NPI Portal NPI Lookup & Verification

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

Dan N Olson, M.D.

Internal Medicine Physician in Cortland, OH · enumerated 2006 · practices at Trumbull Mahoning Medical Group, Inc..

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

National Provider Identifier

1417981077

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Registry record

Entity type Individual (Type 1)
Name Dan N Olson
Credential M.D.
Sex Male
Practice address Cortland, OH, 44410
Phone (330) 372-8800
Fax (330) 372-8999
Enumeration date Jul 10, 2006
Last updated in NPPES Apr 20, 2008

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 35045552 (OH) Primary
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
000000243190 Other OH ANTHEM BC/BS
400885 Other OH UNITED HEALTHCARE
78934 Other OH HEALTH ASSURANCE
J45552 Other OH SUMMACARE
Q022608 Other OH HOMETOWN
0465527 Medicaid OH -
341341025039 Other OH CARESOURCE

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.

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Frequently asked questions

Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
What specialty is Dan Olson?
Dan Olson is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-20.