WASHINGTON — Brushing aside a veto threat, a House committee unanimously approved legislation blocking seven new rules that the Bush administration sought for the Medicaid program.

The rules would affect a variety of health care providers, from hospitals to rehab centers for the developmentally disabled to school-based clinics. A bill moving through the House would block the rules from going into effect until March 2009.

The rules, if enacted, would reduce federal spending by about $13 billion during the next five years.

Supporters of the moratorium say the changes sought by the administration shifted more costs onto states and the poor at a time when they can least afford it. But the administration says the rules prevent states from improperly shifting health costs onto the federal government.

The Health and Human Services secretary, Mike Leavitt, stated the administration’s view in a letter to leaders of the House Energy and Commerce Committee. He said the legislation “puts billions of dollars of federal funds at risk, and may turn back progress that has already been made to stop abusive state practices.”

Mr. Leavitt warned that the president’s senior advisers would recommend that the bill be vetoed.

The letter was sent before the House Energy and Commerce Committee considered approval of the moratorium legislation. Rep. John Dingell, a Democrat of Michigan, the committee’s chairman, and Rep. Joe Barton, a Republican of Texas, the ranking Republican, both voiced their support for the legislation.

“There is little support outside the four corners of HHS for these actions,” Mr. Dingell said of the regulations.

Mr. Barton said he supported some of the proposed regulations, but not others.

“I hope that in the time period while the moratorium is in place, we can work together not just on a committee level, but with the administration, to find a way to fine-tune some of the regulations and see if they can go into effect at some point in time,” Mr. Barton said.

The committee followed the lead of Messrs. Dingell and Barton, approving the legislation by a vote of 46-0.

Health care groups in the lawmakers’ home states have overwhelmingly opposed the administration’s proposals. Hospital groups sued the federal government in an effort to void two of the rules. Hospital administrators say the changes, which include eliminating payments to teaching hospitals for medical education, would make it harder to care for the poor and uninsured.

School officials say another rule prevented them from billing for transporting children to school from home and back, which would make it harder to ensure that children get proper medical care. Such care frequently includes speech and physical therapy.