ICD-10-CM 2027
ICD-10 code for finger acquired deformity
From the official ICD-10-CM alphabetic index entry “Deformity › finger (acquired)”. Page updated September 29, 2026.
About coding finger acquired deformity
The ICD-10-CM code for finger acquired deformity is M20.00 (Unspecified deformity of finger(s)). The official index lists 5 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M20.00.
Within M20.0, choose M20.00 (Unspecified deformity of finger(s)) only when documentation doesn't support a more specific option: mallet finger (M20.01), Boutonniere deformity (M20.02), Swan-neck deformity (M20.03) and other deformity of finger(s) (M20.09).
To report this condition, pick the subcode that matches the documentation: M20.001 (finger(s)), M20.002 (finger(s)) and M20.009 (finger(s)).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific finger acquired deformity codes (official index)
Common questions about finger acquired deformity ICD-10 codes
What is the ICD-10 code for finger acquired deformity?
- M20.00 — Unspecified deformity of finger(s) (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: M20.02, Q68.1, M20.01, M20.09 and others below.
What is the ICD-10 code for boutonniere finger acquired deformity?
- M20.02 — Boutonniere deformity (header code; choose a more specific subcode).
What is the ICD-10 code for congenital finger acquired deformity?
- Q68.1 — Congenital deformity of finger(s) and hand.
What is the ICD-10 code for mallet finger finger acquired deformity?
- M20.01 — Mallet finger (header code; choose a more specific subcode).
What is the ICD-10 code for swan-neck finger acquired deformity?
- M20.03 — Swan-neck deformity (header code; choose a more specific subcode).
Is M20.00 billable?
- No. M20.00 is a header code. Report one of its more specific subcodes instead.