Humana Inc. (HUM) will get 5 percent more in Medicare payments and a "five-star" rating for one of its health plans under a U.S. program that may be helping to improve care for the elderly, according to an analysis that quickly spurred Republican criticism. The program provides bonuses to health insurers who beef up Medicare Advantage plans by limiting how many members are re- admitted to the hospital after a discharge, increasing the amount of preventative care and getting acceptable ratings on patient satisfaction surveys, among other criteria. Insurers are rated from one star, the lowest, to five stars, the highest.