I60.01 Nontraumatic subarachnoid hemorrhage from right carotid siphon and bifurcation

ICD-10-CM I60.01: Nontraumatic subarachnoid hemorrhage from right carotid siphon and bifurcation

ICD-10-CM code I60.01 designates a nontraumatic subarachnoid hemorrhage originating from the right carotid siphon and bifurcation. The code is billable and specific for use on claims. It maps to Intracranial Hemorrhage under the CMS-HCC V28 risk adjustment model. Providers must document the nontraumatic nature and the right carotid siphon and bifurcation origin. 2 5 6

Plain-language overview

Code I60.01 identifies a nontraumatic subarachnoid hemorrhage specifically located at the right carotid siphon and bifurcation. This represents a lateralized cerebrovascular emergency requiring emergent intervention. 5

What this code represents

The ICD-10-CM system defines I60.01 as the diagnosis code for a nontraumatic subarachnoid hemorrhage from the right carotid siphon and bifurcation. It is a billable and specific code valid for submission on claims. 2 5 6

Coding details

The ICD-10-CM code set does not list any inclusion terms for I60.01 during the referenced effective period. The code provides laterality by specifying the right carotid siphon and bifurcation as the origin of the hemorrhage. 5

Documentation considerations

To support the use of I60.01, the provider must document a nontraumatic subarachnoid hemorrhage specifically from the right carotid siphon and bifurcation. This precise documentation establishes the lateralized anatomical origin required for the code. 5

Coverage and utilization context

Under the CMS-HCC V28 risk adjustment model, I60.01 maps to Intracranial Hemorrhage, designated as HCC 248, with a community non-dual aged base RAF weight of 0.239. The code also maps to Intracranial Hemorrhage under the V24 model. 5

What the sources add

The National Library of Medicine code browser confirms the official I60.01 label and its billable status, while the HCC Buddy reference adds the operational context of its CMS-HCC V28 risk adjustment mapping and RAF weight. 2 5

The University of Michigan phecode listing places I60.01 within a broader category of nontraumatic subarachnoid hemorrhages, distinguishing it from unspecified, left, and middle cerebral artery origins. 1

Centers for Medicare and Medicaid Services billing and coding articles reference nontraumatic subarachnoid hemorrhage codes within local coverage determination guidance, indicating their use in payer administrative contexts. 3 4

Sources

1. Phecode 430 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-25.
2. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Botulinum Toxin Types A and B Policy (A57185) — cms.gov; accessed 2026-07-25.
4. Article - Billing and Coding: Aortography and Peripheral Angiography (A57056) — cms.gov; accessed 2026-07-25.
5. 2026 ICD-10-CM I60.01: Nontraumatic subarachnoid | HCC 248 — hccbuddy.com; accessed 2026-07-25.
6. I60.01 — Nontraumatic subarachnoid hemorrhage from right carotid siphon and bifurcation | ICD-10 Code · Eleplan — eleplan.com; accessed 2026-07-25.