Other hypertrophic osteoarthropathy, right lower leg

This code signifies a non-specific overgrowth of bone and soft tissue in the right lower leg, not otherwise classified as primary or secondary hypertrophic osteoarthropathy. It indicates a localized or regional form of bone and periosteal proliferation affecting the tibia and/or fibula.

Apply this code when documentation specifies hypertrophic osteoarthropathy affecting the right lower leg, and the etiology is not clearly defined as primary (idiopathic) or secondary to an underlying systemic condition. This is appropriate for cases where the physician has diagnosed hypertrophic osteoarthropathy in this specific anatomical location without further specifying its type.

• Ensure documentation explicitly states "right lower leg" to support laterality.
• Do not use this code if the hypertrophic osteoarthropathy is clearly identified as primary (M89.40) or secondary (M89.41-M89.49, excluding M89.46-).
• Always review the medical record for any underlying conditions that might classify the osteoarthropathy as secondary, in which case a more specific code would be appropriate.