This document discusses medical tourism, which is defined as traveling from one country to another for medical treatment. It notes that estimates of the number of US patients traveling abroad for care vary widely, from 60,000-85,000 per year according to one study to over 750,000 according to another. Several factors are driving growth in medical tourism, including rapidly rising healthcare costs in the US, a decrease in the percentage of Americans with health insurance, and significantly lower costs for care abroad. If US health plans covered medical travel, one study estimated the number of outbound medical tourists could grow to 500,000-700,000 patients annually.