Cerebral arteritis in other diseases classified elsewhere

This code signifies inflammation of the cerebral arteries that is a manifestation of another underlying systemic disease. It indicates vasculitis affecting the brain's blood vessels, which is secondary to a primary condition.

Use this code when documentation explicitly states cerebral arteritis and links it to an underlying systemic disease not specifically excluded. This diagnosis requires physician documentation of both the cerebral arteritis and the causative "other disease."

• Ensure the medical record clearly identifies the underlying disease causing the cerebral arteritis.
• Do not use this code if the underlying disease is one of the Excludes1 conditions (e.g., lupus, syphilis, tuberculosis, listeriosis); instead, code the specific cerebral arteritis associated with that condition.
• Always sequence the underlying systemic disease first, followed by this code, as it is a manifestation code.