ICD-10 · PDGM grouping
M20 Acquired deformities of fingers and toes
All 33 codes in the M20 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
33
Can lead a claim
18
Cannot lead a claim
15
What CMS assigns to M20
18 of the 33 codes group to MMTA - Other; 15 are assigned no clinical group. None of the 33 is assigned a comorbidity subgroup. 18 of the 33 can lead a claim.
Every code in M20
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 |
|---|---|---|---|---|
| M20.0 Deformity of finger(s) | ||||
| M20.00 Unspecified deformity of finger(s) | ||||
| M20.001 | Unspecified deformity of right finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.002 | Unspecified deformity of left finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.009 | Unspecified deformity of unspecified finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.01 Mallet finger | ||||
| M20.011 | Mallet finger of right finger(s) | Can lead a claim | A | None |
| M20.012 | Mallet finger of left finger(s) | Can lead a claim | A | None |
| M20.019 | Mallet finger of unspecified finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.02 Boutonniere deformity | ||||
| M20.021 | Boutonniere deformity of right finger(s) | Can lead a claim | A | None |
| M20.022 | Boutonniere deformity of left finger(s) | Can lead a claim | A | None |
| M20.029 | Boutonniere deformity of unspecified finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.03 Swan-neck deformity | ||||
| M20.031 | Swan-neck deformity of right finger(s) | Can lead a claim | A | None |
| M20.032 | Swan-neck deformity of left finger(s) | Can lead a claim | A | None |
| M20.039 | Swan-neck deformity of unspecified finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.09 Other deformity of finger(s) | ||||
| M20.091 | Other deformity of right finger(s) | Can lead a claim | A | None |
| M20.092 | Other deformity of left finger(s) | Can lead a claim | A | None |
| M20.099 | Other deformity of finger(s), unspecified finger(s) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.1 Hallux valgus (acquired) | ||||
| M20.10 | Hallux valgus (acquired), unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.11 | Hallux valgus (acquired), right foot | Can lead a claim | A | None |
| M20.12 | Hallux valgus (acquired), left foot | Can lead a claim | A | None |
| M20.2 Hallux rigidus | ||||
| M20.20 | Hallux rigidus, unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.21 | Hallux rigidus, right foot | Can lead a claim | A | None |
| M20.22 | Hallux rigidus, left foot | Can lead a claim | A | None |
| M20.3 Hallux varus (acquired) | ||||
| M20.30 | Hallux varus (acquired), unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.31 | Hallux varus (acquired), right foot | Can lead a claim | A | None |
| M20.32 | Hallux varus (acquired), left foot | Can lead a claim | A | None |
| M20.4 Other hammer toe(s) (acquired) | ||||
| M20.40 | Other hammer toe(s) (acquired), unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.41 | Other hammer toe(s) (acquired), right foot | Can lead a claim | A | None |
| M20.42 | Other hammer toe(s) (acquired), left foot | Can lead a claim | A | None |
| M20.5 Other deformities of toe(s) (acquired) | ||||
| M20.5X Other deformities of toe(s) (acquired) | ||||
| M20.5X1 | Other deformities of toe(s) (acquired), right foot | Can lead a claim | A | None |
| M20.5X2 | Other deformities of toe(s) (acquired), left foot | Can lead a claim | A | None |
| M20.5X9 | Other deformities of toe(s) (acquired), unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.6 Acquired deformities of toe(s), unspecified | ||||
| M20.60 | Acquired deformities of toe(s), unspecified, unspecified footCMS: Acquired deformities of toe(s), unsp, unspecified foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.61 | Acquired deformities of toe(s), unspecified, right foot | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| M20.62 | Acquired deformities of toe(s), unspecified, left foot | 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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