Margaret Mary Mussfeldt, APNP

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

16574-33 Issued in WI

Practice address

113 4TH Ave
Shell Lake, WI 54871-4457

Phone

(715) 468-2711

Fax

(715) 468-2727

NPI assigned

Sep 25, 2024

Last updated

Jan 19, 2026By 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

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, 2024

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Indianhead Medical Center Shell Lake, Inc.Group PAC ID 6406748839, 12 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Indianhead Medical Ctr Hospital, Shell Lake, WI, CCN 521342

Medicare enrollment (NPD)

Enrolled

State licenses

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.

• Indianhead Medical Center Shell Lake, Inc

  • Critical Access Hospital
  • Shell Lake, WI
  • NPI 1568438125
  Medicare reassignment Care Compare group
• Indianhead Medical Center Shell Lake Inc

  • Medicare Defined Swing Bed Hospital Unit
  • Shell Lake, WI
  • NPI 1871500769
  NPD (past)

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

• Indianhead Medical Center Shell Lake, Inc

  • Critical Access Hospital
  • Shell Lake, WI
  • NPI 1568438125
  Care Compare affiliation

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

{
    "created_epoch": "1727222400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1768780800000",
    "number": "1376360610",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "113 4TH AVE",
            "city": "SHELL LAKE",
            "state": "WI",
            "postal_code": "548714457",
            "telephone_number": "715-468-2711",
            "fax_number": "715-468-2727"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "113 4TH AVE",
            "city": "SHELL LAKE",
            "state": "WI",
            "postal_code": "548714457",
            "telephone_number": "715-468-2711",
            "fax_number": "715-468-2727"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MUSSFELDT",
        "first_name": "MARGARET",
        "middle_name": "MARY",
        "credential": "APNP",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2024-09-25",
        "last_updated": "2026-01-19",
        "certification_date": "2026-01-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "WI",
            "license": "16574-33",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• James L Merrick, OT
• Matthew Michael Meyer, M.A. LPC-IT
• Midstate Medical, Inc
• Amber Marie Miller, LPC
• Wendy Muska
• Brian Nord
• Richard L Olson, CRNA
• Sara Haynes Olson, APRN
• Jimmy A Reidt, DC
• Catherine F Reuter, MD

• Family Nurse Practitioner in Shell Lake, WI
• Providers in Shell Lake, 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 Jan 19, 2026; 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.