ICD-10 Code I70.203 – Unspecified atherosclerosis of native arteries of extremities, bilateral legs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I70.203 – Unspecified atherosclerosis of native arteries of extremities, bilateral legs
What it is
This code identifies atherosclerosis in the native arteries of both legs when the record does not specify the exact artery or whether symptoms are present. It means plaque-related narrowing or hardening affects the lower-extremity arteries bilaterally.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include reduced leg pulses, leg pain with walking, cool extremities, or other signs of peripheral arterial disease affecting both legs.
When to use this code
Use this code when the provider documents atherosclerosis of native arteries in both lower extremities but does not name a more specific vessel or complication. It also fits when the note clearly supports bilateral leg involvement and no more specific ICD-10 option is documented. Check documentation if laterality, vessel level, or symptoms are described.
Do not use for
Do not use it for atherosclerosis limited to one leg, graft arteries, or coronary/cerebral vessels. If the chart identifies intermittent claudication, ulceration, or gangrene, choose the more specific code instead.
Coding tip
Confirm bilateral native-leg involvement and code the most specific atherosclerosis option supported by the note.