Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Michael S Oholleran MD Inc

Q: What is the NPI number for Michael S Oholleran MD Inc?

The NPI for Michael S Oholleran MD Inc is 1821304759, a Type 2 (organization) record in the CMS NPPES registry.

Surgery Physician in San Carlos, CA · enumerated 2010 · authorized official Michael Oholleran, M.D..

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

National Provider Identifier

1821304759

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Registry record

Entity type Organization (Type 2)

Legal business name Michael S Oholleran MD Inc

Practice address 1303 San Carlos Ave, San Carlos, CA, 94070

Phone (650) 593-0965

Fax (650) 593-2379

Enumeration date Aug 30, 2010

Last updated in NPPES Aug 30, 2010

Taxonomy & classification

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License G394880 (CA) Primary

Authorized official

Name Michael Oholleran

Title M.D.

Phone (650) 593-0965

Other identifiers

Identifier	Type	State	Issuer
00G394880	Medicaid	CA	-

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

Who is the authorized official for Michael S Oholleran MD Inc?

NPPES lists Michael Oholleran (M.D.) as the authorized official for this organization.

What is the NPI number for Michael S Oholleran MD Inc?

The NPI for Michael S Oholleran MD Inc is 1821304759, a Type 2 (organization) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-08-30.