Is I70.21 a billable ICD-10-CM code?

No. I70.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does I70.21 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).

I70.21

I70.21 — Atherosclerosis of native arteries of extremities with intermittent claudication

Non-billable headerICD-10-CM

I70.21 is a non-billable header ICD-10-CM code for atherosclerosis of native arteries of extremities with intermittent claudication. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes2 inherited from the categories above I70.21

Also inherited, and the opposite of Excludes1: these conditions are not part of I70.21, but a patient can have both, so you may code both.

Written on I70.2 — Atherosclerosis of native arteries of the extremities

atherosclerosis of bypass graft of extremities (I70.30-I70.79)

Written on I70 — Atherosclerosis

arteriosclerotic cardiovascular disease (I25.1-)
arteriosclerotic heart disease (I25.1-)
atheroembolism (I75.-)
cerebral atherosclerosis (I67.2)
coronary atherosclerosis (I25.1-)
mesenteric atherosclerosis (K55.1)
precerebral atherosclerosis (I67.2)
primary pulmonary atherosclerosis (I27.0)

Other codes that can never be billed with I70.21

These codes carry an Excludes1 note pointing at I70.21. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I70.21 alone.

I77.6Arteritis, unspecified

Risk adjustment

I70.21 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.

Code history

I70.21 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead I70.21

5 child codes. Green means billable.

Related codes at this level

Codes that share I70.2. If I70.21 is not quite right, the correct code is usually one of these.

Questions about I70.21

Is I70.21 a billable ICD-10-CM code?: No. I70.21 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does I70.21 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Diseases of arteries, arterioles and capillaries (I70-I79).