ICD-10 Code I60.02 – Nontraumatic subarachnoid hemorrhage from left carotid siphon and bifurcation (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I60.02 – Nontraumatic subarachnoid hemorrhage from left carotid siphon and bifurcation
What it is
This code identifies a nontraumatic bleed into the subarachnoid space that originates from the left carotid siphon and bifurcation. Use it when documentation specifies this exact arterial source and side.
Clinical signs
Patients often present with sudden severe headache, neck stiffness, nausea, photophobia, or altered consciousness. Clinical features vary; refer to documentation, imaging, and provider statements confirming the left carotid siphon and bifurcation source.
When to use this code
Use I60.02 when the record clearly states a spontaneous subarachnoid hemorrhage from the left carotid siphon and bifurcation. It is appropriate when imaging or specialist documentation identifies this location and no traumatic cause is documented. If the source is uncertain, check documentation before assigning this code.
Do not use for
Do not use this code for traumatic subarachnoid hemorrhage or hemorrhage from a different vessel or side. Do not apply it when the chart only says subarachnoid hemorrhage without the specific left carotid siphon and bifurcation source.
Coding tip
Verify both the nontraumatic nature and the exact left-sided arterial source before coding.