I70.503 — Unspecified atherosclerosis of nonautologous biological bypass graft(s) of the extremities, bilateral legs
I70.503 is a billable, specific ICD-10-CM code for unspecified atherosclerosis of nonautologous biological bypass graft(s) of the extremities, bilateral legs. It is valid for submission on a claim.
Excludes2 inherited from the categories above I70.503
Also inherited, and the opposite of Excludes1: these conditions are not part of I70.503, but a patient can have both, so you may code both.
Written on I70 — Atherosclerosis
Other codes that can never be billed with I70.503
These codes carry an Excludes1 note pointing at I70.503. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I70.503 alone.
- I77.6Arteritis, unspecified
Risk adjustment
I70.503 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
I70.503 is named in 12 Medicare coverage policies — 12 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52850Billing and Coding: Cardiac Catheterization and Coronary Angiography
- A56232Billing and Coding: Foot Care
- A56460Billing and Coding: Dialysis Access Maintenance
- A56476Billing and Coding: Cardiac Radionuclide Imaging
How I70.503 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 I70.503.
- Arteriosclerosis, arteriosclerotic›extremities›bypass graft›nonautologous biological graft›leg›bilateral
Code history
I70.503 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 I70.50. If I70.503 is not quite right, the correct code is usually one of these.
- I70.501Unspecified atherosclerosis of nonautologous biological bypass graft(s) of the extremities, right leg
- I70.502Unspecified atherosclerosis of nonautologous biological bypass graft(s) of the extremities, left leg
- I70.508Unspecified atherosclerosis of nonautologous biological bypass graft(s) of the extremities, other extremity
- I70.509Unspecified atherosclerosis of nonautologous biological bypass graft(s) of the extremities, unspecified extremity
Questions about I70.503
- Is I70.503 a billable ICD-10-CM code?
- Yes. I70.503 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does I70.503 sit in the tabular list?
- Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).