Gregory Mason, MD
NPI 1437292976 · Hospitalist Physician · Duluth, MN
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Mason, MD is a Hospitalist Physician provider in Duluth, MN (NPI 1437292976).
Provider details
- NPI number
- 1437292976
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 49567 (MN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-15
- Last updated
- 2024-04-23
- Certified
- 2024-04-23
Frequently asked questions
- What is Gregory Mason's NPI number?
- Gregory Mason's National Provider Identifier (NPI) is 1437292976, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Mason's specialty?
- Gregory Mason is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Mason located?
- Gregory Mason's practice location on file with NPPES is 400 East 3rd Street, Duluth, MN 55805.
- What is Gregory Mason's phone number?
- The practice phone number listed in the NPPES registry for Gregory Mason is (218) 786-8364.
- Does Gregory Mason accept Medicare?
- Gregory Mason is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Mason's NPI active?
- Yes — Gregory Mason's NPI (1437292976) is active in the NPPES registry as of the last update on 2024-04-23.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.