ICD-10-CM 2027 diagnosis code
F20.3Undifferentiated schizophrenia
F20.3 is a valid, billable ICD-10-CM code for undifferentiated schizophrenia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About F20.3
F20.3 is the ICD-10-CM diagnosis code for Undifferentiated schizophrenia. It belongs to category F20 (schizophrenia), block F20-F29 (schizophrenia, schizotypal, delusional, and other non-mood psychotic disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
Within F20 (schizophrenia), F20.3 is specifically for Undifferentiated schizophrenia. Related codes cover paranoid schizophrenia (F20.0), Disorganized schizophrenia (F20.1), Catatonic schizophrenia (F20.2), residual schizophrenia (F20.5), other schizophrenia (F20.8) and unspecified (F20.9).
Don't report F20.3 together with the conditions in its Excludes1 note: acute schizophrenia-like psychotic disorder (F23).
The conditions in its Excludes2 note aren't part of F20.3, but may be coded alongside it if the patient has both: post-schizophrenic depression (F32.89).
Use an additional code, if applicable, to identify: other specified cognitive deficit (R41.84-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 885 (Psychoses, relative weight 1.3901), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 295.90 (unspecified schizophrenia, unspecified).
Coding notes
- Atypical schizophrenia
- acute schizophrenia-like psychotic disorder (F23)
- post-schizophrenic depression (F32.89)
Notes that apply from higher levels
Instructions written at a parent level also apply to F20.3.
› From F20 Schizophrenia
- code, if applicable, to identify:
- other specified cognitive deficit (R41.84-)
Broader instructions also apply from Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to F20.3.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 19 · Mental Diseases and Disorders
ICD-9-CM equivalent
Converter →- 295.90Unspecified schizophrenia, unspecifiedapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about F20.3
Is F20.3 billable?
- Yes. F20.3 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can F20.3 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict F20.3 as a principal diagnosis.
Is F20.3 a CC or MCC?
- No. F20.3 is neither a CC nor an MCC under MS-DRG v44.0.
What DRG does F20.3 group to?
- F20.3 is used in the MS-DRG v44.0 logic for MS-DRG 885 (Psychoses). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for F20.3?
- The CMS General Equivalence Mappings map F20.3 to ICD-9-CM 295.90.