Ntrm subarach hemor from right carotid siphon and bifurc

This code signifies a spontaneous (nontraumatic) bleeding into the subarachnoid space originating specifically from the right carotid siphon and bifurcation. This type of hemorrhage is often caused by a ruptured aneurysm in this particular cerebral artery segment. It leads to acute neurological symptoms due to increased intracranial pressure and irritation of the brain and meninges.

Use this code when documentation clearly specifies a nontraumatic subarachnoid hemorrhage and precisely identifies the bleeding source as the right carotid siphon and bifurcation. This typically follows diagnostic imaging (e.g., CT angiography, cerebral angiography) confirming the location of the ruptured vessel. The physician's final diagnosis should explicitly state the nontraumatic nature and the specific anatomical origin.

• Ensure documentation differentiates between traumatic and nontraumatic subarachnoid hemorrhage.
• Verify the specific arterial source; do not use this code for unspecified carotid or other cerebral artery origins.
• Code any associated neurological deficits or complications (e.g., hydrocephalus, vasospasm) separately.