NPIMap

Individual provider Active NPI

Nathan A Blankenheim, MD

  • Emergency Medicine Physician
  • Eau Claire, WI
National Provider Identifier
1871989657
Registry record updated Sep 10, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Emergency Medicine PhysicianTaxonomy code 207P00000X
License
66977 Issued in WI
Practice address
1400 Bellinger Street
Eau Claire, WI 54703-5222
Phone
(715) 838-5222
NPI assigned
Apr 8, 2015
Last updated
Sep 10, 2026By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 10, 2026

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Emergency Medicine Physician 207P00000X 66977 WI Primary

Addresses

Primary practice location

1400 Bellinger Street
Eau Claire, WI 54703-5222

Mailing address

PO Box 860912
Provider Enrollment
Minneapolis, MN 55486-0912
Phone (715) 838-5222

Other practice location 1

UW Hospital and Clinics
600 Highland Ave
Madison, WI 53792-0001
Phone (608) 890-8682

Other practice location 2

2116 Craig Rd
Eau Claire, WI 54701-6118
Phone (715) 858-8184

Other practice location 3

1222 E Woodland Ave
Barron, WI 54812-1765
Phone (715) 838-5222

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address nblankenheim2204543@ehrdirect.mayoclinicmsg.org

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in WI
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20180817001233 WI Practitioner - Emergency Medicine 9931405537 Reassigns benefits to 8 organizations

Care Compare profile

Medicare Care Compare
Specialty
Emergency Medicine
Education
Other, 2015
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Mayo Clinic Health System-Northwest Wisconsin Region IncGroup PAC ID 4385553627, shared by 21 NPIs, 797 clinicians

Practice addresses (Care Compare)

1222 E Woodland Ave
Barron, WI 54812-1765
Phone (715) 537-3166

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
5982WIMDNurse Practitioner

Practice roles

OrganizationSpecialtyStatusNew patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. CurrentSince Aug 12, 2024 Accepting new patients
Lakeview Medical Center Inc of Rice Lake CurrentSince May 28, 2021 Accepting new patients
MCHS Hospitals Inc Emergency Medicine CurrentSince Mar 5, 2019 Accepting new patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. CurrentSince Feb 10, 2026 Accepting new patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. CurrentSince Aug 12, 2024 Accepting new patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. Current Accepting new patients
Lakeview Medical Center Inc of Rice Lake CurrentSince May 28, 2021 Accepting new patients
MCHS Hospitals Inc CurrentSince Mar 5, 2019 Accepting new patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. CurrentSince Feb 10, 2026 Accepting new patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. Current Accepting new patients
Mayo Clinic Health System-Northwest Wisconsin Region, Inc. CurrentSince Feb 10, 2026 Accepting new patients
Marshfield Clinic Inc CurrentSince Jul 23, 2018 Accepting new patients

Locations

200 1st St SW
Rochester, MN 55905
Phone (507) 266-4850

1222 E Woodland Ave
Barron, WI 54812
Phone (715) 537-3166

1501 Thompson St
Bloomer, WI 54724
Phone (715) 568-2000

1000 Starr Ave
Eau Claire, WI 54703
Phone (715) 858-4850

1400 Bellinger St
Eau Claire, WI 54703
Phone (715) 838-3311

2116 Craig Rd
Eau Claire, WI 54701
Phone (715) 858-4500

3501 Golf Rd
Eau Claire, WI 54701
Phone (715) 858-4200

733 W Clairemont Ave
Eau Claire, WI 54701
Phone (715) 838-3806

1000 N Oak Ave
Marshfield, WI 54449
Phone (715) 387-5111

2321 Stout Rd
Menomonie, WI 54751
Phone (715) 235-5531

13025 8th St
Osseo, WI 54758
Phone (715) 597-2575

1700 W Stout St
Rice Lake, WI 54868
Phone (715) 236-6133

Interoperability endpoints

  • Direct secure messaging: nathan.blankenheim@marshfieldclinichealthsystem.cernerdirect.com

Organizations & group practices 12

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.

Hospital & facility affiliations 3

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

NPI Registry JSON

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

{
    "created_epoch": "1428451200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1788998400000",
    "number": "1871989657",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 860912",
            "address_2": "PROVIDER ENROLLMENT",
            "city": "MINNEAPOLIS",
            "state": "MN",
            "postal_code": "554860912",
            "telephone_number": "715-838-5222"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1400 BELLINGER STREET",
            "city": "EAU CLAIRE",
            "state": "WI",
            "postal_code": "547035222",
            "telephone_number": "715-838-5222"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "UW Hospital and Clinics",
            "address_2": "600 Highland Ave",
            "address_purpose": "LOCATION",
            "city": "Madison",
            "state": "WI",
            "postal_code": "537920001",
            "country_code": "US",
            "telephone_number": "608-890-8682",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "2116 Craig Rd",
            "address_purpose": "LOCATION",
            "city": "Eau Claire",
            "state": "WI",
            "postal_code": "547016118",
            "country_code": "US",
            "telephone_number": "715-858-8184",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1222 E Woodland Ave",
            "address_purpose": "LOCATION",
            "city": "Barron",
            "state": "WI",
            "postal_code": "548121765",
            "country_code": "US",
            "telephone_number": "715-838-5222",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BLANKENHEIM",
        "first_name": "NATHAN",
        "middle_name": "A",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-04-08",
        "last_updated": "2026-09-10",
        "certification_date": "2026-09-10",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "WI",
            "license": "66977",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "nblankenheim2204543@ehrdirect.mayoclinicmsg.org",
            "affiliation": "N",
            "address_1": "1400 Bellinger Street",
            "city": "EAU CLAIRE",
            "state": "WI",
            "country_code": "US",
            "postal_code": "547035222",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Eau Claire, WI

Sources for this page

Verify at the official NPI Registry.