ICD-10-CM 2027
ICD-10 code for circle of Willis rupture
Nontraumatic subarachnoid hemorrhage from other intracranial arteries
From the official ICD-10-CM alphabetic index entry “Rupture, ruptured › circle of Willis”. Page updated September 29, 2026.
About coding circle of Willis rupture
The ICD-10-CM code for circle of Willis rupture is I60.6 (Nontraumatic subarachnoid hemorrhage from other intracranial arteries).
Within I60, choose I60.6 (from other intracranial arteries) only when documentation doesn't support a more specific option: from carotid siphon and bifurcation (I60.0), from middle cerebral artery (I60.1), from anterior communicating artery (I60.2), from posterior communicating artery (I60.3), from basilar artery (I60.4), from vertebral artery (I60.5), from unspecified intracranial artery (I60.7), other nontraumatic subarachnoid hemorrhage (I60.8) and 1 more.
Use an additional code, if known, to indicate National Institutes of Health Stroke Scale (NIHSS) score (R29.7-).
As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.
Common questions about circle of Willis rupture ICD-10 codes
What is the ICD-10 code for circle of Willis rupture?
- I60.6 — Nontraumatic subarachnoid hemorrhage from other intracranial arteries.
Is I60.6 billable?
- Yes. I60.6 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can I60.6 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict I60.6 as a principal diagnosis.
Is I60.6 a CC or MCC?
- I60.6 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.