There’s a problem outside of the insurance issue. Diagnostic testing requires an order/script from a health care practitioner like the pt’s PCP or specialist. A pt can’t walk into a diagnostic testing facility and say, “I need an MRI of my back.” The folks performing the test cannot legally perform it without that order/script, much in the same way a pharmacist cannot dispense prescription medication without a prescription. That’s outside of dealing with insurance not covering the testing without an order/script. The tech can’t legally perform it without one either.