ICD-10-CM 2027
ICD-10 code for lacunar infarct
Other cerebral infarction due to occlusion or stenosis of small artery
From the official ICD-10-CM alphabetic index entry “Infarct, infarction › lacunar”. Page updated September 29, 2026.
About coding lacunar infarct
The ICD-10-CM code for lacunar infarct is I63.81 (Other cerebral infarction due to occlusion or stenosis of small artery).
Within I63.8 (other cerebral infarction), I63.81 is specifically for other cerebral infarction due to occlusion or stenosis of small artery. Related codes cover infarction (I63.89).
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-).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about lacunar infarct ICD-10 codes
What is the ICD-10 code for lacunar infarct?
- I63.81 — Other cerebral infarction due to occlusion or stenosis of small artery.
Is I63.81 billable?
- Yes. I63.81 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I63.81 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I63.81 as a principal diagnosis.
Is I63.81 a CC or MCC?
- I63.81 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.