Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Marc A Swanson, OD
Optometrist in Palo Alto, CA · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1881762839
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Registry record
Entity type Individual (Type 1)
Name Marc A Swanson
Credential OD
Sex Male
Practice address 795 El Camino Real, Palo Alto, CA, 94301
Phone (650) 321-4121
Enumeration date Nov 30, 2006
Last updated in NPPES Mar 3, 2020
Taxonomy & licenses
OD · Doctor of Optometry: A licensed optometrist providing primary vision care, eye exams, and corrective lenses.
About the OD 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
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 Marc Swanson?
Marc Swanson 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.
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-03.