Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Miss Marlene R San Nicolas, O.D.
Optometrist in Tamuning, GU · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1154381515
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Registry record
Entity type Individual (Type 1)
Name Miss Marlene R San Nicolas
Credential O.D.
Sex Female
Practice address 415 Chalan San Antonio, Suite 111-113, Tamuning, GU, 96913
Phone (671) 648-3350
Fax (671) 647-3546
Enumeration date Mar 28, 2006
Last updated in NPPES Feb 27, 2013
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 Marlene San Nicolas?
Marlene San Nicolas 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
Browse all → Gregory Burton Ophthalmology Physician · Tamuning, GU NPI 1003884297 Eyal Margalit Ophthalmology Physician · Tamuning, GU NPI 1366491268 James Mcdarby Ophthalmology Physician · Tamuning, GU NPI 1033297403 Tom Veloria General Practice Dentistry · Tamuning, GU NPI 1821329285 Collette Supit Dentist · Tamuning, GU NPI 1427475300
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-02-27.