Other hypertrophic osteoarthropathy, multiple sites

This code signifies a generalized condition characterized by abnormal bone and joint enlargement, often accompanied by clubbing of the digits, that affects multiple anatomical locations. It represents a secondary form of osteoarthropathy, typically arising from an underlying systemic disease.

Apply this code when documentation specifies hypertrophic osteoarthropathy impacting more than one distinct site, such as both upper and lower extremities, or axial and appendicular skeleton involvement. Supporting documentation should clearly indicate the hypertrophic nature of the bone and joint changes and their widespread distribution.

• Always code the underlying condition causing the hypertrophic osteoarthropathy first, if known.
• Distinguish from localized hypertrophic osteoarthropathy (M89.40-M89.48) which affects a single site.
• Ensure documentation specifies "multiple sites" or lists several affected areas to justify this code.