Charles LeClaire-USA TODAY Sports / Reuters

The NFL may soon have to reveal details it’s previously attempted to keep under wraps regarding a history of concussions.

New York State Supreme Court Justice Jeffrey K. Oing issued an order Monday to allow insurance companies to determine whether information regarding the dangers of concussions were known and withheld from players, according to Ken Belson of The New York Times.

The development is the latest stemming from a class-action lawsuit from more than 5,000 former NFL players brought against the league alleging fraud and negligence as it pertains to concussions.

A settlement for the class action covering nearly all retired players is near completion, with the total costs for medical obligations estimated to be in the range of $1 billion.

The NFL is expected to appeal the decision, which would shed light on how the most pressing issue facing the league today was handled over the past 20 years.