A good read on Medicaid and non-citizens:

"How Obamacare became a lifeline to refugees and immigrants"
[...] The high enrollment among this groups in many ways represents the exact goals Democratic legislators had in mind when they passed the health care law ...(Bushra Rahameed) said she only felt completely safe in the United States when she signed up for Obamacare’s Medicaid expansion ...
http://www.msn.com/en-us/news/us/how-obamacare-became-a-lifeline-to-refugees-and-immigrants/ar-AAoRauT