A federal probe found that operators on Medicare Part D hotlines often get it wrong--providing accurate information to callers only 40 percent of the time in some instances. GAO investigators called the Medicare hotline 500 times in late January and early February. The review was requested by congressional Democrats, who are pointing at the report as evidence that the benefit's startup phase was mishandled. CMS administrator Mark McClellan disputed the findings, noting that the test took place early on before wrinkles in the program were ironed out. "I'm very concerned with it being incomplete, inaccurate and out-of-date," McClellan said. Article (WSJ sub. req.)