Aortitis in diseases classified elsewhere

This code signifies inflammation of the aorta that is a manifestation or complication of another underlying systemic disease. It indicates that the primary disease process is causing the aortic inflammation, rather than the aortitis being a standalone, idiopathic condition.

Assign this code when documentation clearly links aortitis to another specified disease, such as a connective tissue disorder (e.g., rheumatoid arthritis, lupus), vasculitis (e.g., Takayasu's arteritis, giant cell arteritis), or other systemic inflammatory conditions. The medical record should explicitly state the underlying disease causing the aortitis.

• Always sequence the underlying systemic disease first, followed by this code.
• Do not use this code for syphilitic aortitis; refer to the Excludes1 note.
• Ensure the physician's documentation clearly establishes the causal link between the systemic disease and the aortitis.