M88.85Osteitis deformans of thigh

M88.85 is the ICD-10-CM diagnosis code for Osteitis deformans of thigh. It belongs to category M88 (Osteitis deformans [Paget's disease of bone]), block M86-M90 (other osteopathies) 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 M88.8 (Osteitis deformans of other bones), M88.85 is specifically for Osteitis deformans of thigh. Related codes cover shoulder (M88.81), upper arm (M88.82), forearm (M88.83), hand (M88.84), lower leg (M88.86), ankle and foot (M88.87), other bones (M88.88) and multiple sites (M88.89).

To report this condition, pick the subcode that matches the documentation: M88.851 (thigh), M88.852 (thigh) and M88.859 (thigh).

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