Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William T Mayr, MD

Q: What is the NPI number for William Mayr?

The National Provider Identifier (NPI) for William Mayr is 1235123555, a Type 1 (individual) record in the CMS NPPES registry.

Neurology Physician in Columbus, OH · enumerated 2005.

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

National Provider Identifier

1235123555

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Registry record

Entity type Individual (Type 1)

Name William T Mayr

Credential MD

Sex Male

Practice address 1480 W Lane Ave, Columbus, OH, 43221

Phone (614) 533-5500

Fax (614) 533-0103

Enumeration date Sep 1, 2005

Last updated in NPPES Aug 2, 2024

Taxonomy & licenses

2084N0600X Clinical Neurophysiology Physician Allopathic & Osteopathic Physicians · License 35-082299 (OH) Secondary

2084N0400X Neurology Physician Allopathic & Osteopathic Physicians · License 35-082299 (OH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
2407630	Medicaid	OH	-

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 William Mayr practice?

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

What is the NPI number for William Mayr?

The National Provider Identifier (NPI) for William Mayr is 1235123555, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-08-02.