Is I63.539 a billable ICD-10-CM code?

Yes. I63.539 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does I63.539 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 I63.539?

I63.539 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 I63.539 (I63) and apply to it just the same.

I63.539

I63.539 — Cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery

Billable / specific codeICD-10-CM

I63.539 is a billable, specific ICD-10-CM code for cerebral infarction due to unspecified occlusion or stenosis of unspecified posterior cerebral artery. It is valid for submission on a claim.

Excludes1 inherited from the categories above I63.539

These are not written on I63.539, but they bind it: a note on a category applies to every code beneath it. Billing I63.539 with anything listed here is a denial.

Written on I63 — Cerebral infarction

neonatal cerebral infarction (P91.82-)

Excludes2 inherited from the categories above I63.539

Also inherited, and the opposite of Excludes1: these conditions are not part of I63.539, but a patient can have both, so you may code both.

Written on I63 — Cerebral infarction

chronic, without residual deficits (sequelae) (Z86.73)
sequelae of cerebral infarction (I69.3-)

Other codes that can never be billed with I63.539

These codes carry an Excludes1 note pointing at I63.539. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading I63.539 alone.

P91.82Neonatal cerebral infarction

Risk adjustment

I63.539 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:

HCC 249 Ischemic or Unspecified Stroke0.239 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

I63.539 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.

A52868Billing and Coding: Transesophageal Echocardiography (TEE)
A56722Billing and Coding: Intraoperative Neurophysiological Testing
A56747Billing and Coding: Magnetic Resonance Angiography (MRA)
A56781Billing and Coding: Transthoracic Echocardiography (TTE)

Code history

I63.539 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 I63.53. If I63.539 is not quite right, the correct code is usually one of these.

Questions about I63.539

Is I63.539 a billable ICD-10-CM code?: Yes. I63.539 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does I63.539 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 I63.539?: I63.539 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 I63.539 (I63) and apply to it just the same.