Is I65.09 a billable ICD-10-CM code?

Yes. I65.09 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I65.09 sit in the tabular list?

Diseases of the circulatory system (I00-I99), in the block Cerebrovascular diseases (I60-I69).

What cannot be coded together with I65.09?

I65.09 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 I65.09 (I65) and apply to it just the same.

I65.09

I65.09 — Occlusion and stenosis of unspecified vertebral artery

Billable / specific codeICD-10-CM

I65.09 is a billable, specific ICD-10-CM code for occlusion and stenosis of unspecified vertebral artery. It is valid for submission on a claim.

Excludes1 inherited from the categories above I65.09

These are not written on I65.09, but they bind it: a note on a category applies to every code beneath it. Billing I65.09 with anything listed here is a denial.

Written on I65 — Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

insufficiency, NOS, of precerebral artery (G45.-)
insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)

Risk adjustment

I65.09 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

I65.09 is named in 6 Medicare coverage policies — 6 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56551Billing and Coding: Visual Fields Testing
A56722Billing and Coding: Intraoperative Neurophysiological Testing
A57174Billing and Coding: MolDX: Pharmacogenomics Testing
A57361Billing and Coding: Monitored Anesthesia Care

Code history

I65.09 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 I65.0. If I65.09 is not quite right, the correct code is usually one of these.

Questions about I65.09

Is I65.09 a billable ICD-10-CM code?: Yes. I65.09 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I65.09 sit in the tabular list?: Diseases of the circulatory system (I00-I99), in the block Cerebrovascular diseases (I60-I69).
What cannot be coded together with I65.09?: I65.09 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 I65.09 (I65) and apply to it just the same.