Ntrm subarach hemorrhage from unsp middle cerebral artery

This code signifies bleeding into the subarachnoid space, specifically originating from the middle cerebral artery, without a traumatic cause. It indicates a spontaneous rupture of a vessel within this arterial distribution, leading to hemorrhage around the brain.

Apply this code when documentation confirms a spontaneous subarachnoid hemorrhage and the middle cerebral artery is identified as the source, but the specific segment or branch is not further specified. This is appropriate when imaging (e.g., CT angiography) or surgical findings localize the bleed to the MCA territory without more granular detail.

• Ensure documentation explicitly states "nontraumatic" or "spontaneous" to differentiate from traumatic subarachnoid hemorrhage.
• Do not use if a specific segment of the middle cerebral artery (e.g., M1, M2) is identified as the source; more specific codes exist.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter.