NPIMap

Individual provider Active NPI

Mason Gordon Fisher, M.D.

  • Surgical Critical Care Physician
  • La Crosse, WI
National Provider Identifier
1245452549
Registry record updated Mar 26, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Surgical Critical Care PhysicianTaxonomy code 2086S0102X
License
55044 Issued in WI
Practice address
1836 South Ave
La Crosse, WI 54601-5429
Phone
(608) 782-7300
NPI assigned
May 3, 2007
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Mar 26, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Surgery Physician 208600000X 55044 WI
Surgical Critical Care Physician 2086S0102X 55044 WI Primary

Addresses

Primary practice location

1836 South Ave
La Crosse, WI 54601-5429

Mailing address

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

Other identifiers 1

IdentifierTypeStateIssuer
1245452549MedicaidWI

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
I20110630000463 WI Practitioner - Critical Care (Intensivists)Practitioner - General Surgery 1658559265 Reassigns benefits to 2 organizations

Care Compare profile

Medicare Care Compare
Specialty
Critical Care (Intensivists)Also: General Surgery
Education
Ohio State University College of Medicine, 2003
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Gundersen Lutheran Medical Center IncGroup PAC ID 2163331414, 888 clinicians

Practice addresses (Care Compare)

1836 S Ave
La Crosse, WI 54601-5429
Phone (608) 783-7300

1910 S Ave
La Crosse, WI 54601-5467
Phone (608) 782-7300

2575 S 7TH St
Bethany Riverside
La Crosse, WI 54601-5429
Phone (608) 775-8200

Hospital & facility affiliations

  • Gundersen Lutheran Medical Center Hospital, La Crosse, WI, CCN 520087
  • Vernon Memorial Hospital Hospital, Viroqua, WI, CCN 521348

Procedures performed for Medicare patients

ProcedureNumber of procedures
Colonoscopy1-10
Upper gastrointestinal (GI) endoscopy for acid reflux1-10
Removal of tissue1-10

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
55044WIMDSurgery Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Gundersen Lutheran Medical Center Inc CurrentSince Jun 1, 2013 Accepting new patients
Gundersen Clinic LTD CurrentSince Jul 16, 2012 Accepting new patients
Gundersen Lutheran Express Care, Inc CurrentSince Jul 16, 2012 Accepting new patients
Gundersen Lutheran Medical Center, Inc CurrentSince Jun 1, 2013 Accepting new patients
Gundersen Lutheran Medical Center Inc Current Accepting new patients

Locations

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: mfisher55312@direct.emplifyhealth.org

Organizations & group practices 5

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 8

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": "1178150400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1774483200000",
    "number": "1245452549",
    "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": "1836 SOUTH AVE",
            "city": "LA CROSSE",
            "state": "WI",
            "postal_code": "546015429",
            "telephone_number": "608-782-7300"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FISHER",
        "first_name": "MASON",
        "middle_name": "GORDON",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2007-05-03",
        "last_updated": "2026-03-26",
        "certification_date": "2026-03-26",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208600000X",
            "taxonomy_group": "",
            "desc": "Surgery",
            "state": "WI",
            "license": "55044",
            "primary": false
        },
        {
            "code": "2086S0102X",
            "taxonomy_group": "",
            "desc": "Surgery, Surgical Critical Care",
            "state": "WI",
            "license": "55044",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "1245452549",
            "state": "WI"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in La Crosse, WI

Sources for this page

Verify at the official NPI Registry.