M12.8Other specific arthropathies, not elsewhere classified

M12.8 is the ICD-10-CM diagnosis code for other specific arthropathies, not elsewhere classified. It belongs to category M12 (other and unspecified arthropathy), block M05-M14 (inflammatory polyarthropathies) 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 10 subcodes must be used instead.

Within M12, choose M12.8 (Other specific arthropathies, not elsewhere classified) only when documentation doesn't support a more specific option: chronic postrheumatic arthropathy [Jaccoud] (M12.0), Kaschin-Beck disease (M12.1), Villonodular synovitis (pigmented) (M12.2), Palindromic rheumatism (M12.3), intermittent hydrarthrosis (M12.4), traumatic arthropathy (M12.5) and arthropathy, unspecified (M12.9).

To report this condition, pick the subcode that matches the documentation: M12.80 (unspecified site), M12.81 (shoulder), M12.82 (elbow), M12.83 (wrist), M12.84 (hand), M12.85 (hip), M12.86 (knee), M12.87 (ankle and foot) and 2 more.

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