M19.04Primary osteoarthritis, hand

M19.04 is the ICD-10-CM diagnosis code for primary osteoarthritis, hand. It belongs to category M19 (other and unspecified osteoarthritis), block M15-M19 (osteoarthritis) 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 M19.0 (primary osteoarthritis of other joints), M19.04 is specifically for primary osteoarthritis, hand. Related codes cover osteoarthritis, shoulder (M19.01), osteoarthritis, elbow (M19.02), osteoarthritis, wrist (M19.03), osteoarthritis ankle and foot (M19.07) and osteoarthritis, other specified site (M19.09).

To report this condition, pick the subcode that matches the documentation: M19.041 (hand), M19.042 (hand) and M19.049 (hand).

The conditions in its Excludes2 note aren't part of M19.04, but may be coded alongside it if the patient has both: primary osteoarthritis of first carpometacarpal joint (M18.0-, M18.1-).

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