NPIMap

Individual provider Active NPI

David J Mast, MD

  • Internal Medicine Physician
  • Duluth, MN
National Provider Identifier
1912958331
Registry record updated Jul 13, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
30485 Issued in MN
Practice address
1001 E Superior St
Ste L401
Duluth, MN 55802-2207
Phone
(218) 249-7960
NPI assigned
May 12, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 13, 2026

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 30485 MN Primary

Addresses

Primary practice location

1001 E Superior St
Ste L401
Duluth, MN 55802-2207

Mailing address

1001 E Superior St
Ste L401
Duluth, MN 55802-2207
Phone (218) 249-7960

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in MN
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20100116000265 MN Practitioner - Internal Medicine 4688586258 Reassigns benefits to 1 organization

Care Compare profile

Medicare Care Compare
Specialty
Internal Medicine
Education
University of Minnesota Medical School, 1985
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
St. Luke'S Hospital of DuluthGroup PAC ID 7113834839, 409 clinicians
Polinsky Medical Rehabilitation CenterGroup PAC ID 0941377360, 369 clinicians

Practice addresses (Care Compare)

1015 E 1St St
Duluth, MN 55805-2242
Phone (218) 249-7860

1600 Miller Trunk Hwy
BLDG C
Duluth, MN 55811-5640
Phone (218) 786-5360

Hospital & facility affiliations

  • Aspirus St. Luke'S at Home - Home Care - Duluth Home health agency, Duluth, MN, CCN 247098
  • Aspirus St. Luke'S at Home-Hospice-Duluth Hospice, Duluth, MN, CCN 241524
  • St Lukes Hospital Hospital, Duluth, MN, CCN 240047
  • Aspirus Lake View Hospital Hospital, Two Harbors, MN, CCN 241308
  • Essentia Health Duluth Hospital, Duluth, MN, CCN 240019

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

Practice roles

OrganizationSpecialtyStatusNew patients
St. Luke'S Hospital of Duluth CurrentSince May 13, 2002 Accepting new patients
St. Luke'S Hospital of Duluth Internal Medicine CurrentSince May 13, 2002 Accepting new patients
St. Luke'S Hospital of Duluth Current Accepting new patients
St. Luke'S Hospital of Duluth Past Accepting new patients
St. Luke'S Hospital of Duluth Past Accepting new patients

Locations

29980 Network Pl
Chicago, IL 60673

1001 E Superior St
Ste L401
Duluth, MN 55802
Phone (218) 249-7960

915 E 1st St
Duluth, MN 55805
Phone (218) 249-5352

1015 E 1st St
Duluth, MN 55805
Phone (218) 249-7860

Interoperability endpoints

  • Direct secure messaging: dmast237503@direct.aspirus.org

Organizations & group practices 6

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

Hospital & facility affiliations 31

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

View all 31

NPI Registry JSON

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1147392000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1912958331",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1001 E SUPERIOR ST",
            "address_2": "STE L401",
            "city": "DULUTH",
            "state": "MN",
            "postal_code": "558022207",
            "telephone_number": "218-249-7960"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1001 E SUPERIOR ST",
            "address_2": "STE L401",
            "city": "DULUTH",
            "state": "MN",
            "postal_code": "558022207",
            "telephone_number": "218-249-7960"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAST",
        "first_name": "DAVID",
        "middle_name": "J",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-05-12",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "MN",
            "license": "30485",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Duluth, MN

Sources for this page

Verify at the official NPI Registry.