Corey Haim -- 'Poster Child' For Rx Abuse

Corey Haim went to seven different doctors and seven pharmacies to get 553 pills ... and that was just in a little more than the first two months of this year ... according to California Attorney General Jerry Brown.

Brown says several of the doctors were at urgent care centers. TMZ broke the story that Haim's mom had complained to several urgent care centers that they were fueling her son with prescription drugs.

Some of the drugs Haim scored were Xanax, Soma, Vicodin and Valium. According to Brown, five days before Corey died he obtained 149 tablets of Vicodin, 195 tablets of Valium, 15 tablets of Xanax and 195 tablets of Soma.

TMZ also broke the story that 20 doctors have received subpoenas for medical records in connection with the Haim investigation by the L.A. County Coroner. We're told some of the doctors never saw or wrote prescriptions for Haim -- leaving the possibility that Haim forged the prescriptions.

Haim's cause of death has not yet been determined.