Is M20 a billable code?
No. M20 is a header code that groups 33 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
M20: Acquired deformities of fingers and toes
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
M20 groups related diagnoses under acquired deformities of fingers and toes. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
Billable codes under 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
M20 questions
What does M20 mean?
M20 is the ICD-10-CM code for Acquired deformities of fingers and toes. It is in chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.