M20Acquired deformities of fingers and toes

M20 is the ICD-10-CM diagnosis code for acquired deformities of fingers and toes. It belongs to block M20-M25 (other joint disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M20.0 (finger(s)), M20.1 ((acquired)), M20.2 (rigidus), M20.3 ((acquired)), M20.4 ((acquired)), M20.5 ((acquired)) and M20.6 (unspecified).

Don't report M20 together with the conditions in its Excludes1 note: acquired absence of fingers and toes (Z89.-), congenital absence of fingers and toes (Q71.3-, Q72.3-) and congenital deformities and malformations of fingers and toes (Q66.-, Q68-Q70, Q74.-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.