Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. Harold Michael Olson IV, D.C.
Chiropractor in Bigfork, MN · enumerated 2011.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1679871909
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Registry record
Entity type Individual (Type 1)
Name Dr. Harold Michael Olson IV
Credential D.C.
Sex Male
Practice address 258 Pine Tree Drive, Bigfork, MN, 56628
Phone (218) 743-3559
Enumeration date Mar 10, 2011
Last updated in NPPES Mar 10, 2011
Taxonomy & licenses
DC · Doctor of Chiropractic: A licensed chiropractor focusing on musculoskeletal and nervous system disorders.
About the DC 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 Harold Olson practice?
The practice location on file with NPPES is in Bigfork, MN. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Harold Olson?
The National Provider Identifier (NPI) for Harold Olson is 1679871909, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-10.