Low levels of eight drugs, including both prescription and over-the counter medications, were found in his system along with marijuana, coroner's spokesman Craig Harvey said.
"But nothing was at a level that would have contributed to his death," Harvey said.
The drugs included common cold and flu medications, such as ibuprofen and a cough-suppressant, he said.
Haim, who struggled with drug problems throughout his life, died March 10 after collapsing in his mother's apartment. He had been suffering from flu-like symptoms.
California Attorney General Jerry Brown said in April that Haim employed "doctor shopping" to obtain 553 prescription pills -- including powerful sedatives such as Valium and Xanax and painkillers such as Vicodin and Oxycontin -- in the two months before his death. Brown called Haim -- the star of 1980s films such as "The Lost Boys" and "License to Drive" -- a poster child for prescription drug abuse.
However, no Oxycontin was found in his body, Harvey said.
Mark Heaslip, the actor's agent, did not return a phone message seeking comment Tuesday.