Prosecutors in Montgomery County had reopened the case that year after The Associated Press fought to unseal portions of Cosby's decade-old deposition testimony in accuser Andrea Constand's sex assault and defamation lawsuit against Cosby, which he had settled in 2006.
Dozens of other accusers had come forward since then to accuse Cosby, long beloved as 'America's Dad' because of his hit 1980s sitcom, of similar misconduct.
Montgomery County Judge Stephen O'Neill allowed just one of them to testify at Cosby's first trial in 2017, which ended with an acquittal.
But a year later, after the #MeToo movement exploded in the wake of reporting on Hollywood mogul Harvey Weinstein, the judge allowed five other accusers to testify at the retrial. The jury convicted Cosby on all three felony sex-assault counts.
Lawyer Brian W. Perry argued in the appeal that letting other accusers testify 'flips constitutional jurisprudence on its head, and the `presumption of guilt,´ rather than the presumption of innocence, becomes the premise.'
Spokesman Andrew Wyatt said Cosby was 'extremely thankful' the court would hear the case.
He said the decision comes as demonstrators across the nation protest the death of black people at the hands of police and expose the 'corruption that lies within the criminal justice system.'
'As we have all stated, the false conviction of Bill Cosby is so much bigger than him - it's about the destruction of ALL Black people and people of color in America,' Wyatt said in a statement.
Cosby´s lawyers also challenged his classification as a sexually violent predator subject to lifetime supervision. The actor, who insists he had a consensual encounter with accuser Constand, has said he would never express remorse to the parole board.
His wife, Camille Cosby, said days after the decision that the #MeToo movement needs to 'clean up their act' and that she doesn't 'care' about the feelings of the more than 50 women who have accused her husband of drugging and sexually assaulting them.