if you currently receive health insurance at work you likely don't need to do anything. the marketplaces are for people who either buy insurance on their own or have none now. in fact if your company offers you affordable health insurance (defined as no more than 9. 5% of your annual income and covering on average 60% of your medical costs) you won't want to switch plans. i just wrote about this issue on the health reform 101 blog in greater detail. that will help to better explain why sticking with employer-based health insurance is for most people the right way to go.
does aca coverage cost me anything and if it does can i opt out of it if my company's insurance coverage is superior?