2026 ICD-10-CM Diagnosis Code F21Schizotypal disorder
ICD-10-CM Codes›F01–F99›F20-F29›F21
- Billable — Valid for Submission
- Risk Adjusts — HCC 153
- Chronic Condition
F21 is a billable ICD-10-CM diagnosis code for schizotypal disorder. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 883. Coders also document this condition as cluster A personality disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Personality disorders and Schizophrenia spectrum and other psychotic disorders.
For Medicare Advantage risk adjustment, F21 maps to CMS-HCC Category 153 (Personality Disorders; Anorexia/Bulimia Nervosa) under the V28 model, adding a risk factor of about 0.396 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
F21 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2026.
Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cluster A personality disorder
- Latent schizophrenia
- Latent schizophrenia in remission
- Schizophrenia in remission
- Schizophrenic prodrome
- Schizotypal personality disorder
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Borderline schizophrenia
- Latent schizophrenia
- Latent schizophrenic reaction
- Prepsychotic schizophrenia
- Prodromal schizophrenia
- Pseudoneurotic schizophrenia
- Pseudopsychopathic schizophrenia
- Schizotypal personality disorder
Type 2 Excludes
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disorder (of) See Also: Disease;
personality See Also: Personality; F60.9
schizotypal F21
Schizophrenia, schizophrenic F20.9
borderline F21
incipient F21
latent F21
prepsychotic F21
prodromal F21
pseudoneurotic F21
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Schizotypal Personality Disorder
a personality disorder in which there are oddities of thought (magical thinking, paranoid ideation, suspiciousness), perception (illusions, depersonalization), speech (digressive, vague, overelaborate), and behavior (inappropriate affect in social interactions, frequently social isolation) that are not severe enough to characterize schizophrenia.
Patient EducationClinical
Personality Disorders
Your personality is your own way of thinking, feeling, behaving, and relating to others. Once you become an adult, your personality usually doesn't change much.
The full article covers:
- What is personality?
- What are personality disorders?
- What are the types of personality disorders?
- What causes personality disorders?
- What are the symptoms of personality disorders?
- How are personality disorders diagnosed?
- How are personality disorders treated?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert F21 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About F21Overview
What is the ICD-10 code for schizotypal disorder?
The ICD-10-CM code for schizotypal disorder is F21. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is F21 (Schizotypal disorder) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report schizotypal disorder on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does F21 group to?
When schizotypal disorder is the principal diagnosis on an inpatient stay, it groups to MS-DRG 883 (disorders of Personality and Impulse Control), which carries a relative weight of 1.9663. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of F21?
Under the General Equivalence Mappings, schizotypal disorder converts to ICD-9-CM 301.22 (schizotypal person dis). The mapping is a direct match.
What HCC is F21?
F21 (schizotypal disorder) maps to CMS-HCC Category 153 (Personality Disorders; Anorexia/Bulimia Nervosa), commonly written as HCC 153, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. It mapped to HCC 60 under the retired V24 model. It also maps in the ESRD (V24) model. In the Part D prescription drug model it maps to RxHCC 133.
Does F21 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, F21 adds a risk adjustment factor of about 0.396 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.199 to 0.464 depending on the payment segment). A more severe related category (HCC 151 and HCC 152) supersedes it when both are reported. See the full factor table on the HCC 153 category page.
