Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Mark M Ainsworth, O.D.

Optometrist in Herkimer, NY · enumerated 2005 · practices at Mark M. Ainsworth.

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

National Provider Identifier

1255318861

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Registry record

Entity type Individual (Type 1)

Name Mark M Ainsworth

Credential O.D.

Sex Male

Practice address Herkimer, NY, 13350

Phone (315) 866-9667

Fax (315) 866-9668

Enumeration date Dec 23, 2005

Last updated in NPPES Aug 1, 2024

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

332H00000X Eyewear Supplier Suppliers · License TUV005303-1 (NY) Secondary

152W00000X Optometrist Eye and Vision Services Providers · License TUV005303-1 (NY) 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
117251	Other	NY	EYEMED
522109986	Other	NY	BCBS
493	Other	NY	DAVIS
01912927	Medicaid	NY	-
NY5303	Other	NY	VISION BENEFITS OF AMERIC
05742	Other	NY	SPECTERA
595064	Other	NY	MVP

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Mark Ainsworth practice?

The practice location on file with NPPES is in Herkimer, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Mark Ainsworth?

The National Provider Identifier (NPI) for Mark Ainsworth is 1255318861, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Mark M. Ainsworth Eyewear Supplier · Herkimer, NY NPI 1215113667

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-01.