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ONE consequence of the high cost of medical care in the United States has been the rise of medical tourism. Every year, thousands of Americans undergo surgery in other countries because the allure of good care at half the price is too good to pass up.

Average total fees at well-regarded hospitals like Apollo and Wockhardt in India are 60 percent to 90 percent lower than those of the average American hospital, according to a 2007 study by the consulting group Mercer Health and Benefits (where Dr. Milstein is affiliated). Even compared with low-cost American hospitals, the offshore fees are 20 percent to 50 percent lower.

Most medical travelers seek cosmetic procedures like facelifts and liposuction, but an increasing number have high-risk operations like heart surgery and joint replacement in places like India, Singapore and Thailand.

Is this a good idea? The only way to know is to find out how foreign hospitals and surgeons compare with their American counterparts.

Which Americans consider this option? Typically, they are people who have either no health insurance or meager coverage. Though not poor enough to qualify for Medicaid, they cannot afford a good health plan. But lately, even some people with good coverage have been encouraged to take advantage of cost savings abroad.

A few pioneering American insurers like Blue Cross Blue Shield of South Carolina and self-insured employers like the Hannaford Brothers supermarket chain sent American doctors to evaluate foreign hospitals. Favorably impressed, they now offer payment for travel expenses and cash incentives as high as $10,000 for choosing offshore hospitals.

For very costly operations like open heart surgery or hip joint replacement, savings far exceed these payments. That is not to say that offshore surgery could substantially lower health care costs. Less than 2 percent of spending by American health insurers goes to the kind of non-urgent procedures that Americans seek overseas.

Other negatives are obvious: people having surgery done halfway around the world are far from their regular doctors as well as friends and family. Consider, also, what happens if an American abroad falls victim to negligent care. Arranging transfer to another hospital may be difficult — and malpractice suits typically face longer odds and smaller payments than in the United Sates. To mitigate these problems, some insurers and free-standing medical travel services offer coordination with American doctors, local concierge services and supplementary medical malpractice insurance.

There is reason to think the quality of care at some foreign hospitals may be comparable to quality in the United States. More than 200 offshore hospitals have been accredited by the Joint Commission International, an arm of the organization that accredits American hospitals. Many employ English-speaking surgeons who trained at Western medical schools and teaching hospitals.

So should offshore surgery be welcomed as a modest way to make American health care more affordable? We can’t know until we can directly compare the outcomes with those of American surgery. To begin, we must adopt a uniform way for American hospitals and surgeons to report on the frequency of short-term surgical complications.

Medicare could do this by requiring that all participating hospitals and surgeons count pre-surgical risk factors and post-surgical complications during hospitalization and for 30 days afterward, when most short-term problems become evident. The system used for many years by Veterans Affairs hospitals to reduce surgical complications is the best option for this, since it is available to all American doctors through the American College of Surgeons. So far, however, only a small minority of surgeons participate in this or any other valid national system of reporting surgical outcomes.

Patients and their surgeons also need comparable measurements of long-term success. Medicare should lead by adopting Sweden’s method of monitoring hip joint replacement outcomes. It tracks, for example, a patient’s ability to walk without pain six years after surgery.

Finally, Medicare should invite accredited offshore hospitals and their affiliated doctors to participate in all of its comparative performance reporting systems. Beyond informing Americans contemplating treatment abroad, such comparisons would allow us to learn if our care is the world’s best — and to accelerate our improvement efforts if it is not.