Nearly 23 million Americans get health insurance through one of the online “exchanges” (also called “marketplaces”) that operate under the 2010 Affordable Care Act, or ACA. Most receive subsidies from the federal government to lower their premiums and out-of-pocket costs.

The House Ways and Means Committee will hear testimony Thursday afternoon from a group of health insurance CEOs as premiums skyrocket following the expiration of Affordable Care Act subsidies.