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Think the system for paying US doctors is rigged to favor surgeons? Study may surprise you

ANN ARBOR, Mich. A surprising new study pulls back the curtain on one of the most contentious issues in health care: differences in payment and income between physicians who perform operations, procedures or tests, and those who don't.

Contrary to perception, the research indicates, the physician payment system is not inherently "rigged" to favor surgeons and other procedure-performing doctors.

The new findings counter the widely held belief that a simple difference in pay per minute explains why doctors who perform procedures often earn nearly twice as much money in a year as those who provide care mostly in office visits.

Instead, it appears the difference has more to do with how long it takes doctors to provide whatever care they give or rather, how long the influential Medicare payment system assumes it takes them. The results, compiled by a team based at the University of Michigan Medical School, are published in the Annals of Surgery.

Some have thought that because the panel that makes payment recommendations to the Medicare system includes mostly members of medical specialty societies, they allocate more dollars to the standard payments for their services.

But the team's exhaustive analysis of the Medicare Physician Fee Schedule finds that the rate surgeons are paid per minute while they perform surgery or a procedure is about the same as what primary care doctors or other "cognitive" physicians are paid per minute during a routine office visit.

Medicare's payment system includes codes for more than 6,000 types of physician work and the estimated times it takes doctors to perform each one. It has wider implications because it also influences the amounts private insurers pay.

The new analysis shows that the difference in pay between physicians arises mostly because of differences in the number of minutes that Medicare's formula assumes it takes doctors to do any particular operation, procedure or exam. The system is based on measurements called RVUs, for Relative Value Units. These RVUs are later directly converted to dollar amounts by Medicare using a separate formula.

Lead author Kevin Kerber, M.D., M.S., was surprised that nearly all of the differences in RVUs among the codes was explained by differences in the time estimates for the work. "This is a huge issue," says Kerber, "because we really need to understand our payment system before we can make effective changes that achieve desired outcomes." He is an associate professor in the U-M Department of Neurology and member of the U-M Institute for Healthcare Policy and Innovation.

"It is amazing to me how many people, including doctors, actually have no idea how payments per service are determined," he adds. "It is also amazing how many incorrect or ill-informed assumptions are out there about this issue. This is despite the fact that we are dealing with enormous amounts of money and that payment decisions can basically determine practice patterns. Doctors are human and thus susceptible to incentives."

The analysis did show that there are some outlier codes that paid substantially more or less per minute than average. But all are for types of services that aren't common, and therefore cannot explain large differences in income. On average, surgeons and procedure-performing doctors earn about $300,000 per year, compared with about $160,000 for primary care physicians.

"Our main interest in performing this work was not to identify outliers, but more simply to assess if the large differences in pay among specialties could be explained by differences in payment per time per service," Kerber says. "If that was true, then we would have had to assume that the groups who assign payments are giving more value to procedures and tests than to office visits. But, we did not find evidence to support that possibility, even after adjusting the analysis for the utilization of codes. What this means is that basically those who set RVU values for types of physician work are doing little more than assigning a standard RVU per minute amount to each and every service regardless of the type or specialty of the work."

The RVU values for each code are set by the federal Centers for Medicare and Medicaid Services, which takes input from the American Medical Association's Relative Value Scale Update Committee or RUC, which is made up of physicians from a wide range of specialties.

Kerber explains, "What this research shows is that the largest and most influential payer in healthcare Medicare and the panel of doctors that advises them the RUC are not overtly setting payment rates higher for surgeons and proceduralists than primary doctors." Yet, that still does not explain why proceduralists and surgeons earn much more money than primary doctors.

Kerber says that it remains possible that the times assigned to the codes may not be completely accurate. The time estimates are determined by surveys of physicians, which are subject to error.

If the times allocated to the RVUs are too short for office visits and too long for many surgeries and procedures, that would create actual differences in pay per minute, which would be much harder to identify. Another potential source for income difference could be in the additional payments that Medicare makes for the overhead costs involved in each service, such as tools and equipment. It is possible that these payments unintentionally create profit sources and incentives for procedures.

Other possibilities that could explain income differences are work hours or alternative income sources. The average proceduralist or surgeon works 5 percent to 10 percent more hours per week than the average primary care doctor. But the work hour difference doesn't even come close to explaining the magnitude of the differences in income. Proceduralists and surgeons could also have more non-patient care related income, such as income from administrative work or consulting.

Kerber notes that another reason that understanding physician payments is important is that medical students seriously consider future income in their career decision. "Some students will choose a high-income surgical specialty over primary or cognitive care, even if their passion is really with office-based work," he says. "That is a problem because our payment system is largely dis-incentivizing some of the most important careers in medicine."


Contact: Kara Gavin
University of Michigan Health System

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