M67.9Unspecified disorder of synovium and tendon

M67.9 is the ICD-10-CM diagnosis code for unspecified disorder of synovium and tendon. It belongs to category M67 (other disorders of synovium and tendon), block M65-M67 (disorders of synovium and tendon) 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 M67, choose M67.9 (Unspecified disorder of synovium and tendon) only when documentation doesn't support a more specific option: short Achilles tendon (acquired) (M67.0), Synovial hypertrophy, not elsewhere classified (M67.2), transient synovitis (M67.3), ganglion (M67.4), Plica syndrome (M67.5), other specified disorders of synovium and tendon (M67.8) and plantar fasciitis (M67.A).

To report this condition, pick the subcode that matches the documentation: M67.90 (unspecified site), M67.91 (shoulder), M67.92 (upper arm), M67.93 (forearm), M67.94 (hand), M67.95 (thigh), M67.96 (lower leg), M67.97 (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.