There are two types of Medicare providers. Participating providers (PAR) accept payment directly from Medicare. At the office you pay your deductible and the doctor waits for payment from Medicare. Non-participating providers (NON-PAR) collect the entire fee at the time of your visit and the patient waits for reimbursement from Medicare. NON-PAR fees are set by Medicare not by the provider. For more information, visit the Medicare.gov website.