NEW YORK (Standard&Poor's CreditWire) Oct. 4, 1999--Standard&Poor's today assigned its single-'A'-plus rating to North Carolina Medical Care Commission's $21.64 million health care facility revenue bonds series 1999, dated Oct. 1, 1999, issued on behalf of Grace Hospital. The bonds are expected to sell the week of Oct. 11, 1999. Standard&Poor's also affirmed its single-'A'-plus rating on North Carolina Medical Care Commission's $25.1 million hospital revenue bonds, also issued for Grace Hospital. The rating reflects: -- A sound balance sheet highlighted by excellent liquidity equaling 160% of pro forma debt, -- A leading market position that should improve with the recent signing of a joint venture with its main local competitor that includes income sharing,