Some doctors may be recommending unnecessary tests to their better insured patients.
The study looked at insurance claims from more than a million people.
Just under 8% got services that don't provide much value to the patient.
Those include hormone tests for thyroid problems, X-rays or MRI's for lower back pain, and brain scans for headaches.
There are many reasons why doctors run the tests.
Sometimes patients request them and treatment recommendations can change.
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