President Barack Obama's proposed health care shake-up took no prisoners last week. The president's plan, which could boost competition among insurers, pushed the Dow Jones U.S. Health Care Providers index down 10% on Thursday, the worst industry decline that day. Humana ( HUM) lost 20% while UnitedHealth Group ( UNH) dropped 13% and Aetna ( AET) tumbled 11%. Obama's reform program targets Medicare Advantage plans, through which 11 million senior citizens receive medical and prescription drug benefits. Reimbursements to companies that administer these plans are 15% higher, on average, than those for comparable Medicare services. The new administration aims to save $175 million over 10 years by requiring insurers to bid to participate in the plans. Investors should exercise caution before buying shares of these companies, including the five on the accompanying table. These stocks received overall grades in the C range, the equivalent of a "hold" recommendation. Even before the president's budget was made public, TheStreet.com Ratings gave four of these stocks D-range risk grades on a scale of A-plus to E-minus. The lone exception, WellPoint ( WLP), had a C-minus mark, one step from "very cautious" territory. The stocks have been trading at less than 10 times earnings expected by analysts this year. In light of Obama's proposals, investors should look hard at the companies' higher-than-average risk grades.
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