NPI Portal NPI Lookup & Verification

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

Craig Mark Mason, M.D.

Ophthalmology Physician in Fargo, ND · enumerated 2005.

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

National Provider Identifier

1366428666

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Registry record

Entity type Individual (Type 1)
Name Craig Mark Mason
Credential M.D.
Sex Male
Practice address Fargo, ND, 58103
Phone (701) 293-9829
Fax (701) 293-0111
Enumeration date Dec 19, 2005
Last updated in NPPES Sep 9, 2011

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

Taxonomy & licenses

207W00000X Ophthalmology Physician Allopathic & Osteopathic Physicians · License 9082 (ND) 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
22104 Other ND BLUE CROSS AND BLUE SHIEL
11965 Medicaid ND -
180045594 Other - RAILROAD MEDICARE
0800996 Other - MEDICA
214T1MA Other MN BLUE CROSS AND BLUE SHIEL
831015700 Medicaid MN -
0144775 Other - CIGNA
1031279 Other - PREFERRED ONE
6300620 Medicaid SD -

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

What is the NPI number for Craig Mason?
The National Provider Identifier (NPI) for Craig Mason is 1366428666, a Type 1 (individual) record in the CMS NPPES registry.
Where does Craig Mason practice?
The practice location on file with NPPES is in Fargo, ND. Providers can have multiple locations; NPPES lists the primary practice address.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-09-09.