In substance, this plan would repeal just three parts of the ACA, according to several sources familiar with the approach. It would eliminate the requirement that most Americans carry health insurance as well as the requirement that employers with at least 50 full-time employees offer coverage to their workers. Both are central elements of the 2010 health-care law and its least popular aspects with the public.
The “skinny” plan also would rescind the tax on medical devices, one of several taxes the ACA created to help pay for other elements of the law.
https://www.washingtonpost.com/news/powerpost/wp/2017/07/25/skinny-repeal-could-be-the-senates-health-care-bill-of-last-resort/