NPIMap

Individual provider Active NPI

Nathan H Mustain, M.D.

  • Family Medicine Physician
  • Holmen, WI
National Provider Identifier
1285078741
Registry record updated Sep 23, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Family Medicine PhysicianTaxonomy code 207Q00000X
License
65954-20 Issued in WI
Practice address
500 N Holmen Dr
Holmen, WI 54636-9350
Phone
(608) 399-3091
NPI assigned
Apr 26, 2013
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Sep 23, 2025

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Family Medicine Physician 207Q00000X 65954-20 WI Primary

Addresses

Primary practice location

500 N Holmen Dr
Holmen, WI 54636-9350

Mailing address

1836 South Ave
La Crosse, WI 54601-5429
Phone (608) 782-7300

Other identifiers 1

IdentifierTypeStateIssuer
1285078741MedicaidWI

Electronic endpoints 2

TypeEndpointUseAffiliation
FHIR URL https://fhir.ssmhc.com/fhir/api/FHIR/DSTU2/ Other
Direct Messaging Address nmustain259866@direct-ehr-ssmhc.com Direct

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
I20161004000532 WI Practitioner - Family Practice 2961623228 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Family Practice
Education
University of Minnesota Medical School, 2013
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Gundersen Clinic LTDGroup PAC ID 9638082779, 422 clinicians

Practice addresses (Care Compare)

500 N Holmen Dr
Suite 502
Holmen, WI 54636-7301
Phone (608) 782-7300

Hospital & facility affiliations

Procedures performed for Medicare patients

ProcedureNumber of procedures
Removal of skin lesions14
Removal or shaving of skin growth1-10

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
65954-20WIMDFamily Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Gundersen Clinic, LTD. CurrentSince Sep 29, 2025 Accepting new patients
Gundersen Lutheran Medical Center, Inc CurrentSince Sep 29, 2025 Accepting new patients
Gundersen Lutheran Express Care, Inc CurrentSince Sep 29, 2025 Accepting new patients
Gundersen Lutheran Medical Center, Inc CurrentSince Sep 29, 2025 Accepting new patients
Gundersen Clinic LTD Current Accepting new patients
Gundersen Lutheran Medical Center Inc Current Accepting new patients
Gundersen Clinic, LTD. PastSince Sep 28, 2025 Accepting new patients
Gundersen Clinic, LTD. Past Accepting new patients

Locations

500 N Holmen Dr
Ste 502
Holmen, WI 54636
Phone (608) 399-3091

500 N Holmen Dr
Holmen, WI 54636
Phone (608) 399-3091

1836 South Ave
La Crosse, WI 54601
Phone (608) 788-8102

1910 South Ave
La Crosse, WI 54601
Phone (608) 775-2287

1600 Main St
Onalaska, WI 54650
Phone (608) 783-4681

Interoperability endpoints

  • Direct secure messaging: nmustain1130717@direct.emplifyhealth.org
  • Direct secure messaging: nmustain259866@direct-ehr-ssmhc.com

Organizations & group practices 8

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.

Hospital & facility affiliations 10

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": "1366934400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1758585600000",
    "number": "1285078741",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1836 SOUTH AVE",
            "city": "LA CROSSE",
            "state": "WI",
            "postal_code": "546015429",
            "telephone_number": "608-782-7300"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "500 N HOLMEN DR",
            "city": "HOLMEN",
            "state": "WI",
            "postal_code": "546369350",
            "telephone_number": "608-399-3091"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MUSTAIN",
        "first_name": "NATHAN",
        "middle_name": "H",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2013-04-26",
        "last_updated": "2025-09-23",
        "certification_date": "2025-09-23",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "WI",
            "license": "65954-20",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1285078741",
            "state": "WI"
        }
    ],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://fhir.ssmhc.com/fhir/api/FHIR/DSTU2/",
            "affiliation": "N",
            "use": "OTHER",
            "useDescription": "Other",
            "useOtherDescription": "FHIR API",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "CCD",
            "address_1": "1700 Tuttle St",
            "city": "Baraboo",
            "state": "WI",
            "country_code": "US",
            "postal_code": "539133319",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "nmustain259866@direct-ehr-ssmhc.com",
            "affiliation": "N",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "nmustain259866@direct-ehr-ssmhc.com",
            "address_1": "1700 Tuttle St",
            "city": "Baraboo",
            "state": "WI",
            "country_code": "US",
            "postal_code": "539133319",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Holmen, WI

Sources for this page

Verify at the official NPI Registry.