All ICD10 Codes

I66.12

Billable
ChapterI00–I99
Ranksubcategory
Official Description

Occlusion and stenosis of left anterior cerebral 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).
General instructions are available for the parent sections:
View CH9 NotesView I60-I69 NotesView I66 Notes

Clinical Hierarchy

CH9Diseases of the circulatory system (I00-I99)
I60-I69Cerebrovascular diseases (I60-I69)
I66Occlusion and stenosis of cerebral arteries, not resulting in cerebral infarction
I66.1Occlusion and stenosis of anterior cerebral artery
I66.12Occlusion and stenosis of left anterior cerebral artery

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I66.12:

categoryI66
Occlusion and stenosis of cerebral arteries, not resulting in 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

MS-DRG Classification

2026 v43.1

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

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 067
Precerebral Occlusion without Infarction with MCC
DRG 068
Precerebral Occlusion without Infarction without MCC
DRG 791
Prematurity with Major Problems
DRG 793
Full Term Neonate with Major Problems

Cross Reference

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