> Pneumonia, UTI, and sepsis are the most common causes in elderly patients. The infection code is sequenced first.<\/li>\n\n\n\n<li><strong>Metabolic delirium:<\/strong> Hyponatremia, hypercalcemia, hepatic encephalopathy, thyroid storm. Code the metabolic condition first; add F05 as secondary.<\/li>\n\n\n\n<li><strong>Delirium on substance withdrawal background (physiological, not substance-induced):<\/strong> If an alcohol-dependent patient develops delirium from hepatic failure rather than withdrawal, F05 applies &#8211; not F10.231. The distinction is in the documented cause, not the substance history.<\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-sundowning-and-delirium-superimposed-on-dementia-specific-guidance\" class=\"wp-block-heading\">Sundowning and delirium superimposed on dementia: specific guidance<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">These two included terms under F05 generate more coding questions than all others combined. Both involve elderly patients with underlying cognitive conditions, and both are frequently undercoded because clinicians treat them as expected features of dementia rather than separately billable complications.<\/p>\n\n\n\n<h3 id=\"h-sundowning\" class=\"wp-block-heading\">Sundowning<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Sundowning refers to the late-afternoon and evening exacerbation of confusion, agitation, and disorientation seen in dementia patients. It is an official included term under F05, not a standalone code. To code it correctly:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Document \u00absundowning\u00bb explicitly &#8211; the term alone is sufficient to support F05.<\/li>\n\n\n\n<li>Code the underlying dementia first (e.g., F03.90 for unspecified dementia without behavioral disturbance).<\/li>\n\n\n\n<li>Add F05 as an additional code.<\/li>\n\n\n\n<li>Do not use R41.3 (other amnesia) or R41.89 (other symptoms of cognitive functions) in place of F05 when sundowning is documented.<\/li>\n<\/ol>\n\n\n\n<h3 id=\"h-delirium-superimposed-on-dementia\" class=\"wp-block-heading\">Delirium superimposed on dementia<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">When delirium develops in a patient with established dementia, both conditions are coded. This is not a situation where one replaces the other. The sequencing follows the same rule: dementia first (F01.xx-F03.xx), then F05. The documentation must state the delirium is acute and represents a change from the patient&#8217;s cognitive baseline &#8211; not just worsened chronic confusion.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key documentation tip: include a sentence comparing current cognition to the patient&#8217;s known baseline. \u00abPatient&#8217;s family reports she is significantly more confused than her usual dementia presentation over the past 48 hours\u00bb gives coders the acute-on-chronic distinction they need to apply F05 on top of the dementia code. A dated MoCA score makes that baseline concrete; our guide to <a href=\"https:\/\/pabau.com\/blog\/moca-score-interpretation\/\">MoCA score interpretation<\/a> explains the bands.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For clinicians seeking a reference framework, Pabau&#8217;s psychiatric evaluation template includes a baseline-versus-current cognitive comparison section.<\/p>\n\n\n\n<h2 id=\"h-related-icd-10-codes-to-know-alongside-f05\" class=\"wp-block-heading\">Related ICD-10 codes to know alongside F05<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Several codes are commonly confused with F05, used alongside it, or serve as the correct alternative when F05&#8217;s conditions are not met. The <a href=\"https:\/\/www.aapc.com\/codes\/icd-10-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC ICD-10-CM code search<\/a> and the <a href=\"https:\/\/icd.who.int\/browse10\/2019\/en\" target=\"_blank\" rel=\"nofollow noopener\">WHO ICD-10 browser<\/a> are the primary references for navigating the full classification hierarchy.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For related psychiatric coding, see F32.9 and <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-f10-alcohol-use-disorder\/\">F10<\/a> for sequencing parallels.<\/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\">Relationship to F05<\/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\">R41.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Delirium NOS<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Excludes1 &#8211; use when cause is unidentified; mutually exclusive with F05<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">F10.231<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Alcohol dependence with withdrawal delirium (delirium tremens)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Excludes2 &#8211; not part of F05, but both codes may be reported together for the same encounter when clinically documented<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">G93.40<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Encephalopathy, unspecified<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Related but distinct; encephalopathy is neurological, delirium is the psychiatric manifestation &#8211; both may apply simultaneously<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">R41.3<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Other amnesia \/ altered mental status<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Use when delirium is not documented; do not use as a synonym for F05<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">F01.xx<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Vascular dementia<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Code first when dementia is the primary diagnosis; add F05 if delirium is superimposed<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">F03.xx<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unspecified dementia<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Most common dementia code used with