Hypertrophy of bone, unspecified tibia and fibula

This code signifies an abnormal enlargement or overgrowth of bone tissue affecting the lower leg, specifically the tibia and fibula, without a more precise anatomical location specified. This hypertrophy is a non-neoplastic condition where bone mass increases beyond normal limits.

Apply this code when documentation indicates bone hypertrophy of the tibia and fibula, but the specific bone (tibia or fibula) or laterality (left, right, bilateral) is not clearly stated. This code is appropriate when imaging reports or physician notes confirm bone overgrowth in the lower leg without further detail.

• Avoid using this code if laterality (left, right, bilateral) or the specific bone (tibia or fibula) is documented; instead, use a more specific code from the M89.36- subcategory.
• Ensure the documentation clearly states "hypertrophy of bone" and not other bone conditions like osteosclerosis or osteophytes, which have different codes.
• This code should be used as a last resort when more specific anatomical or laterality information is unavailable.