The deadline to start coverage by Feb. 1 is midnight.
The amount of uninsured Hoosiers fell to just under 12% last year.
The rejection comes after the Supreme Court ordered the 7th Circuit Court of Appeals to reconsider its first ruling denying Notre Dame's protest.
New legislation could alter the definition of a full-time work week.
Transgender youth often have trouble finding the money to pay for transitioning surgeries, but insurance is starting to cover more of the transition process.
A federal judge rejected Notre Dame's request for an injunction to the contraceptive clause of the Affordable Care Act.
Nearly 2,800 Hoosiers signed up for insurance in November, compared to 700 in October.
A recent Kaiser Health poll showed only 12 percent of the uninsured knew the exchanges were going online Monday.
Under the Affordable Care Act, employers with fifty or more employees will need to provide health insurance to those working more than 30 hours per week.
Legislators considered a state constitutional amendment on hunting and fishing and a bill creating the Indiana Career Council and debated expanding Medicaid.