DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction

  • Header · not billable

I65 is not billable. The category heads 11 billable codes in FY2027, grouped under 5 subdivisions.

Index → code

  • Céstan-Raymond syndrome → I65.8
  • Raymond (-Céstan) syndrome → I65.8
  • Beck's syndrome (anterior spinal artery occlusion) → I65.8

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I60-I69 Cerebrovascular diseases (I60-I69)
  3. I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction
Billable codes
11
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
20

Codes in I65

  1. I65.0
    Occlusion and stenosis of vertebral artery
    Header
  2. I65.01
    Occlusion and stenosis of right vertebral artery
    Billable
  3. I65.02
    Occlusion and stenosis of left vertebral artery
    Billable
  4. I65.03
    Occlusion and stenosis of bilateral vertebral arteries
    Billable
  5. I65.09
    Occlusion and stenosis of unspecified vertebral artery
    Billable
  6. I65.1
    Occlusion and stenosis of basilar artery
    Billable
  7. I65.2
    Occlusion and stenosis of carotid artery
    Header
  8. I65.21
    Occlusion and stenosis of right carotid artery
    Billable
  9. I65.22
    Occlusion and stenosis of left carotid artery
    Billable
  10. I65.23
    Occlusion and stenosis of bilateral carotid arteries
    Billable
  11. I65.29
    Occlusion and stenosis of unspecified carotid artery
    Billable
  12. I65.8
    Occlusion and stenosis of other precerebral arteries
    Billable
  13. I65.9
    Occlusion and stenosis of unspecified precerebral artery
    Billable
    Inclusion terms 1

    Inclusion terms

    • Occlusion and stenosis of precerebral artery NOS

Sources of each column.

Instructions

At I65

Includes

  • embolism of precerebral artery
  • narrowing of precerebral artery
  • obstruction (complete) (partial) of precerebral artery
  • thrombosis of precerebral artery

Excludes1

  • insufficiency, NOS, of precerebral artery (G45.-) G45
  • insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2) I63.0 I63.2

Notes that also apply

Block I60-I69 instructions (Excludes1 1, Use additional code 8): printed on the block page.

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Beck's syndrome (anterior spinal artery occlusion) → I65.8
  • Céstan-Raymond syndrome → I65.8
  • Raymond (-Céstan) syndrome → I65.8
  • Embolism (multiple) (paradoxical)basilar (artery) → I65.1
  • Arteriosclerosis, arteriosclerotic (diffuse) (obliterans) (of) (senile) (with calcification)carotid → I65.2-
  • SyndromeBeck's → I65.8
  • SyndromeCéstan (-Raymond) → I65.8
  • SyndromeRaymond (-Céstan) → I65.8
  • Occlusion, occludedarteryvertebral → I65.0-
  • Occlusion, occludedarterybasilar → I65.1
  • Occlusion, occludedarterycarotid → I65.2-
  • Embolism (multiple) (paradoxical)arteryauditory, internal → I65.8
  • Embolism (multiple) (paradoxical)arterychoroidal (anterior) → I65.8
  • Embolism (multiple) (paradoxical)arterycommunicating posterior → I65.8
  • Embolism (multiple) (paradoxical)arteryhypophyseal → I65.8
  • Embolism (multiple) (paradoxical)arterypontine → I65.8
  • Narrowingarteryauditory, internal → I65.8
  • Occlusion, occludedarteryauditory, internal → I65.8
  • Occlusion, occludedarteryprecerebral → I65.9
  • Occlusion, occludedarteryprecerebralspecified NEC → I65.8

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy