Athscl native arteries of extrm w rest pain, unsp extremity

This code signifies a chronic condition where plaque buildup narrows the native arteries in an unspecified limb, leading to pain even at rest. This indicates severe peripheral artery disease (PAD) affecting the lower or upper extremities, characterized by insufficient blood flow to meet metabolic demands, even without exertion.

Apply this code when documentation confirms atherosclerosis of a native artery in an extremity, and the patient experiences rest pain. This diagnosis is typically supported by clinical findings such as dependent rubor, pallor on elevation, non-healing ulcers, or gangrene, along with imaging studies confirming arterial narrowing.

• Ensure documentation explicitly states "rest pain" to differentiate from claudication (I70.21-).
• If the specific extremity (right, left, bilateral) is known, use a more specific code from the I70.22- series.
• Code any associated complications, such as ulceration (L97.-) or gangrene (I96), as secondary diagnoses.