Carcinoid heart syndrome

This code represents the cardiac manifestations of carcinoid syndrome, a paraneoplastic syndrome caused by the release of vasoactive substances (e.g., serotonin) from neuroendocrine tumors, typically carcinoids. It primarily affects the right side of the heart, leading to valvular thickening and stenosis or regurgitation, most commonly of the tricuspid and pulmonary valves.

Use this code when documentation explicitly states "carcinoid heart syndrome" or describes the characteristic cardiac involvement (e.g., right-sided valvular disease) in a patient with a known or suspected carcinoid tumor and carcinoid syndrome. Supporting documentation includes echocardiogram findings, cardiac catheterization reports, and physician notes detailing the cardiac complications.

• Always code the underlying carcinoid tumor first, as it is the etiology of the syndrome.
• Do not confuse this with other forms of valvular heart disease; the documentation must link the cardiac findings to carcinoid syndrome.
• Look for specific mention of "carcinoid heart disease" or "carcinoid valvulopathy" in the diagnostic statement.