Up to 310,000 Affordable Care Act health plan enrollees will lose coverage unless they supply proof of citizenship or legal residence in the United States by Sept. 5, according to The Wall Street Journal. HealthCare.gov couldn't verify either of these qualifications for nearly one million people when open enrollment ended in April. The government resolved about 450,000 of these cases, but many exchange enrollees now face their last chance to prove they qualify for health insurance benefits. Of those who haven't responded to the government's requests for more information, about 93,800 live in Florida and another 52,700 are in Texas. Critics of the ACA cite problems verifying enrollment eligibility as evidence that the government can't prevent fraud in the exchanges, the WSJ noted. Article (subscription required).