Nontraumatic ischemic infarction of muscle, left shoulder

This code signifies a condition where muscle tissue in the left shoulder experiences necrosis due to a lack of blood supply, not caused by an external injury. This ischemic event leads to muscle cell death and impaired function in the affected area.

Apply this code when documentation clearly indicates a diagnosis of muscle infarction in the left shoulder that is not attributed to trauma. This typically arises from conditions like vasculitis, embolism, or compartment syndrome, and requires physician documentation specifying the non-traumatic etiology and affected side.

• Ensure documentation explicitly states "nontraumatic" and specifies the "left shoulder" to support this code.
• Differentiate from traumatic muscle injuries (S4x.xxx codes) or other myopathies not involving infarction.
• Consider sequencing this code after the underlying cause of the ischemia, if known and documented (e.g., an embolism).