Imagine you’re a Medicare patient, and you go to your doctor for an ultrasound of your heart one month. Medicare pays your doctor’s office $189, and you pay about 20 percent of that bill as a co-payment.

Then, the next month, your doctor’s practice has been bought by the local hospital. You go to the same building and get the same test from the same doctor, but suddenly the price has shot up to $453, as has your share of the bill.

Patients around the country are getting that unpleasant surprise, as more and more doctors’ offices are being bought by hospitals. Medicare, the government health insurance program for those 65 and over or the disabled, pays one price to independent doctors and another to doctors who work for large health systems — even if they are performing the exact same service in the exact same place.

This week, the Obama administration recommended a change to eliminate much of that gap. Despite expected protests from hospitals and doctors, the idea has a chance of being adopted because it would yield huge savings for Medicare and patients.

In the dry language of the annual budget, the White House asks Congress to “encourage efficient care by improving incentives to provide care in the most appropriate ambulatory setting.” In normal English, that means reducing financial incentives that are causing many doctors to sell their practices to hospitals just to take advantage of extra revenue.

The heart doctors are a great example. In 2009, the federal government cut back on what it paid to cardiologists in private practice who offered certain tests to their patients. Medicare determined that the tests, which made up about 30 percent of a typical cardiologist’s revenue, cost more than was justified, and there was evidence that some doctors were overusing them. Suddenly, Medicare paid about a third less than it had before.

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Jeffrey R. Ungvary President