Arthropathy in neoplastic disease

This code describes joint disease that arises as a direct or indirect consequence of a neoplastic process. This can include paraneoplastic arthropathy, hypertrophic osteoarthropathy, or other joint manifestations directly attributable to the presence of a tumor, rather than metastatic involvement of the joint itself.

Use this code when documentation clearly links a patient's arthropathy to an underlying malignancy. This typically applies when the joint symptoms are a systemic effect of the cancer, such as in cases of paraneoplastic syndromes or hypertrophic pulmonary osteoarthropathy associated with lung cancer. The medical record should specify the neoplastic disease and the associated arthropathy.

• Always code the underlying neoplastic disease first, followed by this code to show the causal relationship.
• Distinguish this from metastatic disease to the joint (e.g., C79.51, C79.52), which involves direct tumor invasion.
• Ensure documentation specifies the type of arthropathy if known (e.g., hypertrophic osteoarthropathy) and its connection to the neoplasm.