Mercy begins operating 22 pharmacies in Dierbergs grocery store locations With the Dierbergs locations, Mercy now operates 34 retail pharmacies in St. Louis and 48 across its four-state system Credit: Google Maps Published: 6:45 AM CDT April 21, 2021 Updated: 6:45 AM CDT April 21, 2021 ST. LOUIS — All 22 pharmacies in Dierbergs Markets stores throughout the region took on the Mercy Pharmacy banner Monday, as the St. Louis-based health system completed its acquisition of grocer's traditional and specialty pharmacies. Financial terms of the deal, which was announced in January, were not disclosed. The health system is operating the pharmacies in their previous in-store locations under a long-term lease. Mercy officials said more than 150 former Dierbergs pharmacists, pharmacy technicians and other associates made the transition to Mercy. Dierbergs had offered pharmacy services since 1980.