Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John J. O'Brien, DDS

Q: What is the NPI number for John O'Brien?

The National Provider Identifier (NPI) for John O'Brien is 1811208333, a Type 1 (individual) record in the CMS NPPES registry.

General Practice Dentistry in Marshfield, WI · enumerated 2010.

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

National Provider Identifier

1811208333

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Registry record

Entity type Individual (Type 1)

Name John J. O'Brien

Credential DDS

Sex Male

Practice address 1307 N Saint Joseph Ave, Marshfield, WI, 54449

Phone (715) 221-5600

Enumeration date Jun 30, 2010

Last updated in NPPES Jun 10, 2013

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 6543 (WI) Primary

DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS credential

Other identifiers

Identifier	Type	State	Issuer
APPR	Medicaid	WI	-

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 John O'Brien practice?

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

What is the NPI number for John O'Brien?

The National Provider Identifier (NPI) for John O'Brien is 1811208333, 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 2013-06-10.