Osteitis deformans in neoplastic diseases, left shoulder

This code signifies Paget's disease of bone (osteitis deformans) occurring as a complication or manifestation of a neoplastic disease, specifically affecting the left shoulder. It indicates a secondary form of Paget's disease, where the bone remodeling disorder is linked to an underlying malignancy.

Use this code when documentation clearly links Paget's disease of the left shoulder to a co-existing neoplastic process. This typically applies when the neoplasm is identified as the cause or contributing factor to the osteitis deformans. Supporting documentation would include pathology reports, imaging studies, and physician notes detailing the relationship between the cancer and the bone condition.

• Always sequence the underlying neoplastic disease code first, followed by this code, to show the causal relationship.
• Ensure the documentation specifies "left shoulder" to justify this specific laterality.
• Distinguish from primary Paget's disease (M88.-) which is not associated with neoplastic disease.