A portion of the case unsealed by a Douglas County judge Tuesday shows the sexual assault charges are Class 3 and Class 4 felonies, which carry a sentence of between two years to life in prison. They involve a helpless victim.
Other details of the case remain sealed.
The alleged offense occurred Sept. 6 and was reported Oct. 28.
Cox, who played in the Broncos' loss to the Arizona Cardinals on Sunday, is free on $50,000 bail.
Cox could face a four-game suspension from the NFL next season for violating the league's personal conduct code. Commissioner Roger Goodell doesn't need for a player to be convicted to punish him.
The district attorney's office has declined to comment on the charges. Cox defense attorney Vince Buckmelter did not immediately return a message left at his office.
In addition to a lengthy prison sentence if convicted, Cox could also face 10 years to life of probation.