ICD-10-CM code F21 describes schizotypal disorder. Enduring pattern of eccentric behavior, cognitive/perceptual distortions, and discomfort with close relationships. It is a billable, specific code valid for claim submission. It is grouped under the “Schizophrenia Spectrum & Psychotic Disorders” section of the mental, behavioral, and neurodevelopmental disorders chapter.
When to use F21
Use this group for schizophrenia, schizoaffective disorder, delusional disorder, brief psychotic disorder, and other non-substance psychoses. Choose the subtype and current-state modifiers that the documentation supports. For F21 specifically, enduring pattern of eccentric behavior, cognitive/perceptual distortions, and discomfort with close relationships.
Documentation & billing
Document the subtype, the presence of psychotic features, and the current episode state. Confirm the psychosis is not substance-induced or due to a medical condition before assigning an F20–F29 code.
Common pitfalls
- Using unspecified psychosis (F29) when criteria for a specific disorder are met.
- Failing to distinguish schizoaffective disorder from schizophrenia with mood symptoms.
- Coding substance-induced or medical-condition psychosis under F20–F29.
Common search terms for F21
Clinicians often look up F21 using plain-language terms. This code maps to:
Frequently asked questions
What is ICD-10-CM code F21?
Schizotypal disorder. Enduring pattern of eccentric behavior, cognitive/perceptual distortions, and discomfort with close relationships.
Is F21 a billable ICD-10-CM code?
Yes. F21 (Schizotypal disorder) is a billable, specific ICD-10-CM code that can be reported on a claim. Confirm the current official descriptor against the CDC code set and your payer’s policies before submitting.
What should I document to support F21?
Document the subtype, the presence of psychotic features, and the current episode state. Confirm the psychosis is not substance-induced or due to a medical condition before assigning an F20–F29 code.