Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
John F. Brennan, MD
Nephrology Physician in Racine, WI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1154351153
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Registry record
Entity type Individual (Type 1)
Name John F. Brennan
Credential MD
Sex Male
Practice address 3803 Spring Street, Suite 600, Racine, WI, 53405
Phone (262) 687-8312
Fax (262) 687-8796
Enumeration date Jul 4, 2006
Last updated in NPPES Mar 24, 2026
Taxonomy & licenses
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 37698 (WI) Secondary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD 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.
Frequently asked questions
Where does John Brennan practice?
The practice location on file with NPPES is in Racine, WI. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Brennan?
The National Provider Identifier (NPI) for John Brennan is 1154351153, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-03-24.