The UnitedHealth Group, one of the largest health insurance companies in the U.S., has announced that it will begin offering hearing aids as part of its myriad of health care products. The company has introduced four different kinds of hearing aids each made by IntriCon Corp., a manufacturer of small medical devices. UnitedHealth has begun offering hearing aids as part of a way to promote Medicare enrollment. The company will be offering hearing aids for eligible Medicare plan members at retail prices, which will be lower than prices found outside…