A prepaid plan serving Medicare beneficiaries based on reimbursement, not risk. The Health Care Financing Administration (HCFA) will provide reimbursement for services actually provided. Distinguished from HMOs and similar plans in that HCPPs do not need to provide all Medicare covered services, do not have to offer open enrollment, and can avoid member appeal rights. HCPPs are frequently used by labor organizations to provide services for their members only.