NEW YORK – (Standard&Poor's CreditWire) Oct 8, 1999—Standard&Poor's today assigned its single-'A' rating to North Carolina Medical Care Commission's health care revenue bonds series 1999 dated July 20, issued on behalf of Stanly Health Services. The bonds are expected to sell on Oct. 19, 1999. The rating reflects: -- Dominant market position in Stanly County, -- Strong financial profile highlighted by sound liquidity and consistent profitability, and -- Established trend of utilization and revenue growth over the past several years. A higher rating is precluded by the hospital's dependence on top admitters for a large portion of its volumes, despite successful recruitment of a well-diversified complement of active physicians; and a vulnerable payor mix with increasing