Health Insurance Exchange Plans: 1-844-282-3025. Medicare Advantage Plans: 1-844-282-3026. US Family Health Plan: 1-800-67-USFHP. For medical questions, you can reach a registered nurse any time, day or night: Health Insurance Exchange Plans: 1-844-581-3175. Medicare Advantage: 1-844-581-3174. US Family Health Plan: 1-800-455-9355..