Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Gregory Allen Olson, O.D.
Optometrist in Westminster, MD · enumerated 2007.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1265577183
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Registry record
Entity type Individual (Type 1)
Name Dr. Gregory Allen Olson
Credential O.D.
Sex Male
Practice address 400 N Center St, Westminster, MD, 21157
Phone (410) 857-4200
Fax (410) 848-9295
Enumeration date Feb 20, 2007
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 579820 | Other | MD | HIGHMARK BLUE CROSS |
| 08568 | Other | MD | SPECTERA |
| 2143327 | Other | MD | MAMSI |
| 2124 | Other | MD | BALTIMORE CITY VISION |
| 210412 | Other | MD | NATIONAL VISION ADMIN |
| 16626 | Other | MD | AVESIS |
| 44452 | Other | MD | DAVIS VISION |
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 Olson practice?
The practice location on file with NPPES is in Westminster, MD. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Gregory Olson?
The National Provider Identifier (NPI) for Gregory Olson is 1265577183, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.