I63.232
BillableCerebral infarction due to unspecified occlusion or stenosis of left carotid arteries
HCC Category Mapping
V28HCC 249 — Ischemic or Unspecified Stroke
0.289V24HCC 100 — Ischemic or Unspecified Stroke
0.262ESRDHCC 100 — Ischemic or Unspecified Stroke
0.000What This Code Means
A stroke caused by a blockage or narrowing of the left carotid artery in the neck, a major vessel supplying the brain.
Coding Tips
- •Confirm left carotid artery is specifically documented as the site of occlusion or stenosis
- •Review neuroimaging to support the diagnosis and laterality
Clinical Significance
Cerebral infarction due to unspecified occlusion or stenosis of the left carotid artery captures anterior circulation ischemic strokes with confirmed left carotid involvement but unknown mechanism. Left carotid territory strokes are particularly impactful because the left hemisphere controls language in most individuals, commonly causing aphasia. Accurate laterality coding supports clinical documentation quality and risk adjustment.
Documentation Requirements
- ✓Imaging confirmation of acute cerebral infarction in left carotid territory
- ✓Vascular imaging confirming left carotid artery occlusion or stenosis
- ✓Documentation specifying left-sided laterality
- ✓Neurological examination including speech and language assessment
- ✓Stroke mechanism evaluation to determine if thrombosis or embolism can be specified
- ✓Treatment plan including potential carotid intervention
Commonly Confused Codes
I63.032 — Thrombosis of left carotid artery; mechanism specified as thrombosisI63.132 — Embolism of left carotid artery; mechanism specified as embolismI63.231 — Unspecified occlusion of right carotid artery; opposite lateralityI63.239 — Unspecified occlusion of unspecified carotid artery; laterality unknownI65.22 — Occlusion of left carotid without cerebral infarction; no stroke
Code Hierarchy
└I63Cerebral infarction└I63.2Cerebral infarction due to unspecified occlusion or stenosis of precerebral arteries└I63.23Cerebral infarction due to unspecified occlusion or stenosis of carotid arteries└I63.232Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries
└I63.232Cerebral infarction due to unspecified occlusion or stenosis of left carotid arteries