I65.8 Occlusion and stenosis of other precerebral arteries

Billable ICD-10-CM code, FY2026.

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

Includes

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

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 061-063 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 433.80 Occlusion and stenosis of other specified precerebral artery without mention of cerebral infarction (approximate)

Code annotations containing back-references to I65.8

Back-references to I65

• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("cerebrovascular diseases (I60-I69)")
• Code First: G46 Vascular syndromes of brain in cerebrovascular diseases ("underlying cerebrovascular disease (I60-I69)")
• Type 2 Excludes: I10 Essential (primary) hypertension ("essential (primary) hypertension involving vessels of brain (I60-I69)")
• Type 2 Excludes: I15 Secondary hypertension ("secondary hypertension involving vessels of brain (I60-I69)")

Diagnosis Index entries for I65.8

• Beck's syndrome (anterior spinal artery occlusion)
• Céstan-Raymond syndrome
• Embolism (multiple) (paradoxical) › artery › auditory, internal
• Embolism (multiple) (paradoxical) › artery › choroidal (anterior)
• Embolism (multiple) (paradoxical) › artery › communicating posterior
• Embolism (multiple) (paradoxical) › artery › hypophyseal
• Embolism (multiple) (paradoxical) › artery › pontine
• Narrowing › artery › auditory, internal
• Occlusion, occluded › artery › auditory, internal
• Occlusion, occluded › artery › precerebral › specified NEC
• Raymond (-Céstan) syndrome
• Syndrome › Beck's
• Syndrome › Céstan (-Raymond)
• Syndrome › Raymond (-Céstan)

Nearby codes

• I65.2 Occlusion and stenosis of carotid artery
• I65.21 Occlusion and stenosis of right carotid artery
• I65.22 Occlusion and stenosis of left carotid artery
• I65.23 Occlusion and stenosis of bilateral carotid arteries
• I65.29 Occlusion and stenosis of unspecified carotid artery
• I65.8 Occlusion and stenosis of other precerebral arteries (this code)
• I65.9 Occlusion and stenosis of unspecified precerebral artery