I70.33 Atherosclerosis of unspecified type of bypass graft(s) of the right leg with ulceration

ICD-10-CM I70.33: Atherosclerosis of unspecified type of bypass graft(s) of the right leg with ulceration

ICD-10-CM code I70.33 denotes atherosclerosis of an unspecified type of bypass graft in the right leg when ulceration is present. Public sources identify this diagnosis code and list more specific clinical variants detailing ulcer locations like the thigh or calf. Medicare wound care articles include related diagnosis codes, while terminology authorities confirm the code's official description and hierarchical structure. 1 2 3 4 5 6

Plain-language overview

Code I70.33 represents a diagnosis of atherosclerosis affecting an unspecified type of bypass graft in the right leg, specifically when this condition is accompanied by ulceration. 1 6

What this code represents

The I70.33 diagnosis code functions as a broader category, encompassing more specific clinical variants that detail the exact anatomical site of the right leg ulceration. 1 4 5

Coding details

Source S1 lists specific child variants under this code, including atherosclerosis of unspecified type of bypass grafts of the right leg with ulceration of the thigh and calf. 1

Additional anatomical sites specified under this code include ulceration of the ankle, heel and midfoot, other parts of the foot, and other parts of the lower leg. 1

Documentation considerations

The existence of an unspecified site variant, I70.339, is listed in the sources alongside variants for specific right leg anatomical locations. 1

Coverage and utilization context

Medicare wound care billing and coding articles list related atherosclerosis diagnosis codes with ulceration, such as I70.342 for the left leg and I70.332 for the right leg. 2 3

What the sources add

Terminology authorities from the National Cancer Institute and the National Library of Medicine publish the official description and hierarchical structure for the I70.33 code. 4 5

While a university phecode database lists the right leg variants, CMS billing articles place similar left and right leg atherosclerosis with ulceration codes within wound care contexts. 1 2 3

Questions to verify

The supplied sources do not establish whether clinical documentation must specify the graft material or the exact ulcer site to select the most accurate billable child code. 1 4 5

Sources

1. Phecode 440 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-26.
2. Article - Billing and Coding: Wound Care (A55909) — cms.gov; accessed 2026-07-26.
3. Article - Billing and Coding: Wound Care (A55909) — cms.gov; accessed 2026-07-26.
4. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-26.
5. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-26.
6. ICD-10 Codes for Atherosclerosis — outsourcestrategies.com; accessed 2026-07-26.