Did you apply ACA obamacare in healthcare.gov? Because I tried and it said my identity is not verified. Then I googled it said:
Can I get health insurance while green card is pending?
Coverage for New and Pending Green Card Holders
If you're in the U.S. on a visitor's visa and your children or family has applied for a family-sponsored green card, you're considered a visitor until your green card is processed. During this waiting period, you may be eligible for a visitors health insurance plan.
So I do not know.