Other rupture of muscle (nontraumatic), left upper arm

This code signifies a non-traumatic tear or complete separation of muscle fibers within the left upper arm. This condition typically results from degenerative processes, overuse, or spontaneous events rather than an acute external injury.

Apply this code when documentation clearly indicates a spontaneous or non-traumatic rupture of a muscle in the patient's left upper arm. Supporting documentation should specify the non-traumatic etiology and the affected anatomical location (e.g., biceps rupture, triceps rupture, deltoid rupture, all non-traumatic).

• Differentiate carefully between traumatic (S46.-) and non-traumatic (M62.1-) muscle ruptures; the etiology is key.
• Ensure the documentation specifies "left upper arm" to avoid laterality or anatomical site errors.
• Do not use this code for muscle strains or sprains without evidence of a complete rupture.