NPIMap

Individual provider Active NPI

Darren M Heesacker, MD

  • Emergency Medicine Physician
  • Oshkosh, WI
National Provider Identifier
1013953561
Registry record updated Apr 21, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Emergency Medicine PhysicianTaxonomy code 207P00000X
License
36486 Issued in WI
Practice address
855 N Westhaven Dr
Oshkosh, WI 54904-7668
Phone
(920) 288-4060
Fax
(920) 456-7421
NPI assigned
Jun 22, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Apr 21, 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 36486 WI Primary

Addresses

Primary practice location

855 N Westhaven Dr
Oshkosh, WI 54904-7668

Mailing address

1035 Kepler Dr
Green Bay, WI 54311-8320
Phone (920) 490-9046

Other identifiers 3

IdentifierTypeStateIssuer
104470702MedicaidMI
32114000MedicaidWI
930070501OtherWIRAILROAD

Electronic endpoints 1

TypeEndpointUseAffiliation
Direct Messaging Address dheesacker41084@direct.aurora.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
I20041122000946 WI Practitioner - Emergency Medicine 7214849405 Reassigns benefits to 6 organizations

Care Compare profile

Medicare Care Compare
Specialty
Emergency Medicine
Education
Medical College of Wisconsin, 1992
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Baycare Aurora LLCGroup PAC ID 0244130557, 197 clinicians
Aurora Medical Group, Inc.Group PAC ID 6709794258, 3,764 clinicians
Baycare Clinic LLPGroup PAC ID 4385554328, 197 clinicians

Practice addresses (Care Compare)

1500 Arbor Way
Kaukauna, WI 54130-7305
Phone (920) 766-3200

2253 W Mason St
Green Bay, WI 54303-4706
Phone (920) 327-7246

2845 Greenbrier Rd
Green Bay, WI 54311-6519
Phone (920) 288-4930

Hospital & facility affiliations

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
36486WIMDEmergency Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Aurora Health Care Central, Inc. Emergency Medicine CurrentSince Feb 15, 2005 Accepting new patients
Aurora Medical Group, Inc. CurrentSince Jul 13, 2020 Accepting new patients
Aurora Medical Group, Inc. Current Accepting new patients
Baycare Aurora, LLC CurrentSince Nov 4, 2002 Accepting new patients
Baycare Clinic LLP Emergency Medicine CurrentSince Feb 1, 1999 Accepting new patients
Aurora Health Care Central, Inc. CurrentSince Feb 15, 2005 Accepting new patients
Aurora Medical Group, Inc. CurrentSince Jul 13, 2020 Accepting new patients
Aurora Health Care North, Inc. CurrentSince Jun 1, 2013 Accepting new patients
Aurora Medical Center of Oshkosh, Inc Emergency Medicine CurrentSince Nov 1, 2014 Accepting new patients
Baycare Clinic LLP CurrentSince Feb 1, 1999 Accepting new patients
Great Lakes Pathologists SC Current Accepting new patients

Locations

2581 Development Dr
Green Bay, WI 54311
Phone (920) 347-0400

1035 Kepler Dr
Green Bay, WI 54311

164 N Broadway
Green Bay, WI 54303
Phone (920) 965-4055

2845 Greenbrier Rd
Green Bay, WI 54311
Phone (920) 288-3388

2253 W Mason St
Green Bay, WI 54303
Phone (920) 327-7000

2733 S Ridge Rd
Green Bay, WI 54304
Phone (920) 497-6200

1500 Arbor Way
Kaukauna, WI 54130
Phone (877) 229-2273

1020 N 12th St
Milwaukee, WI 53233
Phone (414) 219-3056

855 N Westhaven Dr
Oshkosh, WI 54904
Phone (920) 451-5643

901 Reed St
Plymouth, WI 53073
Phone (920) 451-5579

5000 Memorial Dr
Two Rivers, WI 54241
Phone (920) 794-5000

Organizations & group practices 11

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 6

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": "1150934400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1776729600000",
    "number": "1013953561",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1035 KEPLER DR",
            "city": "GREEN BAY",
            "state": "WI",
            "postal_code": "543118320",
            "telephone_number": "920-490-9046",
            "fax_number": "920-405-8005"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "855 N WESTHAVEN DR",
            "city": "OSHKOSH",
            "state": "WI",
            "postal_code": "549047668",
            "telephone_number": "920-288-4060",
            "fax_number": "920-456-7421"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HEESACKER",
        "first_name": "DARREN",
        "middle_name": "M",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-06-22",
        "last_updated": "2026-04-21",
        "certification_date": "2026-04-21",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207P00000X",
            "taxonomy_group": "",
            "desc": "Emergency Medicine",
            "state": "WI",
            "license": "36486",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "104470702",
            "state": "MI"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "32114000",
            "state": "WI"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "RAILROAD",
            "identifier": "930070501",
            "state": "WI"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "dheesacker41084@direct.aurora.org",
            "affiliation": "N",
            "address_1": "2845 Greenbrier Rd",
            "city": "Green Bay",
            "state": "WI",
            "country_code": "US",
            "postal_code": "543116519",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

Other providers in Oshkosh, WI

Sources for this page

Verify at the official NPI Registry.