I63.10

HCC Category Mapping

What This Code Means

A stroke caused by a blood clot blocking an artery in the neck or brain, but the specific artery is not identified.

Coding Tips

• •Use this code only when the specific precerebral artery cannot be determined; otherwise, assign a more specific code.
• •Ensure documentation specifies embolism as the cause before coding; if cause is unclear, consider I63.20 for unspecified occlusion/stenosis.

Clinical Significance

Cerebral infarction due to embolism of an unspecified precerebral artery represents an ischemic stroke caused by a clot that traveled from another location and lodged in a precerebral artery. Embolic strokes are often associated with cardiac sources such as atrial fibrillation. This code captures a common stroke mechanism and is significant for risk adjustment, though the unspecified artery reduces documentation specificity.

Documentation Requirements

• ✓Imaging confirmation of acute cerebral infarction
• ✓Documentation of embolism as the stroke mechanism
• ✓Documentation that the specific precerebral artery cannot be identified
• ✓Evaluation for embolic source (echocardiogram, cardiac rhythm monitoring)
• ✓Neurological examination and National Institutes of Health Stroke Scale
• ✓Treatment plan including anticoagulation considerations

Commonly Confused Codes