Detroit Medical Center has repaid $2.7 million to Wayne State University's School of Medicine for past physician payments. The money was for contractual agreements to WSU's University Physician Group for care stipulated under a 2006 agreement between the two longtime partners. Since February, DMC has withheld $1 million a month in state Medicaid payments for doctors, saying that higher Medicaid reimbursement WSU doctors began receiving in October put physicians' salaries above so-called fair market value.