Dickinson, who is among dozens of women alleging that Cosby molested them, is suing Cosby for defamation over statements last year denying the comedian raped Dickinson in 1982.
The ruling states Dickinson's lawyers can only seek answers as to whether the denials were made maliciously. Dickinson never reported the rape to authorities.
The lawsuit is one of several filed against Cosby. Singer has denied Cosby raped Dickinson. Cosby has never been charged in connection with any of the allegations.
See photos of Janice Dickinson:
Judge orders Cosby deposition in Janice Dickinson lawsuit
BEVERLY HILLS, CA - SEPTEMBER 14: Janice Dickinson attends the Genlux concert with Chris Botti at Luxe Rodeo Drive Hotel on September 14, 2014 in Beverly Hills, California. (Photo by Michael Zorn/Getty Images)
Janice Dickinson arrives at the American Idol Finale on Wednesday, May 23, 2012 in Los Angeles. (Photo by Jordan Strauss/Invision/AP)
Janice Dickinson arrives at the premiere for "Pirates of the Caribbean: At World's End" in Anaheim, Calif., Saturday, May 19, 2007. (AP Photo/Matt Sayles)
Model Janice Dickinson poses prior to the Ed Hardy Fall 2007 fashion show, during the Mercedes Benz Fashion Week at Smashbox Studios in Culver City, Calif., on Monday, March 19, 2007. (AP Photo/Matt Sayles)
Model Janice Dickinson arrives for the Billboard Music Awards in Las Vegas, Monday, Dec. 4, 2006. (AP Photo/Chris Carlson)
Janice Dickinson walks the runway in the 'Fashion for Relief' show Friday, Sept. 16, 2005 in New York. 'Fashion for Relief' was the final show of Fashion Week in New York and all funds from the ticket sales went to benefit AmeriCares. (AP Photo/Diane Bondareff)
Actress Janice Dickinson attends the T-Mobile Sidekick 3 launch party in Los Angeles, Tuesday, June 20, 2006. (AP Photo/Lucas Jackson)
378684 15: Janice Dickinson arrives at a party to launch Madonna's new album 'Music' September 19, 2000 in Los Angeles, CA. (Photo by Chris Weeks/Liaison)
Janice Dickinson (Photo by Albert L. Ortega/WireImage)
UNITED STATES - CIRCA 2002: Supermodel Janice Dickinson squeezes pal Ingrid Seynhaeve backstage as they take part in the Fashion for Relief runway show at the tents in Bryant Park on the last day of Fashion Week. The one-time-only event brought together 82 looks from 42 different brands - from Baby Phat to Burberry - modeled by celebrities and catwalkers, to benefit the victims of Hurricane Katrina. (Photo by Richard Corkery/NY Daily News Archive via Getty Images)