I70.321 — Atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, right leg
I70.321 is a billable, specific ICD-10-CM code for atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, right leg. It is valid for submission on a claim.
Excludes1 inherited from the categories above I70.321
These are not written on I70.321, but they bind it: a note on a category applies to every code beneath it. Billing I70.321 with anything listed here is a denial.
Excludes2 inherited from the categories above I70.321
Also inherited, and the opposite of Excludes1: these conditions are not part of I70.321, but a patient can have both, so you may code both.
Written on I70 — Atherosclerosis
Other codes that can never be billed with I70.321
These codes carry an Excludes1 note pointing at I70.321. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I70.321 alone.
- I77.6Arteritis, unspecified
Risk adjustment
I70.321 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 264 Vascular Disease with Complications0.455 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
I70.321 is named in 16 Medicare coverage policies — 16 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56232Billing and Coding: Foot Care
- A56476Billing and Coding: Cardiac Radionuclide Imaging
- A56675Billing and Coding: Homocysteine Level, Serum
- A56680Billing and Coding: Routine Foot Care
How I70.321 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to I70.321.
- Arteriosclerosis, arteriosclerotic›with›critical limb ischemia›bypass graft›leg›right
- Arteriosclerosis, arteriosclerotic›extremities›bypass graft›leg›right›with›rest pain(and intermittent claudication)
- Arteriosclerosis, arteriosclerotic›with›critical limb ischemia›bypass graft›leg›right›with›rest pain(and intermittent claudication)
Code history
I70.321 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share I70.32. If I70.321 is not quite right, the correct code is usually one of these.
- I70.322Atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, left leg
- I70.323Atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, bilateral legs
- I70.328Atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, other extremity
- I70.329Atherosclerosis of unspecified type of bypass graft(s) of the extremities with rest pain, unspecified extremity
Questions about I70.321
- Is I70.321 a billable ICD-10-CM code?
- Yes. I70.321 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I70.321 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).
- What cannot be coded together with I70.321?
- I70.321 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above I70.321 (I70.3) and apply to it just the same.