This appeal concerns one in a long series of challenges to the methodology chosen by the State of New York, with the approval of the Secretary of the United States Department of Health and Human Services, for computing Medicaid reimbursement under the Medicaid Act, 42 U.S.C. Â§Â§ 1396 et seq. (1976). This particular challenge was brought by the New York City Health and Hospitals Corporation (HHC), a public benefit corporation that operates many health care facilities, including municipal hospitals, and alleges a conflict between the State's 1980 Plan for Medical Assistance, N.Y.Admin.Code tit. 10, Â§ 86 (approved Jan. 1, 1980) on the one hand, and the Medicaid Act and the Professional Standards Review Organizations (PSRO) Act, 42 U.S.C. Â§Â§ 1320c et seq., on the other hand. It comes to us as an interlocutory appeal pursuant to 28 U.S.C. Â§ 1292(b) of an order of the United States District Court for the Southern District of New York, Charles L. Brieant, Jr., J., denying a motion by HHC for summary judgment on the first of five counts in HHC's complaint against three state officials and the Secretary. We also have before us a motion by appellees to dismiss the appeal on the ground that it is moot and that Â§ 1292(b) certification was improvidently granted. Because we agree that this case is not properly in this court, we grant the motion to dismiss and remand the case to the district court for further proceedings. I.