Ryan did not detail what changes are under consideration.
Vice President Mike Pence also spoke to House Republicans in the meeting, acknowledging that changes to the legislation - which heads to the House Budget Committee for approval tomorrow - are in the works. President Donald Trump has offered his support for Ryan's measure, while still meeting conservative lawmakers who have expressed serious doubts about the plan.
"This President is ready to put the full weight of his bully pulpit and all of his tools" behind the bill, Pence told Republicans, according to Congressman Kevin Cramer. "It was very important for us to hear that, because there are a lot of people who need that shoring up."
Pence's visit to Capitol Hill - which included meetings with influential blocs of Republicans, as well as individual members - came as part of a White House effort to salvage support for the embattled American Health Care Act, even as Trump's conservative allies told him the bill could be a political trap.