2019 ICD-10-CM Diagnosis Code F21

Schizotypal disorder

    2016 2017 2018 2019 Billable/Specific Code
  • F21 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2019 edition of ICD-10-CM F21 became effective on October 1, 2018.
  • This is the American ICD-10-CM version of F21 - other international versions of ICD-10 F21 may differ.
Applicable To
  • Borderline schizophrenia
  • Latent schizophrenia
  • Latent schizophrenic reaction
  • Prepsychotic schizophrenia
  • Prodromal schizophrenia
  • Pseudoneurotic schizophrenia
  • Pseudopsychopathic schizophrenia
  • Schizotypal personality disorder
Type 2 Excludes
Type 2 Excludes Help
A type 2 excludes note represents "not included here". A type 2 excludes note indicates that the condition excluded is not part of the condition it is excluded from but a patient may have both conditions at the same time. When a type 2 excludes note appears under a code it is acceptable to use both the code (F21) and the excluded code together.
  • Asperger's syndrome (
    ICD-10-CM Diagnosis Code F84.5

    Asperger's syndrome

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Asperger's disorder
    • Autistic psychopathy
    • Schizoid disorder of childhood
    F84.5
    )
  • schizoid personality disorder (
    ICD-10-CM Diagnosis Code F60.1

    Schizoid personality disorder

      2016 2017 2018 2019 Billable/Specific Code
    Type 2 Excludes
    • Asperger's syndrome (F84.5)
    • delusional disorder (F22)
    • schizoid disorder of childhood (F84.5)
    • schizophrenia (F20.-)
    • schizotypal disorder (F21)
    F60.1
    )
The following code(s) above F21 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to F21:
  • F01-F99
    2019 ICD-10-CM Range F01-F99

    Mental, Behavioral and Neurodevelopmental disorders

    Includes
    • disorders of psychological development
    Type 2 Excludes
    • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)
    Mental, Behavioral and Neurodevelopmental disorders
Approximate Synonyms
  • Acute exacerbation of chronic latent schizophrenia
  • Acute exacerbation of subchronic latent schizophrenia
  • Chronic latent schizophrenia
  • Latent schizophrenia
  • Latent schizophrenia in remission
  • Schizophrenia, latent
  • Schizophrenia, latent, chronic
  • Schizophrenia, latent, chronic, acute exacerbation
  • Schizophrenia, latent, in remission
  • Schizophrenia, latent, subchronic
  • Schizophrenia, latent, subchronic, acute exacerbation
  • Schizotypal personality disorder
  • Subchronic latent schizophrenia
Clinical Information
  • A disorder characterized by an enduring pattern of inability to establish close relationships coupled with cognitive or perceptual distortions, odd beliefs and speech, and eccentric behavior and appearance.
  • 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.
  • Personality disorder characterized by eccentric thoughts and appearance, inappropriate affect and behavior, extreme social anxiety, and limited interpersonal interaction.
ICD-10-CM F21 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):
  • 883 Disorders of personality and impulse control

Convert F21 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
Code annotations containing back-references to F21:
  • Type 2 Excludes: F20
    , F60.1
    ICD-10-CM Diagnosis Code F20

    Schizophrenia

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    Type 2 Excludes
    ICD-10-CM Diagnosis Code F60.1

    Schizoid personality disorder

      2016 2017 2018 2019 Billable/Specific Code
    Type 2 Excludes
    • Asperger's syndrome (F84.5)
    • delusional disorder (F22)
    • schizoid disorder of childhood (F84.5)
    • schizophrenia (F20.-)
    • schizotypal disorder (F21)

Diagnosis Index entries containing back-references to F21:
  • Disorder (of) - see also Disease
    • personality F60.9
      - see also Personality
      ICD-10-CM Diagnosis Code F60.9

      Personality disorder, unspecified

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Character disorder NOS
      • Character neurosis NOS
      • Pathological personality NOS
      • schizotypal F21
    • schizotypal F21 (personality)
  • Reaction - see also Disorder
    • schizophrenic F23
      ICD-10-CM Diagnosis Code F23

      Brief psychotic disorder

        2016 2017 2018 2019 Billable/Specific Code
      Applicable To
      • Paranoid reaction
      • Psychogenic paranoid psychosis
      Type 2 Excludes
      • latent F21
  • Schizophrenia, schizophrenic F20.9
    ICD-10-CM Diagnosis Code F20.9

    Schizophrenia, unspecified

      2016 2017 2018 2019 Billable/Specific Code
    • borderline F21
    • incipient F21
    • latent F21
    • prepsychotic F21
    • prodromal F21
    • pseudoneurotic F21
    • pseudopsychopathic F21

ICD-10-CM Codes Adjacent To F21
F20 Schizophrenia
F20.0 Paranoid schizophrenia
F20.1 Disorganized schizophrenia
F20.2 Catatonic schizophrenia
F20.3 Undifferentiated schizophrenia
F20.5 Residual schizophrenia
F20.8 Other schizophrenia
F20.81 Schizophreniform disorder
F20.89 Other schizophrenia
F20.9 Schizophrenia, unspecified
F21 Schizotypal disorder
F22 Delusional disorders
F23 Brief psychotic disorder
F24 Shared psychotic disorder
F25 Schizoaffective disorders
F25.0 Schizoaffective disorder, bipolar type
F25.1 Schizoaffective disorder, depressive type
F25.8 Other schizoaffective disorders
F25.9 Schizoaffective disorder, unspecified
F28 Other psychotic disorder not due to a substance or known physiological condition
F29 Unspecified psychosis not due to a substance or known physiological condition

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.