ICD-10 Code I60.00 – Nontraumatic subarachnoid hemorrhage from unspecified carotid siphon and bifurcation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I60.00 – Nontraumatic subarachnoid hemorrhage from unspecified carotid siphon and bifurcation
What it is
This code identifies a spontaneous subarachnoid hemorrhage, meaning bleeding into the space around the brain, arising from an unspecified carotid siphon or bifurcation. Use it when the record supports the site but does not specify laterality or another more exact vessel detail.
Clinical signs
Patients commonly present with sudden severe headache, neck stiffness, nausea, vomiting, photophobia, or altered consciousness. Clinical features vary; refer to documentation, imaging, and provider assessment for the exact hemorrhage source.
When to use this code
Use I60.00 when the provider documents a nontraumatic subarachnoid hemorrhage linked to the carotid siphon or bifurcation, but the side is not specified. It also fits when imaging or operative notes identify this location without further detail. If the chart names a different artery or a traumatic cause, choose another code.
Do not use for
Do not use this code for traumatic subarachnoid hemorrhage or for hemorrhage from a different intracranial vessel. Check documentation if the source vessel, laterality, or cause is unclear.
Coding tip
Confirm that the record says nontraumatic and that the carotid siphon or bifurcation is the documented source before assigning I60.00.