Under section 262(f)(1) of the Public Health Service Act (42 U.S.C. 239a(f)(1)), the Secretary may, at any time, review on his own motion or on application, any determination made under this part (including, but not limited to, determinations concerning eligibility, entitlement to benefits, and the calculation and payment of benefits under the Program). Upon review of such a determination, the Secretary may affirm, vacate, or modify the determination in any manner the Secretary deems appropriate.