Definitely state specific. I just went through the licensing process for residency, and for the state I'll be in (not CA) the application specifically stated you needed to include expunged offenses:
"Have you ever been convicted of a violation, plead Nolo Contedere, or entered a plea bargain to any federal, state or local statute, or ordinance, or are any formal charges pending; including use of illicit substances or operating a motor vehicle while intoxicated (Please include any offenses which have been expunged from your record)?"
This is relevant since the main reason schools ask this is because they need to know you can pass the background check to rotate at hospitals during medical school and ultimately to be hired by a hospital or licensed as a physician. (Also, I had been under the impression that while you can have a conviction expunged it doesn't erase the arrest record, etc...?) Who knows whether the OP's history would be enough for a licensing board to block the application or a hospital to decline a hire, but it's something the OP should also be aware of...
As always with legal issues, OP, consult a lawyer rather than SDN.