ICD-10-CM
ICD-10 code for Stroke: I63.9
The ICD-10-CM index points "Stroke" to I63 (Cerebral infarction), a header that is not billable. When nothing more specific is documented, the billable code is I63.9, Cerebral infarction, unspecified.
Source: CDC ICD-10-CM FY2027 Alphabetic Index file dated June 16, 2026. Publisher page
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Index subterms
A header groups codes and is not billed. A billable code is one you can report.
- I63.9cerebrovascular (ischemic), Cerebral infarction, unspecifiedBillable
- I63.9cryptogenic, Cerebral infarction, unspecifiedBillable
- T67.01heat, Heatstroke and sunstrokeHeader
- I63.9in evolution, Cerebral infarction, unspecifiedBillable
- T67.01sun, Heatstroke and sunstrokeHeader
- I63.9unspecified (NOS), Cerebral infarction, unspecifiedBillable
More specific codes in I63
A header groups codes and is not billed. A billable code is one you can report.
- I63Cerebral infarctionHeader
- I63.0Cerebral infarction due to thrombosis of precerebral arteriesHeader
- I63.00Cerebral infarction due to thrombosis of unspecified precerebral arteryBillable
- I63.01Cerebral infarction due to thrombosis of vertebral arteryHeader
- I63.02Cerebral infarction due to thrombosis of basilar arteryBillable
- I63.03Cerebral infarction due to thrombosis of carotid arteryHeader
- I63.09Cerebral infarction due to thrombosis of other precerebral arteryBillable
- I63.1Cerebral infarction due to embolism of precerebral arteriesHeader
- I63.10Cerebral infarction due to embolism of unspecified precerebral arteryBillable
- I63.11Cerebral infarction due to embolism of vertebral arteryHeader
- I63.12Cerebral infarction due to embolism of basilar arteryBillable
- I63.13Cerebral infarction due to embolism of carotid arteryHeader
- I63.19Cerebral infarction due to embolism of other precerebral arteryBillable
- I63.2Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteriesHeader
- I63.20Cerebral infarction due to unspecified occlusion or stenosis of unspecified precerebral arteriesBillable
- I63.21Cerebral infarction due to unspecified occlusion or stenosis of vertebral arteriesHeader
- I63.22Cerebral infarction due to unspecified occlusion or stenosis of basilar arteryBillable
- I63.23Cerebral infarction due to unspecified occlusion or stenosis of carotid arteriesHeader
- I63.29Cerebral infarction due to unspecified occlusion or stenosis of other precerebral arteriesBillable
- I63.3Cerebral infarction due to thrombosis of cerebral arteriesHeader
- I63.30Cerebral infarction due to thrombosis of unspecified cerebral arteryBillable
- I63.31Cerebral infarction due to thrombosis of middle cerebral arteryHeader
- I63.32Cerebral infarction due to thrombosis of anterior cerebral arteryHeader
- I63.33Cerebral infarction due to thrombosis of posterior cerebral arteryHeader
- I63.34Cerebral infarction due to thrombosis of cerebellar arteryHeader
- I63.39Cerebral infarction due to thrombosis of other cerebral arteryBillable
- I63.4Cerebral infarction due to embolism of cerebral arteriesHeader
- I63.40Cerebral infarction due to embolism of unspecified cerebral arteryBillable
- I63.41Cerebral infarction due to embolism of middle cerebral arteryHeader
- I63.42Cerebral infarction due to embolism of anterior cerebral arteryHeader
- I63.43Cerebral infarction due to embolism of posterior cerebral arteryHeader
- I63.44Cerebral infarction due to embolism of cerebellar arteryHeader
- I63.49Cerebral infarction due to embolism of other cerebral arteryBillable
- I63.5Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteriesHeader
- I63.50Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebral arteryBillable
- I63.51Cerebral infarction due to unspecified occlusion or stenosis of middle cerebral arteryHeader
- I63.52Cerebral infarction due to unspecified occlusion or stenosis of anterior cerebral arteryHeader
- I63.53Cerebral infarction due to unspecified occlusion or stenosis of posterior cerebral arteryHeader
- I63.54Cerebral infarction due to unspecified occlusion or stenosis of cerebellar arteryHeader
- I63.59Cerebral infarction due to unspecified occlusion or stenosis of other cerebral arteryBillable
- I63.6Cerebral infarction due to cerebral venous thrombosis, nonpyogenicBillable
- I63.8Other cerebral infarctionHeader
- I63.81Other cerebral infarction due to occlusion or stenosis of small arteryBillable
- I63.89Other cerebral infarctionBillable
- I63.9Cerebral infarction, unspecifiedBillable
Use additional code
The CDC tabular list says to add the code named here after this one when it applies.
From I63. A note on a category applies to every code under it.
Use additional code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
Use additional code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)
Excludes1
Excludes1 means these codes are not reported together.
From I63. A note on a category applies to every code under it.
Excludes2
Excludes2 means the other condition can be reported with this one when both are documented.
From I63. A note on a category applies to every code under it.
Related pages
- I63.9 code detailsNotes, nearby codes, CMS-HCC group
- Category I63Every code under it
- Chapter 9Diseases of the circulatory system
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Stroke?
The ICD-10-CM index points "Stroke" to I63 (Cerebral infarction), a header that is not billable. When nothing more specific is documented, the billable code is I63.9, Cerebral infarction, unspecified.
Is I63.9 billable?
Yes. I63.9 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to I63.9?
The CDC tabular list gives 1 Excludes1 note (not coded together), 3 Excludes2 notes (may be coded together when both are documented), 2 "use additional code" notes for I63.9 and the categories above it. They are listed on this page.
What chapter is I63.9 in?
Chapter 9. Diseases of the circulatory system.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.