; (2) by adding at the end the following new subsection: (m) Authority To provide incentive payments to beneficiaries with respect to qualifying primary care services (1) Program (A) In general In order to encourage Medicare fee-for-service beneficiaries to obtain medically necessary primary care services, an ACO participating under this section under a payment model described in clause (i) or (ii) of paragraph (2)(B) may apply to establish an ACO Beneficiary Incentive Program to provide incentive payments to such beneficiaries who are furnished qualifying services in accordance with this subsection. The Secretary shall permit such an ACO to establish such a program at the Secretary’s discretion and subject to such requirements, including program integrity requirements, as the Secretary determines necessary. (B) Implementation The Secretary shall implement this subsection on a date determined appropriate by the Secretary. Such date shall be no earlier than January 1, 2019, and no later than January 1, 2020. (2) Conduct of program (A) Duration Subject to subparagraph (H), an ACO Beneficiary Incentive Program established under this subsection shall be conducted for such period (of not less than 1 year) as the Secretary may approve. (B) Scope An ACO Beneficiary Incentive Program established under this subsection shall provide incentive payments to all of the following Medicare fee-for-service beneficiaries who are furnished qualifying services by the ACO: (i) With respect to the Track 2 and Track 3 payment models described in section 425.600(a) of title 42, Code of Federal Regulations (or in any successor regulation), Medicare fee-for-service beneficiaries who are preliminarily prospectively or prospectively assigned (or otherwise assigned, as determined by the Secretary) to the ACO. (ii) With respect to any future payment models involving two-sided risk, Medicare fee-for-service beneficiaries who are assigned to the ACO, as determined by the Secretary. (C) Qualifying service For purposes of this subsection, a