ICD-10-CM 2027
ICD-10 code for cerebral acute infarct
From the official ICD-10-CM alphabetic index entry “Infarct, infarction › cerebral (acute)”. Page updated September 29, 2026.
About coding cerebral acute infarct
The ICD-10-CM code for cerebral acute infarct is I63.9 (Cerebral infarction, unspecified). The official index lists 21 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on I63.9.
Within I63, choose I63.9 (unspecified) only when documentation doesn't support a more specific option: due to thrombosis of precerebral arteries (I63.0), due to embolism of precerebral arteries (I63.1), due to unspecified occlusion or stenosis of precerebral arteries (I63.2), due to thrombosis of cerebral arteries (I63.3), due to embolism of cerebral arteries (I63.4), due to unspecified occlusion or stenosis of cerebral arteries (I63.5), due to cerebral venous thrombosis, nonpyogenic (I63.6) and other cerebral infarction (I63.8).
The conditions in its Excludes2 note aren't part of I63.9, but may be coded alongside it if the patient has both: transient cerebral ischemic attacks and related syndromes (G45.-).
Use an 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 an additional code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-).
More specific cerebral acute infarct codes (official index)
- aborted I63.9 — Cerebral infarction, unspecified
- chronic (imaging) (old) (remote) (without sequelae) Z86.73 — Personal history of transient ischemic attack (TIA), and cerebral infarction without residual deficits
- with residual defects
- cortical I63.9 — Cerebral infarction, unspecified
- due to
- cerebral venous thrombosis, nonpyogenic I63.6 — Cerebral infarction due to cerebral venous thrombosis, nonpyogenic
- embolism
- cerebral arteries I63.4 — Cerebral infarction due to embolism of cerebral arteries
- precerebral arteries I63.1 — Cerebral infarction due to embolism of precerebral arteries
- occlusion NEC
- cerebral arteries I63.5 — Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries
- precerebral arteries I63.2 — Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries
- small artery I63.81 — Other cerebral infarction due to occlusion or stenosis of small artery
- stenosis NEC
- cerebral arteries I63.5 — Cerebral infarction due to unspecified occlusion or stenosis of cerebral arteries
- precerebral arteries I63.2 — Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries
- small artery I63.81 — Other cerebral infarction due to occlusion or stenosis of small artery
- thrombosis
- cerebral artery I63.3 — Cerebral infarction due to thrombosis of cerebral arteries
- precerebral artery I63.0 — Cerebral infarction due to thrombosis of precerebral arteries
- intraoperative
- during cardiac surgery I97.810 — Intraoperative cerebrovascular infarction during cardiac surgery
- during other surgery I97.811 — Intraoperative cerebrovascular infarction during other surgery
- neonatal P91.82 — Neonatal cerebral infarction
- perinatal (arterial ischemic) P91.82 — Neonatal cerebral infarction
- postprocedural
- following cardiac surgery I97.820 — Postprocedural cerebrovascular infarction following cardiac surgery
- following other surgery I97.821 — Postprocedural cerebrovascular infarction following other surgery
- specified NEC I63.89 — Other cerebral infarction
Common questions about cerebral acute infarct ICD-10 codes
What is the ICD-10 code for cerebral acute infarct?
- I63.9 — Cerebral infarction, unspecified. More specific codes apply when the documentation supports them: I63.9, Z86.73, I63.9, I63.6 and others below.
What is the ICD-10 code for aborted cerebral acute infarct?
- I63.9 — Cerebral infarction, unspecified.
What is the ICD-10 code for chronic cerebral acute infarct?
- Z86.73 — Personal history of transient ischemic attack (TIA), and cerebral infarction without residual deficits.
What is the ICD-10 code for cortical cerebral acute infarct?
- I63.9 — Cerebral infarction, unspecified.
What is the ICD-10 code for neonatal cerebral acute infarct?
- P91.82 — Neonatal cerebral infarction (header code; choose a more specific subcode).
What is the ICD-10 code for perinatal cerebral acute infarct?
- P91.82 — Neonatal cerebral infarction (header code; choose a more specific subcode).
Is I63.9 billable?
- Yes. I63.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I63.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I63.9 as a principal diagnosis.
Is I63.9 a CC or MCC?
- I63.9 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.