... Under Medicaid, providers generally cannot balance bill Medicaid beneficiaries if the providers have already billed and accepted payment from Medicaid. In contrast, under Medicare, a provider’s ability to balance bill depends on whether he is a “participating” provider. A participating provider cannot balance bill Medicare beneficiaries because they have accepted the beneficiary’s assignment of Medicare benefits and Medicare’s approved payment amounts as full payment for the Medicare-covered services. Meanwhile, nonparticipating providers, who accept Medicare but have not agreed to accept assignment (i.e., they do not accept Medicare’s approved amount for health care services as full payment), can generally balance bill a Medicare beneficiary, but the amount cannot exceed more than 15 percent of the Medicare-approved payment amount for nonparticipating physicians for the service. ...