(Undated) -- Medicare open enrollment is underway right now and runs through December 7th. Nicole Duritz with AARP says this is the time of year that folks who utilize Medicare for their health care coverage make decisions for the coming year. Duritz talks about the four C's, cost, coverage, convenience and customer service. She says when it comes to cost, a lot of people look at their monthly premium and go no further. It's important, she says, to take a look at how your health care needs have changed in the past year and make sure to adjust your coverage to best fit those changes.