Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Stephen Gregory Buck, O.D.
Optometrist in Sumter, SC · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1649289539
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Registry record
Entity type Individual (Type 1)
Name Dr. Stephen Gregory Buck
Credential O.D.
Sex Male
Practice address 1283 Broad St, Sumter, SC, 29150
Phone (803) 920-2763
Fax (803) 905-8065
Enumeration date Aug 7, 2006
Last updated in NPPES Aug 28, 2012
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 |
|---|---|---|---|
| D05910 | Medicaid | SC | - |
| P00308477 | Other | SC | RAILROAD MEDICARE PROV # |
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
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Stephen Buck?
Stephen Buck is registered in NPPES with the primary taxonomy of Optometrist. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-08-28.