Tracy M Diefenbach, PHD MRMS CCTP

Primary specialty

Research Study SpecialistTaxonomy code 1744R1102X

Practice address

816 2ND St NE
Fosston, MN 56542-1519

Phone

(218) 637-0399

NPI assigned

Sep 16, 2021

Last updated

Sep 18, 2025By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Philosophy

Practice roles

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

• The MRMS Research Foundation

  • Research Study Specialist
  • Fosston, MN
  • NPI 1033081310
  NPD Authorized official

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

{
    "created_epoch": "1631750400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758153600000",
    "number": "1649940115",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "816 2ND ST NE",
            "city": "FOSSTON",
            "state": "MN",
            "postal_code": "565421519",
            "telephone_number": "218-637-0399"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "816 2ND ST NE",
            "city": "FOSSTON",
            "state": "MN",
            "postal_code": "565421519",
            "telephone_number": "218-637-0399"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DIEFENBACH",
        "first_name": "TRACY",
        "middle_name": "M",
        "name_prefix": "Dr.",
        "credential": "PHD MRMS CCTP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2021-09-16",
        "last_updated": "2025-09-18",
        "certification_date": "2025-09-18",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "1744R1102X",
            "taxonomy_group": "",
            "desc": "Specialist, Research Study",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Breah Christianson, FNP
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• Maija L Duppong
• First Care Medical Services (Essentia Health Fosston Clinic)
• First Care Medical Services (First Care Living Center)
• First Care Medical Services (Essentia Health Fosston)
• First Care Medical Services (Essentia Health Oklee Clinic)

• Research Study Specialist in Fosston, MN
• Providers in Fosston, MN by specialty
• Research Study Specialist in Minnesota

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 18, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.