Other hypertrophic osteoarthropathy, other site

This code signifies a condition characterized by abnormal bone overgrowth and joint changes that are not specified as primary hypertrophic osteoarthropathy or pachydermoperiostosis. It involves the proliferation of bone and periosteum, often associated with an underlying systemic disease, affecting a location other than the fingers, toes, or long bones.

Assign this code when documentation indicates hypertrophic osteoarthropathy affecting a site not otherwise specified or coded elsewhere, such as the skull, ribs, or vertebrae. This diagnosis typically requires physician documentation of hypertrophic osteoarthropathy and the specific affected anatomical region.

• Ensure the documentation specifies "other site" or a site not covered by more specific hypertrophic osteoarthropathy codes.
• Do not use this code if the hypertrophic osteoarthropathy is primary (familial) or pachydermoperiostosis, which have their own specific codes.
• Always code any underlying systemic condition (e.g., lung cancer, inflammatory bowel disease) that may be causing the secondary hypertrophic osteoarthropathy.