Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William Arthur Brennan, D.D.S.
Periodontics in Green Bay, WI · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1013931823
See something wrong? Report a correction
Registry record
Entity type Individual (Type 1)
Name Dr. William Arthur Brennan
Credential D.D.S.
Sex Male
Practice address 430 Main St, Green Bay, WI, 54301
Phone (920) 431-1745
Fax (920) 431-1715
Enumeration date Jul 26, 2006
Last updated in NPPES Jul 8, 2007
Taxonomy & licenses
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 |
|---|---|---|---|
| 33725800 | 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.
Frequently asked questions
Is NPI 1013931823 active?
Yes, as of the latest NPPES snapshot, NPI 1013931823 is active (record last updated 2007-07-08).
How do I verify William Brennan's NPI record?
Cross-check NPI 1013931823 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Other providers at this practice address
Browse all → Richard Gesker General Practice Dentistry · Green Bay, WI NPI 1326026527 Donald Zabrowski Dentist · Green Bay, WI NPI 1700803707 William Kline Pediatric Dentistry · Green Bay, WI NPI 1598789612 David Anderson Prosthodontics · Green Bay, WI NPI 1083624621 Timothy Flanigan Oral and Maxillofacial Surgery (Dentist) · Green Bay, WI NPI 1922019405 Noel Lapp Orthodontics and Dentofacial Orthopedics Dentistry · Green Bay, WI NPI 1598878944 Steven Kaminski Dentist · Green Bay, WI NPI 1205941960 Harvey Poling General Practice Dentistry · Green Bay, WI NPI 1114033438
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.