ICD-10-CM category
M20 Acquired deformities of fingers and toes
M20 is a category, not a billable code. Report one of the 33 complete codes below.
Codes in M20
- M20.001Unspecified deformity of right finger(s)
- M20.002Unspecified deformity of left finger(s)
- M20.009Unspecified deformity of unspecified finger(s)
- M20.011Mallet finger of right finger(s)
- M20.012Mallet finger of left finger(s)
- M20.019Mallet finger of unspecified finger(s)
- M20.021Boutonniere deformity of right finger(s)
- M20.022Boutonniere deformity of left finger(s)
- M20.029Boutonniere deformity of unspecified finger(s)
- M20.031Swan-neck deformity of right finger(s)
- M20.032Swan-neck deformity of left finger(s)
- M20.039Swan-neck deformity of unspecified finger(s)
- M20.091Other deformity of right finger(s)
- M20.092Other deformity of left finger(s)
- M20.099Other deformity of finger(s), unspecified finger(s)
- M20.10Hallux valgus (acquired), unspecified foot
- M20.11Hallux valgus (acquired), right foot
- M20.12Hallux valgus (acquired), left foot
- M20.20Hallux rigidus, unspecified foot
- M20.21Hallux rigidus, right foot
- M20.22Hallux rigidus, left foot
- M20.30Hallux varus (acquired), unspecified foot
- M20.31Hallux varus (acquired), right foot
- M20.32Hallux varus (acquired), left foot
- M20.40Other hammer toe(s) (acquired), unspecified foot
- M20.41Other hammer toe(s) (acquired), right foot
- M20.42Other hammer toe(s) (acquired), left foot
- M20.5X1Other deformities of toe(s) (acquired), right foot
- M20.5X2Other deformities of toe(s) (acquired), left foot
- M20.5X9Other deformities of toe(s) (acquired), unspecified foot
- M20.60Acquired deformities of toe(s), unspecified, unspecified foot
- M20.61Acquired deformities of toe(s), unspecified, right foot
- M20.62Acquired deformities of toe(s), unspecified, left foot
Outside the US? M20 in the international WHO ICD-10 lists its inclusion and exclusion notes.
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ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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