Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Janis Faith Mertz, OD

Optometrist in Plymouth, MA · enumerated 2005.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1518966449

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Registry record

Entity type Individual (Type 1)

Name Dr. Janis Faith Mertz

Credential OD

Sex Female

Practice address 36 Cordage Park Cir, Suite 108, Plymouth, MA, 02360

Phone (508) 747-3937

Fax (508) 747-0104

Enumeration date Jul 21, 2005

Last updated in NPPES Sep 15, 2010

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 3047 (MA) Primary

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
0356638	Medicaid	MA	-

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.

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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 Janis Mertz?

Janis Mertz 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 2010-09-15.