A new study from the University of Chicago’s NORC has found that inpatient hospital drug costs per admission increased by more than 38 percent between 2013 and 2015, according to the American Hospital Association (AHA).

NORC, an independent research institution, analyzed inpatient drug pricing data from 712 community hospitals and two group purchasing organizations (GPO) representing more than 1,400 community hospitals. It said the price increases appear to be “random, inconsistent and unpredictable” for low- and high-volume drugs and for branded and generic drugs.

The report was commissioned by the AHA and Federation of American Hospitals (FAH). Read the full story here.