NPI Portal NPI Lookup & Verification

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

Dr. David Brennan, D.O.

Family Medicine Physician in Clinton, IA · enumerated 2006.

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

National Provider Identifier

1306887906

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Registry record

Entity type Individual (Type 1)
Name Dr. David Brennan
Credential D.O.
Sex Male
Practice address Clinton, IA, 52732
Phone (563) 242-3208
Fax (563) 242-4051
Enumeration date Jun 8, 2006
Last updated in NPPES Jun 9, 2011

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

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License 02378 (IA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier Type State Issuer
8203935 Medicaid IA -

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 David Brennan?
The National Provider Identifier (NPI) for David Brennan is 1306887906, a Type 1 (individual) record in the CMS NPPES registry.
Where does David Brennan practice?
The practice location on file with NPPES is in Clinton, IA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-06-09.