CHICAGO (CBS) — A security breach at Northwestern Memorial.

The hospital said a temp worker got access to patient records they were not allowed to see. The hospital has banned that temp worker.

READ MORE: Judge Bars Chicago Police Union President John Catanzara From Encouraging Officers To Defy City's Vaccine Mandate

The person looked up medical records for more than a month. But there was no access to insurance information or Social Security numbers.

READ MORE: Survivor Of Kenosha Protests Shooting Sues City, Claims Police Enabled Shooter Kyle Rittenhouse

Northwestern said there’s no evidence of fraud, but patients should double check any bills they get.

MORE NEWS: 16-Year-Old Girl Shot And Killed In Lawndale

Also From CBS Chicago: