Mr Trump, who has pledged to repeal the 2010 law, said he will keep the ban on insurers denying coverage for pre-existing conditions.
He told the Wall Street Journal that he also favoured allowing young adults to be insured on their parents’ policies.
“I like those very much,” Mr Trump said of the two pillars of the bill.
It was his meeting with Mr Obama on Thursday that had made him reconsider his calls for an all-out replacement of the Affordable Care Act, he told the newspaper. Asked whether he would implement a campaign promise to appoint a special prosecutor to investigate his defeated Democratic opponent Hillary Clinton over her use of a private email server while secretary of state, Mr Trump said: “It’s not something I’ve given a lot of thought, because I want to solve healthcare, jobs, border control, tax reform.”