I63.9 ICD-10-CM Code: Cerebral infarction, unspecified
I63.9 is the billable ICD-10-CM code for “Cerebral infarction, unspecified” in the FY 2027 U.S. code set, effective Oct 1, 2026.
Official description
I63.9Cerebral infarction, unspecified
ICD-10-CM diagnosis code · United States clinical modification
More specific than I63.9
View categoryI63.9 is an unspecified code, for when the note doesn’t say more. If it documents the type, cause, or site, one of these codes may fit better.
I63.0Cerebral infarction due to thrombosis of precerebral arteriesI63.1Cerebral infarction due to embolism of precerebral arteriesI63.3Cerebral infarction due to thrombosis of cerebral arteriesI63.4Cerebral infarction due to embolism of cerebral arteriesI63.6Cerebral infarction due to cerebral venous thrombosis, nonpyogenicI63.8Other cerebral infarctionCoding tips for I63.9
Acute ischemic stroke (stroke NOS) when the mechanism and vessel aren’t documented.
What to document
- Document the mechanism and vessel: thrombosis, embolism or occlusion of precerebral or cerebral arteries each have their own I63 codes.
- Add Z92.82 if tPA was given at another facility within 24 hours before admission, as the I63 note says.
Watch for
- A past stroke with lasting deficits is coded with I69.3- sequelae codes; without deficits, Z86.73. Neither is I63.
- A transient ischemic attack is G45.9, not I63.9.
Codes that look alike
I63.50Cerebral infarction due to unspecified occlusion or stenosis of unspecified cerebral arteryUnspecified occlusion or stenosis of an unspecified cerebral artery.I69.30Unspecified sequelae of cerebral infarctionZ86.73Personal history of transient ischemic attack (TIA), and cerebral infarction without residual deficitsHistory of stroke or TIA without residual deficits.G45.9Transient cerebral ischemic attack, unspecifiedWhere I63.9 sits
- 1
Chapter 9
Diseases of the circulatory system (I00-I99)
- 2
Section
Cerebrovascular diseases (I60-I69)
- 3
Category I63
Cerebral infarction
- 4
Code I63.9
Cerebral infarction, unspecified
Notes for this code
Inclusion terms
- Stroke NOS
Code first
No “code first” instruction is listed for I63.9.
Use additional code
No “use additional code” instruction is listed for I63.9.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for I63.9.
Excludes2
Conditions not included here that may be reported separately when present.
- transient cerebral ischemic attacks and related syndromes (G45.-)
Source and release
- Data release
- U.S. ICD-10-CM · FY 2027
- Effective date
- Oct 1, 2026
- Publisher
- Vero Scribe Inc.
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Frequently asked questions
What does ICD-10-CM code I63.9 mean?
I63.9 is the FY 2027 U.S. ICD-10-CM code for “Cerebral infarction, unspecified.”
Is I63.9 a billable or specific ICD-10-CM code?
Yes. In the FY 2027 reference data used on this page, I63.9 has no child codes and is presented as a billable/specific code. Always confirm the active code set and payer requirements before use.
Where is I63.9 located in ICD-10-CM?
I63.9 is listed in Chapter 9, Diseases of the circulatory system (I00-I99), within Cerebrovascular diseases (I60-I69) (I60–I69), under category I63, Cerebral infarction.
What coding notes are listed for I63.9?
Its listed inclusion terms are Stroke NOS. No code-first instruction is listed. No Excludes1 note is listed. Excludes2 notes: transient cerebral ischemic attacks and related syndromes (G45.-).