I70.322 Atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, left leg

ICD-10-CM I70.322: Atherosclerosis of Unspecified Type of Bypass Graft(s) of the Extremities with Rest Pain, Left Leg

ICD-10-CM code I70.322 represents atherosclerosis of an unspecified type of extremity bypass graft with rest pain in the left leg. The concept is an active disease or syndrome designation. Bypass grafts in the lower limbs can develop accelerated atherosclerosis, and ischemic rest pain involves burning or numbness in the foot. This code appears in payer coding articles. 1 2 6 4

Plain-language overview

This diagnosis code identifies a disease or syndrome involving atherosclerosis of an unspecified type of extremity bypass graft, with the condition involving rest pain in the left leg. 1

Lower limb bypass grafts can develop a structurally distinct, rapidly progressive form of atherosclerosis that differs from spontaneous atherosclerosis. 2

Ischemic rest pain involves burning pain or numbness in the forefoot that typically occurs soon after falling asleep, distinct from exercise-induced claudication. 6

What this code represents

The official active label for I70.322 is atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, left leg, classified as a disease or syndrome. 1

Code I70.322 is a narrower concept under the parent code I70.32, which denotes atherosclerosis of unspecified type of extremity bypass grafts with rest pain. 1

Coding details

The ICD-10-CM terminology distinguishes I70.322 for the left leg from adjacent codes specifying the right leg, bilateral legs, or unspecified extremities for the same graft pathology. 3

Documentation considerations

Clinical reference material defines ischemic rest pain as burning pain or numbness in the forefoot occurring soon after falling asleep, distinguishing it from intermittent claudication. 6

Coverage and utilization context

The I70.322 diagnosis code appears in a Medicare billing and coding article concerning foot care, establishing its use within administrative billing contexts. 4

What the sources add

While the terminology record defines the disease classification, clinical literature explains that autologous venous grafts face high failure rates due to accelerated atherosclerosis, providing operational context for this diagnosis. 1 2

Sources

1. ICD-10-CM I70.322 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-27.
3. Phecode 440 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-27.
4. Article - Billing and Coding: Foot Care (A56232) — cms.gov; accessed 2026-07-27.
5. Article - Billing and Coding: Non-Invasive Peripheral Arterial Vascular Studies (A57593) — cms.gov; accessed 2026-07-27.
6. Lower Extremity Peripheral Artery Disease: Diagnosis and Treatment — aafp.org; accessed 2026-07-27.