Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marc D Herwitz, OD

Q: What is the NPI number for Marc Herwitz?

The National Provider Identifier (NPI) for Marc Herwitz is 1023088879, a Type 1 (individual) record in the CMS NPPES registry.

Optometrist in Bethesda, MD · enumerated 2006.

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

National Provider Identifier

1023088879

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Registry record

Entity type Individual (Type 1)

Name Marc D Herwitz

Credential OD

Sex Male

Practice address 8901 Rockville Pike, Bethesda, MD, 20889

Phone (301) 319-7001

Enumeration date Jan 25, 2006

Last updated in NPPES Feb 16, 2017

Taxonomy & licenses

152W00000X Optometrist Eye and Vision Services Providers · License 046008230 (IL) Primary

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Marc Herwitz practice?

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

What is the NPI number for Marc Herwitz?

The National Provider Identifier (NPI) for Marc Herwitz is 1023088879, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-16.