The former Saturday Night Live star fractured ribs and injured his back when his car collided with another vehicle in the Hamptons, reports Page Six.
Lawyers for Hammond have filed a lawsuit against the other driver, claiming that the actor has been unable to stand for long periods of time since the crash.
Attorney Melanie Little insisted that Hammond's ability to perform stand-up comedy has been severely affected, saying: "He's in pain and had to cancel many performances. He can't fly and he can't stand up."
The comic is seeking unspecified damages in the suit.
Hammond first joined Saturday Night Live in 1995, soon becoming popular for his impressions of Bill Clinton, Donald Trump and Hardball host Chris Matthews.
He left SNL in 2009 after a 14-year run on the programme, but has returned sporadically for guest appearances.
> Jimmy Fallon to host Saturday Night Live
Watch Darrell Hammond play Bill Clinton on SNL below (US only):