Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Gregory Mason, MD

Hospitalist Physician in Duluth, MN · enumerated 2007.

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

National Provider Identifier

1437292976

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Registry record

Entity type Individual (Type 1)

Name Gregory Mason

Credential MD

Sex Male

Practice address 400 East 3rd Street, Duluth, MN, 55805

Phone (218) 786-8364

Enumeration date Feb 15, 2007

Last updated in NPPES Apr 23, 2024

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License 49567 (MN) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 49567 (MN) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

How do I verify Gregory Mason's NPI record?

Cross-check NPI 1437292976 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1437292976 active?

Yes, as of the latest NPPES snapshot, NPI 1437292976 is active (record last updated 2024-04-23).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-04-23.