F20.3
✓ BillableUndifferentiated schizophrenia
Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
Also Known As
❌ Excludes1
directThese codes are mutually exclusive. Never code them together.
- • acute schizophrenia-like psychotic disorder (F23)
❌ Excludes1
inheritedRules inherited from parent codes in the hierarchy.
- • brief psychotic disorder (F23)
- • cyclic schizophrenia (F25.0)
- • mood [affective] disorders with psychotic symptoms (F30.2, F31.2, F31.5, F31.64, F32.3, F33.3)
- • schizoaffective disorder (F25.-)
- • schizophrenic reaction NOS (F23)
⚠️ Excludes2
directBoth codes can exist if both conditions are documented.
- • post-schizophrenic depression (F32.89)
⚠️ Excludes2
inheritedRules inherited from parent codes.
- • schizophrenic reaction in:
- • alcoholism (F10.15-, F10.25-, F10.95-)
- • brain disease (F06.2)
- • epilepsy (F06.2)
- • psychoactive drug use (F11-F19 with .15. .25, .95)
- • schizotypal disorder (F21)
📋 Code Instructions
inherited- • code, if applicable, to identify:
- • other specified cognitive deficit (R41.84-)
Clinical Description
ICD-10-CM code F20.3 represents undifferentiated schizophrenia. This code falls under the Mental, Behavioral and Neurodevelopmental disorders (F01-F99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 5-character code at the 4th level of specificity. This is the most specific code available in this subcategory. Coders should note that F20.3 has 6 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.
Frequently Asked Questions
What is ICD-10 code F20.3?
ICD-10-CM code F20.3 is "Undifferentiated schizophrenia". It belongs to the category: Mental, Behavioral and Neurodevelopmental disorders (F01-F99).
Is F20.3 a billable ICD-10 code?
Yes, F20.3 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
What codes are excluded with F20.3?
F20.3 has 6 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.
Can F20.3 be coded with other codes?
F20.3 has 7 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in F20
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)