NY -- Standard&Poor's CreditWire 11/23/98 -- Standard&Poor's today assigned its single-'A' rating to United HealthCare Corp.'s $650 million senior unsecured notes offered under Rule 144A. The notes are offered in two tranches, $400 million of 5.65% fixed rate notes due 1999 without registration rights, and $250 million of 6.6% fixed rate notes due 2003 with registration rights. This is in addition to the $200 million mixed Rule 415 shelf registration filed Jan. 20, 1998 and $1.05 billion mixed Rule 415 shelf registration filed Oct. 22, 1998. This proposed $650 million offering does not represent a draw-down of either of the previous shelf filings. Standard&Poor's expects United's debt-to-total capital ratio and fixed charge coverage to