Elizabeth Mattes Nielsen, MD

Primary specialty

Pulmonary Disease PhysicianTaxonomy code 207RP1001X

License

76831 Issued in WI

Practice address

1155 N Honey Creek Pkwy
Wauwatosa, WI 53213-3189

Phone

(414) 615-5900

NPI assigned

Jun 19, 2016

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 6

Addresses

Other identifiers 1

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in IL, IN, WI3 enrollments

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 3

Specialty

Hospice/Palliative CareAlso: Internal Medicine

Education

Other, 2015

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Midwest Critical Care SCGroup PAC ID 4486026804, 49 clinicians

Prohealth Medical Group IncGroup PAC ID 3476465188, 475 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Ascension Columbia St Marys Hospital Milwaukee Hospital, Milwaukee, WI, CCN 520051
• Waukesha Memorial Hospital Hospital, Waukesha, WI, CCN 520008
• Oconomowoc Memorial Hospital Hospital, Oconomowoc, WI, CCN 520062

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: enielsen@direct.iuhealth.org
• Direct secure messaging: enielsen164441@direct.phci.org

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.

• Midwest Critical Care SC

  • Critical Care Medicine (Internal Medicine) Physician
  • Mount Pleasant, WI
  • NPI 1093425647
  Medicare reassignment Care Compare group NPD
• Prohealth Medical Group Inc.

  • Pediatrics Physician
  • Waukesha, WI
  • NPI 1356322440

  Internal Medicine

  Medicare reassignment Care Compare group NPD
• Arnett Clinic, LLC

  • Internal Medicine Physician
  • Lafayette, IN
  • NPI 1164490843
  Medicare reassignment NPD
• Prohealth Medical Group Inc

  • Family Medicine Physician
  • Waukesha, WI
  • NPI 1760523559

  Internal Medicine

  NPD
• Arnett Clinic, LLC

  • Durable Medical Equipment & Medical Supplies
  • Lafayette, IN
  • NPI 1699839563
  NPD
• Arnett Clinic, LLC

  • Clinical Medical Laboratory
  • Lafayette, IN
  • NPI 1881655090
  NPD
• Prohealth Medical Group Inc

  • Family Medicine Physician
  • Waukesha, WI
  • NPI 1790720613

  Internal Medicine

  NPD (past)

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

• Columbia St. Mary'S Hospital Milwaukee, Inc.

  • General Acute Care Hospital
  • Milwaukee, WI
  • NPI 1871656082
  Care Compare affiliation
• Prohealth Oconomowoc Memorial Hospital, Inc.

  • General Acute Care Hospital
  • Oconomowoc, WI
  • NPI 1366420531
  Care Compare affiliation
• Prohealth Oconomowoc Memorial Hospital, Inc.

  • Community/Retail Pharmacy
  • Oconomowoc, WI
  • NPI 1497942205

  Hospital

  Care Compare affiliation
• 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": "1466294400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783987200000",
    "number": "1861842007",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 735044",
            "city": "CHICAGO",
            "state": "IL",
            "postal_code": "606735044",
            "telephone_number": "800-326-2250"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1155 N HONEY CREEK PKWY",
            "city": "WAUWATOSA",
            "state": "WI",
            "postal_code": "532133189",
            "telephone_number": "414-615-5900"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2300 N Edward St",
            "address_purpose": "LOCATION",
            "city": "Decatur",
            "state": "IL",
            "postal_code": "625264163",
            "country_code": "US",
            "telephone_number": "217-876-4200",
            "fax_number": "217-876-4209",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "725 American Ave",
            "address_purpose": "LOCATION",
            "city": "Waukesha",
            "state": "WI",
            "postal_code": "531885031",
            "country_code": "US",
            "telephone_number": "262-928-3000",
            "fax_number": "262-953-8814",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "Memorial Medical Ctr",
            "address_2": "701 N First Street",
            "address_purpose": "LOCATION",
            "city": "Springfield",
            "state": "IL",
            "postal_code": "627810001",
            "country_code": "US",
            "telephone_number": "217-545-0193",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "NIELSEN",
        "first_name": "ELIZABETH",
        "middle_name": "MATTES",
        "credential": "MD",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2016-06-19",
        "last_updated": "2026-07-14",
        "certification_date": "2026-07-14",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "IL",
            "license": "036147784",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "WI",
            "license": "76831",
            "primary": true
        },
        {
            "code": "207RC0200X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Critical Care Medicine",
            "state": "WI",
            "license": "76831",
            "primary": false
        },
        {
            "code": "207RP1001X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Pulmonary Disease",
            "state": "IL",
            "license": "036147784",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IL",
            "license": "125.068567",
            "primary": false
        },
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "IN",
            "license": "01089069A",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "100243376",
            "state": "WI"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "enielsen@direct.iuhealth.org",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "address_1": "5165 McCarty Ln",
            "city": "Lafayette",
            "state": "IN",
            "country_code": "US",
            "postal_code": "479058764",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

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• Pulmonary Disease Physician in Wauwatosa, WI
• Providers in Wauwatosa, WI by specialty
• Pulmonary Disease Physician in Wisconsin

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 14, 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.