; (C) provide efficient and affordable care; (D) address geographic variation in the provision of health services; or (E) prevent or manage chronic illness; and (2) promotes care that is integrated, patient-centered, quality, and efficient. (c) Encouraging the use of high-Value services To the extent allowed by the benefit standards applied to all health benefits plans participating in the Exchanges (as described in section 2202(b)), the health plan may modify cost-sharing and payment rates to encourage the use of services that promote health and value. (d) Promotion of delivery system reform The Secretary shall monitor and evaluate the progress of payment and delivery system reforms under this section and shall seek to implement such reforms subject to the following: (1) To the extent that the Secretary finds a payment and delivery system reform successful in improving quality and reducing costs, the Secretary shall implement such reform on as large a geographic scale as practical and economical. (2) The Secretary may delay the implementation of such a reform in geographic areas in which such implementation would place the public health insurance option at a competitive disadvantage. (3) The Secretary may prioritize implementation of such a reform in high-cost geographic areas or otherwise in order to reduce total program costs or to promote high-value care. (e) Non-Uniformity permitted Nothing in this section shall prevent the Secretary from varying payments based on different payment structure models (such as accountable care organizations and medical homes) under the health plan for different geographic areas. (f) Integration with Social Services The Secretary shall establish processes and, when appropriate, collaborate with other agencies to integrate medical care under the health plan with food, housing, transportation, and income assistance if the Secretary determines that such integration is expected to— (1) reduce spending without reducing the quality of patient care