An estimated 500 youth in Indiana age out of foster care system every year and when they do, they will lose health insurance if they don’t re-enroll.

Cigna officials announced Tuesday they had sued Anthem in a Delaware court seeking a judge’s affirmation that the company had lawfully ducked out of the merger agreement.

An analysis by the AP and Avalere Health finds most Indiana counties have three or more marketplace insurers offering coverage for 2017.

The ruling leaves in place a trial court and state appeals court decision that ruled a hospital will have to release information about how it charges and offers discounts to insured patients.

Earlier this year, United Healthcare announced it was exiting Indiana’s individual marketplace, and last month, Fort Wayne-based Physicians Health Plan of Northern Indiana followed suit.

Indiana is one of 14 states where a single insurer holds at least 50 percent of the market.

The Affordable Care Act and Healthy Indiana Plan have helped provide hundreds of thousands of Hoosiers with health insurance.

The nonprofit will continue to sell small group plans, but is dropping all its individual products, both on and off the Affordable Care Act marketplace.

If completed, the Anthem-Cigna merger could be among the largest in history. But before the takeover happens, the companies need to prove the deal won’t violate federal anti-trust laws.

Anthem’s deal with Connecticut-based Cigna had been in the works for more than a year. However, in recent months experts started speculating about the feasibility of the $48 billion merger, reasoning the deal could potentially violate anti-trust laws.