WASHINGTON — While House Republicans lined up votes Wednesday for a Thursday showdown over their bill to repeal the Affordable Care Act, Vickie Glenn sat in her Murphysboro, Ill., office and prayed for it to fail.

Ms. Glenn, a Medicaid coordinator for Tri-County Special Education, an Illinois cooperative that helps more than 20 school districts deliver special education services to students, was worried about an issue that few in Congress were discussing: how the new American Health Care Act, with its deep cuts to Medicaid, would affect her 2,500 students.

With all the sweeping changes the Republican bill would impose, little attention has been paid to its potential impact on education. School districts rely on Medicaid, the federal health care program for the poor, to provide costly services to millions of students with disabilities across the country. For nearly 30 years, Medicaid has helped school systems cover costs for special education services and equipment, from physical therapists to feeding tubes. The money is also used to provide preventive care, such as vision and hearing screenings, for other Medicaid-eligible children.

“If I could have 10 minutes with President Trump, I could help him understand what we do, why it’s important,” Ms. Glenn said. “If he understood, he would protect it, because this isn’t Republicans and Democrats. It’s just kids.”