F05 in sundowning scenarios<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">F11.121 \/ F11.221 \/ F11.921<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Opioid abuse, dependence, or unspecified use with intoxication delirium<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Excludes2 &#8211; opioid-induced delirium is coded under intoxication, not withdrawal; both codes may be reported alongside F05 when clinically documented<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\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-f0631\/\">ICD-10 code F06.31 \u2014 Mood Disorder Due to Known Physiological Condition<\/a><\/li>\n\n\n<li><a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-f09\/\">ICD-10 Code F09 \u2014 Unspecified mental disorder<\/a><\/li>\n<\/ul>\n\n\n\n<h2 id=\"h-how-pabau-supports-accurate-icd-10-code-f05-documentation\" class=\"wp-block-heading\">How Pabau supports accurate ICD-10 Code F05 documentation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Delirium documentation fails most often not because clinicians don&#8217;t know the diagnosis, but because the note structure doesn&#8217;t capture what coders need. Pabau&#8217;s mental health EMR and psychiatry EMR software include structured assessment templates that can be configured to capture the four F05 documentation requirements at the point of care.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau&#8217;s client record management system timestamps all clinical entries, providing an audit trail that supports the acute-onset documentation DSM-5 requires. <\/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-f05\/detailed-client-records-in-pabau.webp\" alt=\"Detailed client records in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Detailed client records in Pabau<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">For geriatric and post-acute settings where sundowning and delirium superimposed on dementia are most common, pre-configured digital forms can include CAM screening fields and a baseline-versus-current cognition comparison prompt, ensuring every F05 encounter has the documentation to survive payer review.<\/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                    Reduce coding errors and audit exposure                <\/h3>\n\n                <p class=\"description\">\n                    Pabau helps clinicians capture the diagnosis linkage, onset timeline, and screening data needed to support accurate ICD-10 Code F05 coding &#8211; all within a structured clinical record that&#8217;s audit-ready from the moment the consultation ends.                <\/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 interface\"\n                    loading=\"lazy\"\n                \/>\n            <\/div>\n        <\/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>Flag encounters where an ICD-10 Code F05 is assigned but the underlying cause code does not appear in the same claim. Most billing software can run a code-pair audit &#8211; configure it as a routine pre-submission check to catch sequencing errors before the payer does.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-conclusion\" class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">F05 is a deceptively simple code &#8211; one descriptor, eight included terms, and a clear sequencing rule. The failure points are documentation, not code selection: missing the causal linkage, skipping the underlying condition code, and leaving hypoactive delirium undocumented as depression. Each error affects DRG accuracy, case mix index, and payer audit exposure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pabau&#8217;s structured clinical notes, configurable screening forms, and AI-assisted documentation capture the four elements needed to support F05 at audit. To see how Pabau handles clinical documentation for behavioral health and neuropsychiatric diagnoses, explore Pabau&#8217;s psychiatry EMR software or <a href=\"https:\/\/pabau.com\/book-demo\/\" data-type=\"page\" data-id=\"5756\">speak with the team<\/a>.<\/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>Need to code a negative dementia screening result?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-g9920\/\">G9920<\/a> is the companion HCPCS code often billed alongside geriatric encounters where F05 also applies.<\/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 the record supports delirium yet?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-r4182\/\">R41.82<\/a> covers altered mental status before a specific cause is confirmed.<\/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>Ruling out psychiatric causes before coding delirium?<\/strong> <a href=\"https:\/\/pabau.com\/diagnostic-codes\/icd-10-code-f209-schizophrenia-unspecified\/\">F20.9<\/a> is the code when symptoms point to schizophrenia rather than a physiological or substance-induced cause.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-frequently-asked-questions\" 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-1784539389691\"><h3 class=\"schema-faq-question\">What is ICD-10 Code F05?<\/h3> <p class=\"schema-faq-answer\">ICD-10 Code F05 is a billable, specific diagnosis code for Delirium due to known physiological condition, valid for FY2026. It covers acute and subacute confusional states, sundowning, delirium superimposed on dementia, and other presentations where an identified underlying medical cause drives the delirium. It sits in the F01-F09 block of Chapter 5 of ICD-10-CM.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784539389692\"><h3 class=\"schema-faq-question\">What is the difference between F05 and R41.0?<\/h3> <p class=\"schema-faq-answer\">F05 (Delirium due to known physiological condition) requires an identified underlying cause; R41.0 (Delirium NOS) is used when the cause is unidentified or unspecified. These are Excludes1 codes &#8211; they cannot be reported together for the same episode of delirium. Once the physiological cause is determined, update to F05.