Nine former prisoners have told the BBC that they were held in a separate building, and subjected to abuse.
The US military says the main prison, now called the Detention Facility in Parwan, is the only detention facility on the base.
However it has said it will look into the abuse allegations made to the BBC.
The International Committee of the Red Cross (ICRC) said that since August 2009 US authorities have been notifying it of names of detained people in a separate facility at Bagram.
The ICRC was responding to a question from the BBC about the existence of the facility, which many former prisoners refer to as the “Tor Jail” which translates as the “black jail”.
In recent weeks the BBC has logged the testimonies of nine prisoners who say they were held there.
They told consistent stories of being held in isolation in cold cells where a light is on all day and night.
They said they had been deprived of sleep by US military personnel there.
In response to these allegations, Vice Adm Robert Harward, in charge of US detentions in Afghanistan, denied the existence of such a facility or abuses.
He told the BBC that the Parwan Detention Facility, was the only US detention centre in the country.
Filed under: Censorship, Civil Liberties, Drugs, Information, Military Industrial Complex Tagged: | Afghanistan, Bagram, Bagram Air Base, disinformation, fascism, human rights, Imperialism, International Committee of the Red Cross, misinformation, Parwan, petroleum, Propaganda, Robert Harward, torture, War on Afghanistan