I63.29

HCC Category Mapping

What This Code Means

A stroke caused by a blockage or narrowing of blood vessels in the neck or head (other than the carotid or vertebral arteries) that supply the brain. The specific artery causing the problem is not identified in the medical record.

Coding Tips

• •This code requires documentation of the cerebral infarction and the affected precerebral artery; if the specific artery is documented (carotid, vertebral, basilar), use a more specific code instead
• •Verify whether laterality (left/right side) is documented, as some precerebral artery codes require this specification; if unspecified, this code may be appropriate

Clinical Significance

Cerebral infarction due to unspecified occlusion or stenosis of other precerebral arteries captures ischemic strokes involving precerebral vessels not otherwise classified (other than vertebral, basilar, or carotid) where the mechanism is also unspecified. This includes uncommon arteries like the subclavian or innominate. While rare, accurate identification of the involved artery aids in targeted treatment and secondary prevention.

Documentation Requirements

• ✓Imaging confirmation of acute cerebral infarction
• ✓Vascular imaging identifying a precerebral artery other than vertebral, basilar, or carotid
• ✓Documentation that the artery does not fit into standard subcategories
• ✓Neurological examination and stroke scale documentation
• ✓Stroke mechanism evaluation
• ✓Treatment plan and secondary prevention strategy

Commonly Confused Codes