There are 29 House districts where Republicans won by 12 points or less.
Below I've posted district-wide enrollment in ACA exchange-based Qualified Health Plans (QHPs), ACA Basic Health Plans (BHPs) and Medicaid via ACA expansion.
Across these 29 districts alone, a total of nearly 2.7 million Americans are at risk of either losing healthcare coverage entirely or, if they don't, having to deal with MASSIVE premium hikes and/or a MOUNTAIN of paperwork on a regular basis to keep it due to a combination of H.R. 1 (the "One Big Beautiful Bill Act") being implemented, the GOP allowing the IRA subsidies to expire at the end of this year, and the Trump Administration implementing CMS's recent "Integrity Rule" starting this fall.