Other hypertrophic osteoarthropathy, right forearm

This code describes a non-inflammatory, degenerative joint disease affecting the right forearm, characterized by abnormal bone overgrowth and thickening of the periosteum. It represents a secondary form of osteoarthropathy, often associated with underlying systemic conditions.

Use this code for documentation indicating hypertrophic osteoarthropathy localized to the right forearm, without specifying the underlying cause. This diagnosis is typically supported by imaging studies (e.g., X-rays showing periosteal new bone formation) and clinical findings of pain, swelling, or tenderness in the affected limb.

• Ensure documentation specifies "other" hypertrophic osteoarthropathy, as opposed to primary or secondary forms with a known etiology.
• Verify the laterality is explicitly documented as "right forearm."
• Code any underlying systemic condition (e.g., lung cancer, inflammatory bowel disease) as a primary diagnosis, if known, with this code as a secondary diagnosis.