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A new study published in the JAMA Internal Medicine and reviewed by Reuters Health suggests that Physician Compare, a U.S. website created to help patients find high-quality doctors, is missing so much information on individual providers that it may not be helpful.

Quality reporting has been a work in progress for almost three decades since a landmark 1999 report from the Institute of Medicine, `To Err is Human,’ concluded that tens of thousands of patients deaths each year were the direct result of medical errors.

Physician Compare is the flagship effort by the U.S. Centers for Medicare and Medicaid Services. But while more than 1 million clinicians care for Medicare enrollees, only about 239,000, or 23 percent, had any quality information at all available on the Physician Compare website, researchers report in JAMA Internal Medicine.

And virtually none of the doctors had data tied to their individual job performance.

“To truly be able to inform patient decision-making, it is imperative that the data accessible to patients and their caregivers capture a large swath of clinicians,” said lead study author Jun Li of the University of Michigan in Ann Arbor.

In the current study, only about 21 percent of primary care providers reported some individual or group information related to outcomes from their practice. But almost all of this data was at the practice level, making it hard for patients to know who might be a better or worse choice among several physicians at one clinic.

And half of them provided details on no more than one or two quality outcomes.

Doctors who did share individual level outcomes tended to have very high quality scores, suggesting that physicians may only opt into the voluntary reporting system when they know the results will make them look good, the study authors note.

Clinicians also aren’t required to report data on outcomes for every patient, and they may choose only to submit information for cases that turned out well, researchers point out.

“Given its voluntary nature, it is not a surprise few doctors submit to this platform,” said Dr. Vineet Arora of the University of Chicago Medicine.