I70.309 — Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity
I70.309 is a billable, specific ICD-10-CM code for unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, unspecified extremity. It is valid for submission on a claim.
Excludes1 inherited from the categories above I70.309
These are not written on I70.309, but they bind it: a note on a category applies to every code beneath it. Billing I70.309 with anything listed here is a denial.
Excludes2 inherited from the categories above I70.309
Also inherited, and the opposite of Excludes1: these conditions are not part of I70.309, but a patient can have both, so you may code both.
Written on I70 — Atherosclerosis
Other codes that can never be billed with I70.309
These codes carry an Excludes1 note pointing at I70.309. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I70.309 alone.
- I77.6Arteritis, unspecified
Risk adjustment
I70.309 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
I70.309 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56680Billing and Coding: Routine Foot Care
How I70.309 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 I70.309.
- Arteriosclerosis, arteriosclerotic›extremities›bypass graft
- Arteriosclerosis, arteriosclerotic›extremities›bypass graft›leg
Code history
I70.309 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 I70.30. If I70.309 is not quite right, the correct code is usually one of these.
- I70.301Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, right leg
- I70.302Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, left leg
- I70.303Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, bilateral legs
- I70.308Unspecified atherosclerosis of unspecified type of bypass graft(s) of the extremities, other extremity
Questions about I70.309
- Is I70.309 a billable ICD-10-CM code?
- Yes. I70.309 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I70.309 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 I70.309?
- I70.309 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 I70.309 (I70.3) and apply to it just the same.