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

Dr. Mark Vincent Graytok, OD

Optometrist in Greensburg, PA · enumerated 2006 · practices at Penn Neuromuscular Diagnostics, LLC.

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

National Provider Identifier

1952373318

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Registry record

Entity type Individual (Type 1)
Name Dr. Mark Vincent Graytok
Credential OD
Sex Male
Practice address Greensburg, PA, 15601
Phone (724) 834-8033
Fax (724) 834-4290
Enumeration date Feb 1, 2006
Last updated in NPPES Jun 28, 2013

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

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License OEG001356 (PA) 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
533151 Other PA HIGHMARK BCBS
54317 Other PA HEALTH AMERICA HEATH ASS
250860 Other PA VPMC
0011668350003 Medicaid PA -
2090347 Other PA AETNA
251638621 Other PA UNITED HEALTHCARE

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

What is the NPI number for Mark Graytok?
The National Provider Identifier (NPI) for Mark Graytok is 1952373318, a Type 1 (individual) record in the CMS NPPES registry.
Where does Mark Graytok practice?
The practice location on file with NPPES is in Greensburg, PA. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-06-28.