; (C) comprehensiveness of items and services; (D) continuity of items and services; (E) patient waiting times, access to items and services, and references; and (F) performance standards, including organization, facilities, structure of items and services, efficiency of operation, and outcome in palliation, improvement of health, stabilization, cure, or rehabilitation. (3) Transition in application If the Secretary provides for additional requirements for providers under this subsection, any such additional requirement shall be implemented in a manner that provides for a reasonable period during which a previously qualified provider is permitted to meet such an additional requirement. 303. Use of private contracts (a) In general This section shall apply beginning on the date on which benefits are first available under section 106(a). Subject to the provisions of this section, nothing in this Act shall prohibit an institutional or individual provider from entering into a private contract with an individual enrolled for benefits under the Medicare for All Program for any item or service— (1) for which no claim for payment is to be submitted under this Act; and (2) for which the provider receives— (A) no reimbursement under this Act directly or on a capitated basis; and (B) receives no amount from an organization which receives reimbursement for such item or service under this Act directly or on a capitated basis. (b) Contract requirements (1) In general Any contract to provide an item or service under subsection (a) shall— (A) be in writing and signed by the individual (or authorized representative of the individual) receiving the item or service before the item or service is furnished pursuant to the contract; (B) be entered into at a time when the individual is facing an emergency health care situation