Muscle wasting and atrophy, NEC, unsp upper arm

This code signifies a reduction in muscle mass and size in an unspecified upper arm, not due to a specific neurological disease or other classified condition. It indicates a generalized loss of muscle tissue in the upper arm, without a more precise etiology or laterality being documented.

Use this code when documentation indicates muscle wasting or atrophy in the upper arm, but the specific cause is not identified or is not classifiable elsewhere. This code is appropriate when the medical record does not specify whether the condition affects the right or left upper arm.

• Avoid using this code if a more specific cause of muscle atrophy (e.g., disuse, neurogenic) is documented; look for codes within categories G70-G73 or M62.2-.
• Ensure documentation clearly states "unspecified upper arm" or lacks laterality to support this code. If laterality is specified, use M62.521 (right) or M62.522 (left).
• Always review the medical record for any underlying conditions that may be contributing to the muscle wasting, and code those conditions first if they are the primary diagnosis.