ICD-10 · PDGM grouping
M22 Disorder of patella
All 21 codes in the M22 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
21
Can lead a claim
14
Cannot lead a claim
7
What CMS assigns to M22
14 of the 21 codes group to Musculoskeletal Rehabilitation; 7 are assigned no clinical group. None of the 21 is assigned a comorbidity subgroup. 14 of the 21 can lead a claim.
Every code in M22
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 |
|---|---|---|---|---|
| M22.0 Recurrent dislocation of patella | ||||
| M22.00 | Recurrent dislocation of patella, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.01 | Recurrent dislocation of patella, right knee | Can lead a claim | E | None |
| M22.02 | Recurrent dislocation of patella, left knee | Can lead a claim | E | None |
| M22.1 Recurrent subluxation of patella | ||||
| M22.10 | Recurrent subluxation of patella, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.11 | Recurrent subluxation of patella, right knee | Can lead a claim | E | None |
| M22.12 | Recurrent subluxation of patella, left knee | Can lead a claim | E | None |
| M22.2 Patellofemoral disorders | ||||
| M22.2X Patellofemoral disorders | ||||
| M22.2X1 | Patellofemoral disorders, right knee | Can lead a claim | E | None |
| M22.2X2 | Patellofemoral disorders, left knee | Can lead a claim | E | None |
| M22.2X9 | Patellofemoral disorders, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.3 Other derangements of patella | ||||
| M22.3X Other derangements of patella | ||||
| M22.3X1 | Other derangements of patella, right knee | Can lead a claim | E | None |
| M22.3X2 | Other derangements of patella, left knee | Can lead a claim | E | None |
| M22.3X9 | Other derangements of patella, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.4 Chondromalacia patellae | ||||
| M22.40 | Chondromalacia patellae, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.41 | Chondromalacia patellae, right knee | Can lead a claim | E | None |
| M22.42 | Chondromalacia patellae, left knee | Can lead a claim | E | None |
| M22.8 Other disorders of patella | ||||
| M22.8X Other disorders of patella | ||||
| M22.8X1 | Other disorders of patella, right knee | Can lead a claim | E | None |
| M22.8X2 | Other disorders of patella, left knee | Can lead a claim | E | None |
| M22.8X9 | Other disorders of patella, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.9 Unspecified disorder of patella | ||||
| M22.90 | Unspecified disorder of patella, unspecified knee | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M22.91 | Unspecified disorder of patella, right knee | Can lead a claim | E | None |
| M22.92 | Unspecified disorder of patella, left knee | Can lead a claim | E | 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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