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The rapper - whose real name is Jarad A. Higgins - died in December 2019 at the age of 21 after having a seizure.
The Cook County Medical Examiner's Office says: "Higgins died as a result of oxycodone and codeine toxicity," and "the manner of death is accident."
These drugs are used to treat severe pain and contain opioids - they've been linked to an opioid crisis in the US.
Juice WRLD suffered a seizure during a police search of his private jet when it landed in at Chicago airport and later died in hospital.
Officers said at the time they found guns and drugs on his jet after receiving information that banned substances might be onboard.
The Cook County Medical Examiner's Office shared their findings on Twitter.