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

Dr. William John Stoffel Jr., D.D.S.

General Practice Dentistry in Dubuque, IA · enumerated 2006.

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

National Provider Identifier

1821019225

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Registry record

Entity type Individual (Type 1)

Name Dr. William John Stoffel Jr.

Credential D.D.S.

Sex Male

Practice address Dubuque, IA, 52002

Phone (563) 583-3521

Enumeration date Jul 21, 2006

Last updated in NPPES Sep 6, 2023

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

Taxonomy & licenses

1223G0001X General Practice Dentistry Dental Providers · License 6276 (IA) Primary

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

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Stoffel practice?

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

What is the NPI number for William Stoffel?

The National Provider Identifier (NPI) for William Stoffel is 1821019225, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-06.