Osteitis deformans in neoplastic diseases, left hand

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

Use this code when documentation clearly states osteitis deformans of the left hand and explicitly links its etiology to a co-existing neoplastic disease. This typically applies when imaging or biopsy confirms Paget's disease in the left hand and the physician's assessment attributes it to the patient's cancer.

• Always sequence the underlying neoplastic disease code first, as it is the primary etiology.
• Ensure documentation specifies "left hand" and the causal link to a neoplastic process; do not use for idiopathic Paget's disease.
• Distinguish from other forms of secondary osteitis deformans or localized bone metastases, which would be coded differently.