ICD-11 classes
11 Diseases of the circulatory system
Cerebrovascular diseases
Cerebral ischaemia
8B11 — Cerebral ischaemic stroke
8B11.5 — Cerebral ischaemic stroke of unknown cause

ICD-11 8B11.5 — Cerebral ischaemic stroke of unknown cause

This is a sudden loss of brain function due to a lack of adequate blood flow. It is of an uncertain nature, and approximately 30% of examined events fall into this category.

The diagnosis excludes nothing.

Diagnosis with code 8B11.5 contains 3 clarifying diagnoses:

1. 8B11.50 — Cerebral ischaemic stroke due to unspecified occlusion or stenosis of extracranial large artery
2. 8B11.51 — Cerebral ischaemic stroke due to unspecified occlusion or stenosis of intracranial large artery
3. 8B11.5Z — Cerebral ischaemic stroke, unspecified

The diagnosis is coded elsewhere:

• Cerebral ischaemic stroke #7020
• Cerebral ischaemic stroke of unknown cause #7036