I63.232 Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applies from I63 Cerebral infarction

Includes

• occlusion and stenosis of cerebral and precerebral arteries, resulting in cerebral infarction

Excludes1 (never code together)

• neonatal cerebral infarction (P91.82-)

Excludes2 (not included here)

• chronic, without residual deficits (sequelae) (Z86.73)
• sequelae of cerebral infarction (I69.3-)

Use additional code

• code, if applicable, to identify status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility (Z92.82)
• code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 249 — Ischemic or Unspecified Stroke
• CMS-HCC V22: HCC 100 — Ischemic or Unspecified Stroke
• ESRD V24: HCC 100

MS-DRG index

Defines the logic of DRG(s) 023-024 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 433.11 Occlusion and stenosis of carotid artery with cerebral infarction (approximate)

Code annotations containing back-references to I63.232

Back-references to I63.2

• Type 1 Excludes: I65 Occlusion and stenosis of precerebral arteries, not resulting in cerebral infarction ("insufficiency of precerebral arteries causing cerebral infarction (I63.0-I63.2)")
• Type 1 Excludes: I67 Other cerebrovascular diseases ("Occlusion and stenosis of precerebral artery causing cerebral infarction (I63.2-)")
• Type 2 Excludes: I74 Arterial embolism and thrombosis ("basilar embolism and thrombosis (I63.0-I63.2, I65.1)")
• Type 2 Excludes: I74 Arterial embolism and thrombosis ("carotid embolism and thrombosis (I63.0-I63.2, I65.2)")
• Type 2 Excludes: I74 Arterial embolism and thrombosis ("precerebral embolism and thrombosis NOS (I63.0-I63.2, I65.9)")
• Type 2 Excludes: I74 Arterial embolism and thrombosis ("vertebral embolism and thrombosis (I63.0-I63.2, I65.0)")

Back-references to I63

• Code Also: D57.03 Hb-SS disease with cerebral vascular involvement (", if applicable, cerebral infarction (I63.-)")
• Code Also: D57.213 Sickle-cell/Hb-C disease with cerebral vascular involvement (", if applicable, cerebral infarction (I63.-)")
• Code Also: D57.413 Sickle-cell thalassemia, unspecified, with cerebral vascular involvement (", if applicable cerebral infarction (I63.-)")
• Code Also: D57.433 Sickle-cell thalassemia beta zero with cerebral vascular involvement (", if applicable cerebral infarction (I63.-)")
• Code Also: D57.453 Sickle-cell thalassemia beta plus with cerebral vascular involvement (", if applicable cerebral infarction (I63.-)")
• Code Also: D57.813 Other sickle-cell disorders with cerebral vascular involvement (", if applicable: cerebral infarction (I63.-)")
• Code Also: D81.32 Adenosine deaminase 2 deficiency ("stroke (I63.-)")
• Type 1 Excludes: G31.84 Mild cognitive impairment of uncertain or unknown etiology ("cerebrovascular diseases (I60-I69)")
• Code Also: G43.6 Persistent migraine aura with cerebral infarction ("the type of cerebral infarction (I63.-)")
• Code First: G46 Vascular syndromes of brain in cerebrovascular diseases ("underlying cerebrovascular disease (I60-I69)")
• Code Also: G96.81 Intracranial hypotension ("Stroke (I63.-)")
• 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)")
• Use Additional: I16.1 Hypertensive emergency ("cerebral infarction (I63.-)")
• Code Also: I67.850 Cerebral autosomal dominant arteriopathy with subcortical infarcts and leukoencephalopathy ("stroke (I63.-)")
• Type 1 Excludes: P91.82 Neonatal cerebral infarction ("cerebral infarction (I63.-)")
• Code First: R29.7 National Institutes of Health Stroke Scale (NIHSS) score ("the type of cerebral infarction (I63.-)")
• Code First: Z92.82 Status post administration of tPA (rtPA) in a different facility within the last 24 hours prior to admission to current facility ("acute cerebral infarction (I63.-)")

Nearby codes

• I63.213 Cerebral infarction due to unspecified occlusion or stenosis of bilateral vertebral arteries
• I63.219 Cerebral infarction due to unspecified occlusion or stenosis of unspecified vertebral artery
• I63.22 Cerebral infarction due to unspecified occlusion or stenosis of basilar artery
• I63.23 Cerebral infarction due to unspecified occlusion or stenosis of carotid arteries
• I63.231 Cerebral infarction due to unspecified occlusion or stenosis of right carotid arteries
• I63.232 Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries (this code)
• I63.233 Cerebral infarction due to unspecified occlusion or stenosis of bilateral carotid arteries
• I63.239 Cerebral infarction due to unspecified occlusion or stenosis of unspecified carotid artery
• I63.29 Cerebral infarction due to unspecified occlusion or stenosis of other precerebral arteries
• I63.3 Cerebral infarction due to thrombosis of cerebral arteries
• I63.30 Cerebral infarction due to thrombosis of unspecified cerebral artery