Yep, it's on the homepage of healthcare.gov.
Time magazine reports: "No security breach has been detected but online healthcare enrollees are warned to change their passwords as a precaution against the programming flaw. The government is reportedly carrying out a review into the Heartbleed bug.
People who used the Obama administration’s healthcare.gov website to enroll in insurance plans under the government’s healthcare reform law are being warned to change their passwords in defense against the notorious Heartbleed internet security flaw.
'While there’s no indication that any personal information has ever been at risk, we have taken steps to address Heartbleed issues and reset consumers’ passwords out of an abundance of caution,' said a post on the website."