Hypertrophy of bone, unspecified ulna and radius

This code signifies an abnormal enlargement or overgrowth of bone tissue affecting both the ulna and radius, without further specification of the type of hypertrophy. It indicates a non-neoplastic increase in bone mass in the forearm.

Apply this code when documentation clearly states "hypertrophy of ulna and radius" without specifying laterality (e.g., right, left, bilateral) or the specific type of hypertrophy (e.g., post-traumatic, osteochondromatous). This code is appropriate when the physician's notes describe an increase in bone density or size in the forearm bones that is not attributed to a tumor or other specific bone disease.

• Avoid using this code if laterality (right, left, bilateral) is documented; instead, choose a more specific code from the M89.33 series.
• Ensure the documentation specifies "hypertrophy" and not other bone conditions like osteosclerosis or exostosis, which have distinct codes.
• Query the provider for more specific details regarding the type of hypertrophy or affected side if available in the clinical notes but not explicitly stated.