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Diamond Pharmacy Services is the nation’s largest correctional pharmacy provider and Pennsylvania’s largest independently-owned long term care pharmacy. Founded in Indiana, Pennsylvania, in 1970 as a family-owned retail pharmacy, our business expanded greatly in the following decades thanks to a focus on customer service, competitive pricing, and innovation. We entered the correctional pharmacy market in 1983 and in 2001 surpassed our competition to earn the “nation’s largest” status. We currently serve over 700,000 correctional patients in 49 states. Today, Diamond remains a family-owned community institution, employing over 1,000 people in the greater Indiana County area and beyond. The centerpiece of our operations is a 135,000 square foot institutional pharmacy facility. We also operate retail pharmacy and medical supply stores and satellite pharmacy facilities in Eastern Pennsylvania and Ohio to serve long-term care customers. Diamond also oversees an institutional medical supply division; Sapphire Health, a developer of electronic medical record (eMAR) and electronic health record (EHR) software; InnovaScript, a retail mail order pharmacy service and pharmacy benefit manager; and RemedyRepack, an FDA-registered drug repackager. While the look of our business has changed over the past 50 years, our feel for dedicated, personalized customer service remains the same.

Diamond Pharmacy Services Questions

The Diamond Pharmacy Services annual revenue was $241.7 million in 2026.

Mark Zilner is the President and CEO Owner of Diamond Pharmacy Services.

152 people are employed at Diamond Pharmacy Services.

Diamond Pharmacy Services is based in Indiana, Pennsylvania.

The NAICS codes for Diamond Pharmacy Services are [44, 45, 456].

The SIC codes for Diamond Pharmacy Services are [59, 591].

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