F20.3
ICD-10BillableUndifferentiated schizophrenia
Official ICD-10-CM descriptor (FY2026)
Undifferentiated schizophrenia
F20.3 is valid for submission on a claim — CMS flags it as a billable, specific code.
Inclusion terms
- Atypical schizophrenia
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- acute schizophrenia-like psychotic disorder (F23)
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- post-schizophrenic depression (F32.89)
Related codes in F20
Where this code sits
- Parent code
- F20
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.