Kellsey Mary Fellbaum, DNP, FNP-BC

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

10426 Issued in WI

Practice address

1200 Port Arthur Rd
Ladysmith, WI 54848-1137

Phone

(715) 532-5561

NPI assigned

Dec 21, 2020

Last updated

Dec 10, 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 2

Addresses

Electronic endpoints 1

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

MCHS Hospitals IncGroup PAC ID 5698071173, shared by 28 NPIs, 1,195 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Marshfield Medical Center - Ladysmith Hospital, Ladysmith, WI, CCN 521328
• Marshfield Medical Center Hospital, Marshfield, WI, CCN 520037
• Marshfield Medical Center - Rice Lake Hospital, Rice Lake, WI, CCN 520011

Merit-based Incentive Payment System (MIPS)

Final score

80.58 of 100Reported as group

Quality

55.5

Promoting interoperability

100

Improvement activities

40

Cost

71.46

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: him@marshfieldclinichealthsystem.cernerdirect.com
• Direct secure messaging: kellsey.provos@marshfieldclinichealthsystem.cernerdirect.com

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.

• Marshfield Clinic Inc

  dba Marshfield Clinic Florida Teleradiology/Telehealth

  • Clinic/Center
  • Marshfield, WI
  • NPI 1952347981
  Medicare reassignment NPD
• MCHS Hospitals Inc

  dba Marshfield Medical Center

  • Clinic/Center
  • Marshfield, WI
  • NPI 1093221434
  Medicare reassignment NPD
• MCHS Hospitals Inc

  dba Marshfield Medical Center - Ladysmith

  • Critical Access Hospital
  • Ladysmith, WI
  • NPI 1952890873
  Medicare reassignment NPD
• MCHS Hospitals Inc

  dba Marshfield Medical Center - Eau Claire Cancer Center

  • Durable Medical Equipment & Medical Supplies
  • Eau Claire, WI
  • NPI 1558230847
  NPD
• Memorial Hospital Inc

  dba Marshfield Medical Center - Neillsville Clinic

  • Rural Health Clinic/Center
  • Neillsville, WI
  • NPI 1619966793
  NPD (past)

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

• Lakeview Medical Center Inc of Rice Lake

  dba Marshfield Medical Center - Rice Lake

  • Rural Acute Care Hospital
  • Rice Lake, WI
  • NPI 1154415024
  Care Compare affiliation
• MCHS Hospitals Inc

  dba Marshfield Medical Center

  • Rural Acute Care Hospital
  • Marshfield, WI
  • NPI 1942749387
  Care Compare affiliation
• MCHS Hospitals Inc

  dba Marshfield Medical Center - Ladysmith

  • Critical Access Hospital
  • Ladysmith, WI
  • NPI 1952890873
  Care Compare affiliation

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

{
    "created_epoch": "1608508800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765324800000",
    "number": "1811584147",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1000 N OAK AVE",
            "city": "MARSHFIELD",
            "state": "WI",
            "postal_code": "544495703",
            "telephone_number": "715-387-5511"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1200 PORT ARTHUR RD",
            "city": "LADYSMITH",
            "state": "WI",
            "postal_code": "548481137",
            "telephone_number": "715-532-5561"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FELLBAUM",
        "first_name": "KELLSEY",
        "middle_name": "MARY",
        "credential": "DNP, FNP-BC",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2020-12-21",
        "last_updated": "2025-12-10",
        "certification_date": "2025-12-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "WI",
            "license": "10426",
            "primary": true
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "WI",
            "license": "10426",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "him@marshfieldclinichealthsystem.cernerdirect.com",
            "affiliation": "N",
            "address_1": "906 College Ave W",
            "city": "Ladysmith",
            "state": "WI",
            "country_code": "US",
            "postal_code": "548482198",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Tonya Marie Evjen, RDH
• Express Medical Incorporated
• Maria Fairbert, P.T. AIDE
• Family Health Center of Marshfield Inc (Family Health Center - Ladysmith Alcohol & Drug Recovery Center)
• Family Health Center of Marshfield Inc (Family Health Center - Ladysmith Dental Center)
• R Timothy Fitzner, MD
• Flambeau Pharmacy
• Shay Kohana Freeman, SAC-IT
• Butch Terence D Geroy, PT
• Kryselle C Geroy, PT

• Family Nurse Practitioner in Ladysmith, WI
• Providers in Ladysmith, 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 Dec 10, 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.