Marissa Lorena Walczak, FNP-BC

Primary specialty

Family Nurse PractitionerTaxonomy code 363LF0000X

License

13864-33 Issued in WI

Practice address

2900 S Wisconsin Ave
Rice Lake, WI 54868-8578

Phone

(715) 997-3915

NPI assigned

Feb 17, 2023

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

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, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

MCHS Hospitals IncGroup PAC ID 5698071173, 1,195 clinicians

Lakeview Medical Center Inc of Rice LakeGroup PAC ID 6103737820, 168 clinicians

Oakleaf Clinics IncGroup PAC ID 4486831328, 103 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Marshfield Medical Center - Rice Lake Hospital, Rice Lake, WI, CCN 520011
• Marshfield Medical Center - Minocqua Hospital, Minocqua, WI, CCN 520212
• Marshfield Medical Center Hospital, Marshfield, WI, CCN 520037
• Marshfield Medical Center - Eau Claire Hospital, Eau Claire, WI, CCN 520210

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

Merit-based Incentive Payment System (MIPS)

Final score

82.72 of 100Reported as group

Quality

64.71

Promoting interoperability

100

Improvement activities

40

Cost

65.56

Medicare enrollment (NPD)

Enrolled

Credentials

Nurse Practitioner

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: mwalczak38026@oakleafmed.gardenplot.direct-ci.com
• Direct secure messaging: him@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 and National Provider Directory roles.

• Lakeview Medical Center Inc of Rice Lake

  • Clinic/Center
  • Rice Lake, WI
  • NPI 1093201832
  Medicare reassignment Care Compare group NPD
• MCHS Hospitals Inc

  • Clinic/Center
  • Marshfield, WI
  • NPI 1093221434
  Medicare reassignment Care Compare group NPD
• Oakleaf Clinics Inc

  • Internal Medicine Physician
  • Eau Claire, WI
  • NPI 1295127082

  Nurse Practitioner

  Medicare reassignment Care Compare group NPD
• Beaver Dam Community Hospitals Inc

  • Clinic/Center
  • Beaver Dam, WI
  • NPI 1972188555
  Medicare reassignment NPD
• Flambeau Hospital Inc

  • Clinic/Center
  • Park Falls, WI
  • NPI 1194317966
  Medicare reassignment NPD
• Flambeau Hospital Inc

  • Critical Access Hospital
  • Park Falls, WI
  • NPI 1700963048
  Medicare reassignment NPD
• Marshfield Clinic Inc

  • Clinic/Center
  • Marshfield, WI
  • NPI 1952347981
  Medicare reassignment NPD
• Memorial Hospital Inc

  • Critical Access Hospital
  • Neillsville, WI
  • NPI 1346239373
  Medicare reassignment NPD
• Beaver Dam Community Hospitals Inc

  • Pharmacy
  • Beaver Dam, WI
  • NPI 1295771780
  NPD
• MCHS Hospitals Inc

  • Clinic/Center
  • Stevens Point, WI
  • NPI 1467119784
  NPD
• MCHS Hospitals Inc

  • Durable Medical Equipment & Medical Supplies
  • Eau Claire, WI
  • NPI 1558230847
  NPD
• Oakleaf Clinics Inc

  • Internal Medicine Physician
  • Eau Claire, WI
  • NPI 1306238191

  Nurse Practitioner

  NPD

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

• Lakeview Medical Center Inc of Rice Lake

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

  • Rural Acute Care Hospital
  • Minocqua, WI
  • NPI 1376197665
  Care Compare affiliation
• MCHS Hospitals Inc

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

  • General Acute Care Hospital
  • Eau Claire, WI
  • NPI 1952809816
  Care Compare affiliation

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

{
    "created_epoch": "1676592000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1788307200000",
    "number": "1871291906",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "2403 FOLSOM ST",
            "city": "EAU CLAIRE",
            "state": "WI",
            "postal_code": "547032435"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2900 S WISCONSIN AVE",
            "city": "RICE LAKE",
            "state": "WI",
            "postal_code": "548688578",
            "telephone_number": "715-997-3915"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "WALCZAK",
        "first_name": "MARISSA",
        "middle_name": "LORENA",
        "credential": "FNP-BC",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2023-02-17",
        "last_updated": "2026-09-02",
        "certification_date": "2026-09-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363LF0000X",
            "taxonomy_group": "",
            "desc": "Nurse Practitioner, Family",
            "state": "WI",
            "license": "13864-33",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "him@marshfieldclinichealthsystem.cernerdirect.com",
            "affiliation": "N",
            "address_1": "1700 W Stout St",
            "city": "Rice Lake",
            "state": "WI",
            "country_code": "US",
            "postal_code": "548685000",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Shauna Michele Vojtasek
• Mark Richard Vrieze, P.T.
• Wal-Mart Stores East LP
• Wal-Mart Stores East, LP
• Wal-Mart Stores East, LP
• John B Waldron, MD
• Walgreen Co
• Amanda Waller
• Carrie Wamhoff
• Mark C. Waters, D.D.S.

• Family Nurse Practitioner in Rice Lake, WI
• Providers in Rice 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 Sep 2, 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.