I63.81

Billable
ChapterI00–I99
Ranksubcategory
Official Description

Other cerebral infarction due to occlusion or stenosis of small artery

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

Instructional Notes

Includes
  • Lacunar infarction
General instructions are available for the parent sections:
View CH9 NotesView I60-I69 NotesView I63 Notes

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)
I60-I69Cerebrovascular diseases (I60-I69)
I63Cerebral infarction
I63.8Other cerebral infarction
I63.81Other cerebral infarction due to occlusion or stenosis of small artery

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I63.81:

categoryI63
Cerebral infarction
View context instructions
blockI60-I69
Cerebrovascular diseases (I60-I69)
View context instructions
chapterCH9
Diseases of the circulatory system (I00-I99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to I63.81. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

3 raw paths
Infarct, infarction3 unique routes
cerebral (acute)(2 variants)
due to(2 variants)
occlusion NEC
small artery→I63.81
stenosis NEC
small artery→I63.81
lacunar→I63.81

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 023
Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis with MCC or Antineoplastic Implant or Epilepsy with Neurostimulator
DRG 024
Craniotomy with Major Device Implant or Acute Complex CNS Principal Diagnosis without MCC
DRG 061
Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with MCC
DRG 062
Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent with CC
DRG 063
Ischemic Stroke, Precerebral Occlusion or Transient Ischemia with Thrombolytic Agent without CC/MCC
DRG 064
Intracranial Hemorrhage or Cerebral Infarction with MCC
DRG 065
Intracranial Hemorrhage or Cerebral Infarction with CC or tPA in 24 Hours
DRG 066
Intracranial Hemorrhage or Cerebral Infarction without CC/MCC
DRG 791
Prematurity with Major Problems
DRG 793
Full Term Neonate with Major Problems

Cross Reference

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