Question 1

What is ICD-10 code I63?

Accepted Answer

I63 is the ICD-10-CM diagnosis code for cerebral infarction. I63 sits in the ICD-10-CM chapter for diseases of the circulatory system (i00-i99), within the section covering cerebrovascular diseases (i60-i69).

I63 is a non-billable category for cerebral infarction. Move through the official child-code path until the documented detail supports a reportable code.

Question 2

Is I63 an HCC code?

Accepted Answer

I63 is a non-billable header code, so it cannot itself be a payment HCC. Header codes organize more specific child codes that share the same root concept; one of those children may map to a payment HCC under the CMS-HCC V28 or V24 risk adjustment model. Coders should select a child code from the I63 hierarchy that matches the documented presentation, then check that specific child for HCC status.

Question 3

Is I63 billable?

Accepted Answer

No. I63 is a header (non-billable) ICD-10-CM code. Header codes sit at a higher level of the diagnosis hierarchy and exist to organize a family of more specific child codes. Per ICD-10-CM coding guidelines, a header code cannot be reported on a claim as the diagnosis, coders must select a billable child code from the I63 hierarchy that matches the highest level of specificity supported by the provider's documentation. Payers reject header codes submitted as the primary diagnosis.

Question 4

Which HCC does I63 map to under V28?

Accepted Answer

I63 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

Question 5

What does I63 pay in RAF?

Accepted Answer

I63 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

Question 6

What documentation supports I63?

Accepted Answer

I63 is a non-billable category for cerebral infarction. Move through the official child-code path until the documented detail supports a reportable code. For this DOS, capture the provider's current assessment and the care action documented for cerebral infarction. Keep the checklist tied to the note. Do not swap I63 with I63.6. The FY2026 tabular describes I63.6 as cerebral infarction due to cerebral venous thrombosis, nonpyogenic. Follow the documented detail. I63 is not a CMS-HCC payment code, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

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I63

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Includes

Excludes 1, Do NOT code together

Excludes 2, Not included here, may code separately

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I63 ICD-10-CM Code: Cerebral infarction