Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. William Harold Olson, DDS
Dentist in Grand Forks, ND · enumerated 2006.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1801994124
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Registry record
Entity type Individual (Type 1)
Name Dr. William Harold Olson
Credential DDS
Sex Male
Practice address 2810 17th Ave South, Grand Forks, ND, 58201
Phone (701) 775-0641
Fax (701) 746-9328
Enumeration date Sep 20, 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 |
|---|---|---|---|
| 788399 | Other | - | UNITED CONCORDIA |
| 901556 | Other | ND | DENTAL SERVICES CORP |
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
How do I verify William Olson's NPI record?
Cross-check NPI 1801994124 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1801994124 active?
Yes, as of the latest NPPES snapshot, NPI 1801994124 is active (record last updated 2007-07-08).
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.