Publicist Nancy Seltzer said Wednesday that Harold fractured his shoulder, and "Housewives" creator and executive producer Marc Cherry said he apparently has swelling on the brain but is expected to recover.
"We're hearing he's going to be fine, but he's going to be recovering for a couple of weeks," Cherry said.
Selzer said no one else was injured, but did not provide further details on the Tuesday wreck, which was first reported by TMZ. The California Highway Patrol said it had no information about the accident.
Harold plays Jackson, the boyfriend of Teri Hatcher's character Susan Mayer on the ABC show. The character plays a pivotal role in the fifth season's eighth episode, a November sweeps installment which finds several Wisteria Lane residents trapped inside a nightclub fire.
Cherry said Harold had been filming scenes all week for the episode and had been scheduled to be on set Tuesday. He said they would await the actor's prognosis before deciding how to proceed, but that at least some changes would have to be made.
"We know we're going to rewrite one scene," he said.