Nontraumatic ischemic infarction of muscle, unspecified site

This code signifies the death of muscle tissue due to a lack of blood supply, not caused by an injury. It represents a condition where muscle cells are damaged and die because they are deprived of oxygen and nutrients, without a specific anatomical location identified. This is distinct from muscle damage caused by trauma or other inflammatory processes.

Use this code when documentation clearly indicates a diagnosis of muscle infarction due to ischemia, and the specific muscle or anatomical site affected is not specified. This typically occurs when diagnostic imaging or biopsy confirms muscle necrosis of ischemic origin, but the precise location is either unknown or not recorded. It is appropriate when more specific codes for muscle infarction of a particular site (e.g., M62.21-M62.29) cannot be assigned.

• Only use this code when the documentation explicitly states "unspecified site." If a specific muscle group or limb is mentioned, a more granular code from the M62.2x series should be used.
• Differentiate from rhabdomyolysis (M62.82), which is muscle breakdown, not necessarily infarction due to ischemia.
• Always look for an underlying cause of the ischemia (e.g., peripheral artery disease, embolism) and code it as a primary or secondary diagnosis as appropriate.