NPIMap

Individual provider Active NPI

Gregory N Geissinger, PAC

  • Physician Assistant
  • Marshfield, WI
National Provider Identifier
1699882969
Registry record updated Nov 17, 2022
On this page

Key facts

NPPES NPI Registry
Primary specialty
Physician AssistantTaxonomy code 363A00000X
License
1225 Issued in WI
Practice address
1000 N Oak Ave
Marshfield, WI 54449
Phone
(715) 387-5297
NPI assigned
Aug 24, 2006
Last updated
Nov 17, 2022By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Nov 17, 2022

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

Specialties & licenses 1

Specialty (taxonomy)CodeLicenseStatePrimary
Physician Assistant 363A00000X 1225 WI Primary

Addresses

Primary practice location

1000 N Oak Ave
Marshfield, WI 54449

Mailing address

1000 N Oak Ave
Marshfield, WI 54449-5777

Other identifiers 1

IdentifierTypeStateIssuer
42996700MedicaidWI

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address him@marshfieldclinichealthsystem.cernerdirect.com Other

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
I20110210001156 WI Practitioner - Physician Assistant 0941480735 Reassigns benefits to 4 organizations

Care Compare profile

Medicare Care Compare
Specialty
Physician Assistant
Education
Other, 2000
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
MCHS Hospitals IncGroup PAC ID 5698071173, 1,195 clinicians
Aspirus Medical Group, Inc.Group PAC ID 1052223625, 272 clinicians

Practice addresses (Care Compare)

1000 N Oak Ave
Marshfield, WI 54449-5703
Phone (715) 387-5511

425 Pine Ridge Blvd
Suite 300
Wausau, WI 54401-4124
Phone (715) 847-2070

Hospital & facility affiliations

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

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Physician Assistant

State licenses

LicenseStateTypeSpecialty
1225WIMDPhysician Assistant

Practice roles

OrganizationSpecialtyStatusNew patients
MCHS Hospitals Inc Current Accepting new patients
Aspirus Wausau Hospital, Inc. CurrentSince Nov 1, 2025 Accepting new patients
MCHS Hospitals Inc CurrentSince Mar 1, 2018 Accepting new patients
MCHS Hospitals Inc CurrentSince Mar 1, 2018 Accepting new patients
Aspirus Medical Group, Inc. Current Accepting new patients
Aspirus Wausau Hospital, Inc CurrentSince Nov 1, 2025 Accepting new patients
Aspirus Medical Group, Inc. CurrentSince Nov 1, 2025 Accepting new patients
Aspirus Wausau Hospital, Inc. Current Accepting new patients
Aspirus Medical Group, Inc. CurrentSince Nov 1, 2025 Accepting new patients
Marshfield Clinic Inc CurrentSince Aug 21, 2000 Accepting new patients
Memorial Hospital Inc Past Accepting new patients
Aspirus Medical Group, Inc. Past Accepting new patients

Locations

29980 Network Pl
Chicago, IL 60673

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

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

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

333 Pine Ridge Blvd
Wausau, WI 54401
Phone (715) 847-2160

425 Pine Ridge Blvd
Ste 300
Wausau, WI 54401
Phone (715) 847-0402

4005 Community Center Dr
Weston, WI 54476
Phone (715) 241-5400

Interoperability endpoints

  • Direct secure messaging: gregory.geissinger@marshfieldclinichealthsystem.cernerdirect.com
  • Direct secure messaging: him@marshfieldclinichealthsystem.cernerdirect.com

Organizations & group practices 13

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.

View all 13

Hospital & facility affiliations 33

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

View all 33

NPI Registry JSON

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

{
    "created_epoch": "1156377600000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1668643200000",
    "number": "1699882969",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1000 N OAK AVE",
            "city": "MARSHFIELD",
            "state": "WI",
            "postal_code": "544495777"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 N OAK AVE",
            "city": "MARSHFIELD",
            "state": "WI",
            "postal_code": "54449",
            "telephone_number": "715-387-5297"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GEISSINGER",
        "first_name": "GREGORY",
        "middle_name": "N",
        "credential": "PAC",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-08-24",
        "last_updated": "2022-11-17",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "363A00000X",
            "taxonomy_group": "",
            "desc": "Physician Assistant",
            "state": "WI",
            "license": "1225",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "42996700",
            "state": "WI"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "him@marshfieldclinichealthsystem.cernerdirect.com",
            "affiliation": "N",
            "use": "OTHER",
            "useDescription": "Other",
            "useOtherDescription": "Other",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "Other",
            "address_1": "1000 N Oak Ave",
            "city": "Marshfield",
            "state": "WI",
            "country_code": "US",
            "postal_code": "544495703",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Marshfield, WI

Sources for this page

Verify at the official NPI Registry.