M16.5Unilateral post-traumatic osteoarthritis of hip

M16.5 is the ICD-10-CM diagnosis code for unilateral post-traumatic osteoarthritis of hip. It belongs to category M16 (osteoarthritis of hip), 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 M16 (osteoarthritis of hip), M16.5 is specifically for unilateral post-traumatic osteoarthritis of hip. Related codes cover bilateral primary osteoarthritis of hip (M16.0), unilateral primary osteoarthritis of hip (M16.1), bilateral osteoarthritis resulting from hip dysplasia (M16.2), unilateral osteoarthritis resulting from hip dysplasia (M16.3), bilateral post-traumatic osteoarthritis of hip (M16.4), other bilateral secondary osteoarthritis of hip (M16.6), other unilateral secondary osteoarthritis of hip (M16.7) and unspecified (M16.9).

To report this condition, pick the subcode that matches the documentation: M16.50 (hip), M16.51 (hip) and M16.52 (hip).

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