All ICD10 Codes

I65

Non-Billable
ChapterI00–I99
Rankcategory
Official Description

Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

Use a more specific code (3 billable, 2 non-billable)
I65.0Occlusion and stenosis of vertebral arteryhas subcodesI65.1Occlusion and stenosis of basilar arteryI65.2Occlusion and stenosis of carotid arteryhas subcodesI65.8Occlusion and stenosis of other precerebral arteriesI65.9Occlusion and stenosis of unspecified precerebral artery
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 9: Diseases of the Circulatory System (I00-I99).

CH9 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

I60-I69 Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • traumatic intracranial hemorrhage (S06.-)
Use Additional Code
  • code to identify presence of:
  • alcohol abuse and dependence (F10.-)
  • exposure to environmental tobacco smoke (Z77.22)
  • history of tobacco dependence (Z87.891)
  • hypertension (I10-I1A)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Instructional Notes

Includes
  • embolism of precerebral artery
  • narrowing of precerebral artery
  • obstruction (complete) (partial) of precerebral artery
  • thrombosis of precerebral artery
Excludes1(Not coded here. Use a different code.)
  • insufficiency, NOS, of precerebral artery (G45.-)
  • insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)

Clinical Hierarchy

BillableHas subcodes
CH9Diseases of the circulatory system (I00-I99)
I60-I69Cerebrovascular diseases (I60-I69)
I65Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarctionNot billable
I65.0Occlusion and stenosis of vertebral arterySubcodes
I65.1Occlusion and stenosis of basilar arteryBillable
I65.2Occlusion and stenosis of carotid arterySubcodes
I65.8Occlusion and stenosis of other precerebral arteriesBillable
I65.9Occlusion and stenosis of unspecified precerebral arteryBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to I65:

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

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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