Muscle wasting and atrophy, NEC, right shoulder

This code signifies a reduction in muscle mass and size in the right shoulder, not due to a specific neurological disease, disuse, or other classified causes. It indicates a generalized or idiopathic muscle atrophy affecting the musculature of the right shoulder girdle.

Apply this code when documentation specifies muscle wasting or atrophy of the right shoulder without an underlying neurological condition (e.g., poliomyelitis, motor neuron disease) or a clear cause like disuse. It is appropriate for cases where the atrophy is localized to the right shoulder and the etiology is either unknown or not classifiable elsewhere.

• Ensure documentation explicitly states "right shoulder" to support laterality.
• Distinguish from disuse atrophy (M62.50) or atrophy due to specific neurological conditions (e.g., G71.0-).
• Always look for an underlying cause; if identified, code that primary condition first, and M62.511 may be a secondary diagnosis.