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784539389693\"><h3 class=\"schema-faq-question\">How do you code delirium superimposed on dementia?<\/h3> <p class=\"schema-faq-answer\">Code the dementia first (F01.xx, F02.xx, or F03.xx depending on type and behavioral disturbance), then add F05 as an additional code. The documentation must note that the delirium represents an acute change from the patient&#8217;s cognitive baseline &#8211; not simply progression of the dementia.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784539389694\"><h3 class=\"schema-faq-question\">What are the Excludes1 notes for ICD-10 Code F05?<\/h3> <p class=\"schema-faq-answer\">The only Excludes1 note for F05 is R41.0 (Delirium NOS) &#8211; these two codes cannot be used together. Substance-induced delirium, such as alcohol withdrawal delirium (F10.231, F10.921) and opioid intoxication delirium (F11.121, F11.221, F11.921), is an Excludes2 note instead, meaning both F05 and the substance-related code may be reported together for the same encounter when clinically documented.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784539389695\"><h3 class=\"schema-faq-question\">What is the ICD-9-CM equivalent of F05?<\/h3> <p class=\"schema-faq-answer\">The ICD-9-CM equivalents are 293.0 (Acute delirium due to conditions classified elsewhere) and 293.1 (Subacute delirium). Both map to F05 in the General Equivalence Mappings (GEMs) used for crosswalk purposes.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1784539389696\"><h3 class=\"schema-faq-question\">Is F05 the correct ICD-10 code for encephalopathy?<\/h3> <p class=\"schema-faq-answer\">No. Encephalopathy is coded under G93.40 (encephalopathy, unspecified) or a more specific G93.4x code depending on type. Encephalopathy and delirium can coexist and both may be coded in the same encounter, but F05 describes the psychiatric manifestation (disturbed consciousness and attention) while G93.4x describes the neurological pathology.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>ICD-10 Code F05 describes delirium due to a known physiological condition, and it is one of the most frequently undercoded diagnoses in inpatient and post-acute settings. Delirium goes unrecognized in a majority of cases, and when it is documented, incorrect code selection leads to claim denials and audit risk. Dementia codes like F02.80 share similar [&hellip;]<\/p>\n","protected":false},"author":77,"featured_media":159184,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"91","_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":[3863,1386],"class_list":["post-159186","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-diagnostic-codes","category-icd-10-cm","tag-delirium","tag-icd"],"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 F05: Delirium due to known physiological condition<\/title>\n<meta name=\"description\" content=\"F05 is a billable ICD-10 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Substance-induced delirium, such as alcohol withdrawal delirium (F10.231, F10.921) and opioid intoxication delirium (F11.121, F11.221, F11.921), is an Excludes2 note instead, meaning both F05 and the substance-related code may be reported together for the same encounter when clinically documented.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-f05\/#faq-question-1784539389695","position":5,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-f05\/#faq-question-1784539389695","name":"What is the ICD-9-CM equivalent of F05?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"The ICD-9-CM equivalents are 293.0 (Acute delirium due to conditions classified elsewhere) and 293.1 (Subacute delirium). Both map to F05 in the General Equivalence Mappings (GEMs) used for crosswalk purposes.","inLanguage":"es"},"inLanguage":"es"},{"@type":"Question","@id":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-f05\/#faq-question-1784539389696","position":6,"url":"https:\/\/pabau.com\/es\/diagnostic-codes\/icd-10-code-f05\/#faq-question-1784539389696","name":"Is F05 the correct ICD-10 code for encephalopathy?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"No. Encephalopathy is coded under G93.40 (encephalopathy, unspecified) or a more specific G93.4x code depending on type. Encephalopathy and delirium can coexist and both may be coded in the same encounter, but F05 describes the psychiatric manifestation (disturbed consciousness and attention) while G93.4x describes the neurological pathology.","inLanguage":"es"},"inLanguage":"es"}]}},"yoast":{"focus_keyword":"ICD-10 Code F05","seo_title":"ICD-10 Code F05: Delirium due to known physiological condition","meta_description":"F05 is a billable ICD-10 code for delirium due to a known physiological condition, covering 8 included terms and cause-first sequencing.","content_score":"30","is_cornerstone":"","related_keyphrases":[{"keyword":"delirium due to known physiological condition","score":78},{"keyword":"acute confusional state","score":61},{"keyword":"delirium superimposed on dementia","score":70},{"keyword":"sundowning icd-10","score":61},{"keyword":"delirium coding guidelines","score":61}]},"_links":{"self":[{"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/posts\/159186","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/users\/77"}],"replies":[{"embeddable":true,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/comments?post=159186"}],"version-history":[{"count":5,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/posts\/159186\/revisions"}],"predecessor-version":[{"id":184029,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/posts\/159186\/revisions\/184029"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/media\/159184"}],"wp:attachment":[{"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/media?parent=159186"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/categories?post=159186"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pabau.com\/es\/wp-json\/wp\/v2\/tags?post=159186"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}