Nathaniel D Fagan-Duerr, MSN, APNP, FNP-C

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

10958-33 Issued in WI

Practice address

725 American Ave
Waukesha, WI 53188-5031

Phone

(262) 928-1000

NPI assigned

Feb 28, 2021

Sex

Male

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

Enrolled in WI

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Enrollment records 1

Specialty

Nurse Practitioner

Education

Other, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Prohealth Medical Group IncGroup PAC ID 3476465188, 475 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Waukesha Memorial Hospital Hospital, Waukesha, WI, CCN 520008

Medicare enrollment (NPD)

Enrolled

Credentials

Master of Science - Nursing

State licenses

Practice roles

Locations

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.

• Prohealth Medical Group Inc.

  • Pediatrics Physician
  • Waukesha, WI
  • NPI 1356322440

  Family Medicine

  Medicare reassignment Care Compare group NPD
• Milwaukee Internal Medicine Associates Inc

  • Multi-Specialty Clinic/Center
  • Milwaukee, WI
  • NPI 1457531345
  Medicare reassignment NPD
• Signify Health Medical Associates, PLLC

  • General Practice Physician
  • Dallas, TX
  • NPI 1750845863

  WI

  Medicare reassignment NPD
• Prohealth Medical Group Inc

  • Internal Medicine Physician
  • Watertown, WI
  • NPI 1629119417

  Family Medicine

  NPD
• Prohealth Medical Group Inc

  • Family Medicine Physician
  • Waukesha, WI
  • NPI 1790720613
  NPD (past)

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

• Prohealth Waukesha Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Waukesha, WI
  • NPI 1629056890
  Care Compare affiliation

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

{
    "created_epoch": "1614470400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762387200000",
    "number": "1548854755",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7733 W BURLEIGH ST",
            "city": "MILWAUKEE",
            "state": "WI",
            "postal_code": "532225003",
            "telephone_number": "414-837-6300"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "725 AMERICAN AVE",
            "city": "WAUKESHA",
            "state": "WI",
            "postal_code": "531885031",
            "telephone_number": "262-928-1000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FAGAN-DUERR",
        "first_name": "NATHANIEL",
        "middle_name": "D",
        "name_prefix": "Mr.",
        "credential": "MSN, APNP, FNP-C",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2021-02-28",
        "last_updated": "2025-11-06",
        "certification_date": "2025-11-06",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "WI",
            "license": "10958-33",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jillian Louise Ewing Haas, M.D.
• Albert Charles Exner, D.D.S.
• Emma Louise Exner, SAC-IT, CSW
• Thomas Exner, D.D.S.
• Eye Clinic of Waukesha LLC
• Allison Fahey, APNP
• Joseph L Fahl, D.D.S.
• Kay Andrea Fahl, RDH
• Melissa Fairbank
• Gretchen Fairweather, CAPSW

• Family Nurse Practitioner in Waukesha, WI
• Providers in Waukesha, WI by specialty
• Family Nurse Practitioner in Wisconsin

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 6, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.