2026 ICD-10-CM Diagnosis Code F21Schizotypal disorder

ICD-10-CM Codes›F01–F99›F20-F29›F21

ICD-10-CM F21
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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). 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.

Code Identity

ICD-10-CM Code
F21
Billable Status
Yes — Valid for Submission
Code Describes
Schizotypal disorder
Chapter
F20-F29
Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF20-F29Schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders
CategoryF21Schizotypal disorder
This CodeF21Schizotypal disorder

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

  • Asperger's syndrome F84.5
  • schizoid personality disorder F60.1

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Disorder(of)
      • personality
        • schizotypal
    • Disorder(of)
      • schizotypal (personality)
    • Reaction
      • schizophrenic
        • latent
    • Schizophrenia, schizophrenic
      • borderline
    • Schizophrenia, schizophrenic
      • incipient
    • Schizophrenia, schizophrenic
      • latent
    • Schizophrenia, schizophrenic
      • prepsychotic
    • Schizophrenia, schizophrenic
      • prodromal
    • Schizophrenia, schizophrenic
      • pseudoneurotic
    • Schizophrenia, schizophrenic
      • pseudopsychopathic

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD009
Personality disorders
Default principal diagnosis: inpatient No · outpatient No
CCSR MBD001
Schizophrenia spectrum and other psychotic disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

ICD-9-CM
301.22 Schizotypal person dis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F21Overview

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 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.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.