ICD-10 Code I70.21 – Atherosclerosis of native arteries of extremities with intermittent claudication (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.21 – Atherosclerosis of native arteries of extremities with intermittent claudication
What it is
I70.21 identifies atherosclerotic narrowing in a native artery of an arm or leg that causes intermittent claudication. Use it when the record clearly links exertional limb pain to peripheral arterial disease.
Clinical signs
Typical findings include exertional pain, cramping, or fatigue in the affected limb that improves with rest. Clinical features vary; refer to documentation, and confirm the artery is native rather than a graft or bypass.
When to use this code
Use this code when the provider documents atherosclerosis of a native extremity artery with intermittent claudication. It is appropriate for peripheral arterial disease cases where walking or activity triggers symptoms and the note specifies claudication. Check documentation for the affected limb and any laterality details.
Do not use for
Do not use this code for claudication without documented atherosclerosis, or for disease involving bypass grafts or other non-native vessels. Do not assume the diagnosis if the chart only says leg pain; check documentation.
Coding tip
Match the code only when both atherosclerosis and intermittent claudication are documented together in native extremity arteries.