ICD-10 · PDGM grouping
F91 Conduct disorders
All 6 codes in the F91 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
6
Can lead a claim
5
Cannot lead a claim
1
What CMS assigns to F91
5 of the 6 codes group to Behavioral Health; 1 is assigned no clinical group. None of the 6 is assigned a comorbidity subgroup. 5 of the 6 can lead a claim.
Every code in F91
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| F91.0 | Conduct disorder confined to family context | Can lead a claim | F | None |
| F91.1 | Conduct disorder, childhood-onset type | Can lead a claim | F | None |
| F91.2 | Conduct disorder, adolescent-onset type | Can lead a claim | F | None |
| F91.3 | Oppositional defiant disorder | Can lead a claim | F | None |
| F91.8 | Other conduct disorders | Can lead a claim | F | None |
| F91.9 | Conduct disorder, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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