Most retirees and pre-retirees worry about their health in retirement and how they will pay for any unforeseen healthcare costs. Nationwide Financial has launched its Personal Health Care Assessment to help advisors estimate their clients' health care expenses in retirement.

According to the Congressional Budget Office, Medicare provides health coverage to 46 million older or disabled Americans, but it only covers about 51 percent of the expenses associated with health care services.

"Most Americans aren't thinking about—much less planning for—their health care costs in retirement. Many assume their employers will continue to pay their premiums during retirement or erroneously believe that Medicare will cover all health care expenses," said John Carter, president of Nationwide Financial Distributors, Inc. "The good news is that consumers want help: presenting a large opportunity for advisors."