M67.4Ganglion

M67.4 is the ICD-10-CM diagnosis code for ganglion. 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 (other disorders of synovium and tendon), M67.4 is specifically for ganglion. Related codes cover short Achilles tendon (acquired) (M67.0), Synovial hypertrophy, not elsewhere classified (M67.2), transient synovitis (M67.3), Plica syndrome (M67.5), other specified disorders of synovium and tendon (M67.8), unspecified disorder of synovium and tendon (M67.9) and plantar fasciitis (M67.A).

To report this condition, pick the subcode that matches the documentation: M67.40 (unspecified site), M67.41 (shoulder), M67.42 (elbow), M67.43 (wrist), M67.44 (hand), M67.45 (hip), M67.46 (knee), M67.47 (ankle and foot) and 2 more.

Don't report M67.4 together with the conditions in its Excludes1 note: ganglion in yaws (A66.6).

The conditions in its Excludes2 note aren't part of M67.4, but may be coded alongside it if the patient has both: cyst of bursa (M71.2-M71.3) and cyst of synovium (M71.2-M71.3).

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