OLDWICK, N.J.–(BUSINESS WIRE)–A.M. Best has assigned a Long-Term Issue Credit Rating of “bbb+” to the forthcoming $1.5 billion senior unsecured notes of UnitedHealth Group Incorporated (UnitedHealth) (Minnetonka, MN) [NYSE:UNH]. The outlook assigned to the Credit Rating (rating) is stable. The existing ratings of UnitedHealth and its subsidiaries are unchanged. The notes will be issued in two tranches: $750 million senior unsecured notes, due January 2027 and $750 million senior unsecured not