Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Gregory J Rettger, RPH
Pharmacist in Greencastle, PA · enumerated 2013.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1831525831
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Registry record
Entity type Individual (Type 1)
Name Gregory J Rettger
Credential RPH
Sex Male
Practice address 305 W Baltimore St, Greencastle, PA, 17225
Phone (717) 593-0170
Enumeration date Sep 23, 2013
Last updated in NPPES Sep 23, 2013
Taxonomy & licenses
RPH · Registered Pharmacist: A licensed pharmacist registered with a state board of pharmacy.
About the RPH credential
What is an NPI number?
A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.
Frequently asked questions
Where does Gregory Rettger practice?
The practice location on file with NPPES is in Greencastle, PA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Gregory Rettger?
The National Provider Identifier (NPI) for Gregory Rettger is 1831525831, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-09-23.