Medical necessity must be determined before treatment of services are provided to a Medicare patient. Which statement is true about the Medicare guidelines for determining medical necessity?

A. If the diagnosis is warranted, services or treatment would never be denied for medical necessity reason.

B. The policies and guidelines are public information.

C. The provider is allowed to order extensive test or procedures to determine a diagnosis.

D. The payer will decide the level of care that will be reimbursed.