Top executives from state hospital associations will fly to Washington this week to develop their strategy. Many also plan to visit offices on Capitol Hill, where they will warn of the potential damage if Congress repeals the health law without guaranteeing similar coverage for those who would lose it.

A coalition of consumers and liberal advocacy groups is spending more than $2 million on television advertisements urging Congress to stop its attack on the law. The ads, by the Alliance for Healthcare Security, are aimed at a handful of Republican senators, including Lisa Murkowski of Alaska, Jeff Flake and John McCain of Arizona, Susan Collins of Maine, Dean Heller of Nevada, Lamar Alexander and Mr. Corker of Tennessee, and Shelley Moore Capito of West Virginia.

But by Washington standards, that is a pittance. Pharmaceutical Research and Manufacturers of America, an industry lobbying group, set aside $150 million in 2009 to support the law’s passage.

Some lobbyists have tacitly accepted the likelihood that major provisions of the health law will be repealed, setting their sights instead on shaping its replacement. They fear that if they come out strongly in opposition to repealing the law, they will lose their seats at the table as congressional Republicans and the Trump administration negotiate a replacement.

For now, passage of the budget resolution this week looks likely. The real fight is expected to come two to three weeks from now, when two House committees and two Senate committees produce legislation to repeal the Affordable Care Act and must answer to Republicans who say a replacement measure must be ready at the same time.

At least a half-dozen Republican senators have expressed doubts about the Republican leadership strategy of using the budget resolution to fast-track legislation to repeal the law, with a delayed effective date to allow time to find a replacement in the future.