Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
William Joseph Kellner, MD
Pediatrics Physician in De Pere, WI · enumerated 2005.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1841274693
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Registry record
Entity type Individual (Type 1)
Name William Joseph Kellner
Credential MD
Sex Male
Practice address 555 Redbird Cir, De Pere, WI, 54115
Phone (920) 338-6820
Enumeration date Dec 5, 2005
Last updated in NPPES Mar 14, 2014
Taxonomy & licenses
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure.
About the MD credential
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 23105 | Other | WI | LICENSE |
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 William Kellner practice?
The practice location on file with NPPES is in De Pere, WI. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for William Kellner?
The National Provider Identifier (NPI) for William Kellner is 1841274693, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all → Bozena Biernat Internal Medicine Physician · De Pere, WI NPI 1003890864 Karen Camilli Pediatrics Physician · De Pere, WI NPI 1619951498 Sherri Hoyman Pediatrics Physician · De Pere, WI NPI 1629052469 Steven Novotny Family Medicine Physician · De Pere, WI NPI 1427032069 Bellin Memorial Hospital Inc Family Medicine Physician · De Pere, WI NPI 1780646513 Bellin Memorial Hospital Inc Pediatrics Physician · De Pere, WI NPI 1235192592 Bellin Psychiatric Center Inc Mental Health Clinic/Center (Including Community Mental Health Center) · De Pere, WI NPI 1144283318 Green Bay Allergy,Asthma & Immunology Sc Internal Medicine Physician · De Pere, WI NPI 1467405589
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-03-14.