M20.3Hallux varus (acquired)

M20.3 is the ICD-10-CM diagnosis code for Hallux varus (acquired). It belongs to category M20 (acquired deformities of fingers and toes), 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 3 subcodes must be used instead.

Within M20 (acquired deformities of fingers and toes), M20.3 is specifically for Hallux varus (acquired). Related codes cover deformity of finger(s) (M20.0), Hallux valgus (acquired) (M20.1), Hallux rigidus (M20.2), other hammer toe(s) (acquired) (M20.4), other deformities of toe(s) (acquired) (M20.5) and acquired deformities of toe(s), unspecified (M20.6).

To report this condition, pick the subcode that matches the documentation: M20.30 (unspecified foot), M20.31 (right foot) and M20.32 (left foot).

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