M20 Acquired deformities of fingers and toes
ICD-10-CM category M20 sits in Chapter 13 (Diseases of the musculoskeletal system and connective tissue, M00-M99). It contains 33 billable codes for FY2027, effective October 1, 2026 to September 30, 2027. Always code to the most specific code available: a code with more characters that describes the diagnosis more precisely takes priority over a shorter one.
Subcategories
M20.0 Deformity of finger(s)M20.00 Unspecified deformity of finger(s)M20.01 Mallet fingerM20.02 Boutonniere deformityM20.03 Swan-neck deformityM20.09 Other deformity of finger(s)M20.1 Hallux valgus (acquired)M20.2 Hallux rigidusM20.3 Hallux varus (acquired)M20.4 Other hammer toe(s) (acquired)M20.5 Other deformities of toe(s) (acquired)M20.5X Other deformities of toe(s) (acquired)M20.6 Acquired deformities of toe(s), unspecified
Billable codes in M20
| Code | Description |
|---|---|
M20.001 | Unspecified deformity of right finger(s) |
M20.002 | Unspecified deformity of left finger(s) |
M20.009 | Unspecified deformity of unspecified finger(s) |
M20.011 | Mallet finger of right finger(s) |
M20.012 | Mallet finger of left finger(s) |
M20.019 | Mallet finger of unspecified finger(s) |
M20.021 | Boutonniere deformity of right finger(s) |
M20.022 | Boutonniere deformity of left finger(s) |
M20.029 | Boutonniere deformity of unspecified finger(s) |
M20.031 | Swan-neck deformity of right finger(s) |
M20.032 | Swan-neck deformity of left finger(s) |
M20.039 | Swan-neck deformity of unspecified finger(s) |
M20.091 | Other deformity of right finger(s) |
M20.092 | Other deformity of left finger(s) |
M20.099 | Other deformity of finger(s), unspecified finger(s) |
M20.10 | Hallux valgus (acquired), unspecified foot |
M20.11 | Hallux valgus (acquired), right foot |
M20.12 | Hallux valgus (acquired), left foot |
M20.20 | Hallux rigidus, unspecified foot |
M20.21 | Hallux rigidus, right foot |
M20.22 | Hallux rigidus, left foot |
M20.30 | Hallux varus (acquired), unspecified foot |
M20.31 | Hallux varus (acquired), right foot |
M20.32 | Hallux varus (acquired), left foot |
M20.40 | Other hammer toe(s) (acquired), unspecified foot |
M20.41 | Other hammer toe(s) (acquired), right foot |
M20.42 | Other hammer toe(s) (acquired), left foot |
M20.5X1 | Other deformities of toe(s) (acquired), right foot |
M20.5X2 | Other deformities of toe(s) (acquired), left foot |
M20.5X9 | Other deformities of toe(s) (acquired), unspecified foot |
M20.60 | Acquired deformities of toe(s), unspecified, unspecified foot |
M20.61 | Acquired deformities of toe(s), unspecified, right foot |
M20.62 | Acquired deformities of toe(s), unspecified, left foot |
Search within ICD-10-CM for M20 and related codes