In 2007, an estimated 750,000 Americans traveled abroad for medical care. As depicted in Figures 2 and 3, this number is estimated to increase to six million by 2010.
The impact of dramatically rising U.S. health care costs is felt in every household and by every company. Even consumers with employer sponsored health insurance are increasingly considering outbound medical tourism as a viable care option: As their plan deductibles increase, many of the services available in outbound settings may be purchased under the deductible limit, thus conserving their Health Savings Account (HSA) balance.
Medical care in countries such as India, Thailand and Singapore can cost as little as 10 percent of the cost of comparable care in the United States. The price is remarkably lower for a variety of services, and often includes airfare and a stay in a resort hotel. Thanks, in part, to these low-cost care alternatives which almost resemble a mini-vacation, interest in medical tourism is strong and positive.
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In 2008, more than 400,000 [median estimate] non-U.S. residents will seek care in the United States and spend almost $5 billion for health services.
http://www.deloitte.com/dtt/cda/doc/content/us_chs_MedicalTourismStudy(1).pdf