Osteitis deformans in neoplastic diseases, right thigh

This code signifies Paget's disease of bone (osteitis deformans) occurring as a secondary manifestation of a neoplastic process, specifically affecting the right thigh. It indicates a pathological bone remodeling disorder linked to an underlying malignancy, rather than primary Paget's disease.

Apply this code when documentation clearly links osteitis deformans in the right thigh to a co-existing neoplastic disease. This typically involves imaging findings consistent with Paget's disease in the specified anatomical site, coupled with a confirmed diagnosis of cancer.

• Always code the underlying neoplastic disease first, as this condition is secondary.
• Ensure documentation specifies "right thigh" and a causal link to a neoplastic process.
• Distinguish from primary Paget's disease (M88.-) which is not associated with a neoplastic etiology.