M85.53Aneurysmal bone cyst, forearm

M85.53 is the ICD-10-CM diagnosis code for Aneurysmal bone cyst, forearm. It belongs to category M85 (other disorders of bone density and structure), block M80-M85 (disorders of bone density and structure) 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 M85.5 (Aneurysmal bone cyst), M85.53 is specifically for Aneurysmal bone cyst, forearm. Related codes cover unspecified site (M85.50), shoulder (M85.51), upper arm (M85.52), hand (M85.54), thigh (M85.55), lower leg (M85.56), ankle and foot (M85.57), other site (M85.58) and 1 more.

To report this condition, pick the subcode that matches the documentation: M85.531 (forearm), M85.532 (forearm) and M85.539 (forearm).

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