Separation of muscle (nontraumatic), right upper arm

This code signifies a spontaneous or atraumatic detachment of muscle fibers from their origin or insertion, specifically located in the right upper arm. This condition is not due to an acute injury or external force but rather a degenerative process or underlying systemic issue affecting muscle integrity.

Utilize this code when documentation clearly indicates a non-traumatic separation or rupture of a muscle in the patient's right upper arm. This typically involves conditions like muscle avulsion due to chronic stress, degenerative myopathy, or spontaneous rupture without a history of direct trauma. Supporting documentation should specify the laterality and the non-traumatic nature of the muscle separation.

• Ensure documentation explicitly states "nontraumatic" or "spontaneous" to differentiate from traumatic muscle tears (S46.xxx codes).
• Verify the specific muscle involved in the right upper arm if possible, though this code is general for the region.
• Consider sequencing this code with any underlying systemic conditions (e.g., inflammatory myopathies) that may predispose to spontaneous muscle separation.