At least eight million Americans are now signed up for health care under the Affordable Care Act.
President Barack Obama spoke about the success of his signature law Thursday.
He said health care costs per person are down, and the law allows people to keep their doctors.
Obama also acknowledged that improvements can be made, but said critics are wrong to want to get rid of the whole law.
"If, in fact, this is working for a lot of people, but there are still improvements to make, why are we still having the conversation about repealing the whole thing, and why are we having folks say that any efforts to improve it are somehow handing Obama a victory?" he said. "This isn't about me."
The president said once children covered under their parents' plans and expansions in Medicare are counted, roughly 14 million people are covered under the act.