ICD-10 · PDGM grouping
M17 Osteoarthritis of knee
All 11 codes in the M17 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
11
Can lead a claim
8
Cannot lead a claim
3
What CMS assigns to M17
8 of the 11 codes group to Musculoskeletal Rehabilitation; 3 are assigned no clinical group. None of the 11 is assigned a comorbidity subgroup. 8 of the 11 can lead a claim.
Every code in M17
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 |
|---|---|---|---|---|
| M17.0 | Bilateral primary osteoarthritis of knee | Can lead a claim | E | None |
| M17.1 Unilateral primary osteoarthritis of knee | ||||
| M17.10 | Unilateral primary osteoarthritis, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M17.11 | Unilateral primary osteoarthritis, right knee | Can lead a claim | E | None |
| M17.12 | Unilateral primary osteoarthritis, left knee | Can lead a claim | E | None |
| M17.2 | Bilateral post-traumatic osteoarthritis of knee | Can lead a claim | E | None |
| M17.3 Unilateral post-traumatic osteoarthritis of knee | ||||
| M17.30 | Unilateral post-traumatic osteoarthritis, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M17.31 | Unilateral post-traumatic osteoarthritis, right knee | Can lead a claim | E | None |
| M17.32 | Unilateral post-traumatic osteoarthritis, left knee | Can lead a claim | E | None |
| M17.4 | Other bilateral secondary osteoarthritis of knee | Can lead a claim | E | None |
| M17.5 | Other unilateral secondary osteoarthritis of knee | Can lead a claim | E | None |
| M17.9 | Osteoarthritis of knee, 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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