Shannon Offerman, MD

Primary specialty

Radiation Oncology PhysicianTaxonomy code 2085R0001X

License

55615-20 Issued in WI

Practice address

19333 W North Ave
Brookfield, WI 53045-4132

Phone

(262) 780-4100

NPI assigned

Oct 24, 2007

Last updated

Oct 30, 2025By the provider in NPPES

Sex

Female

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in WI

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Radiation Oncology

Education

Medical College of Wisconsin, 2006

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Radiation Oncology Associates LTDGroup PAC ID 7618924622, 23 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Ascension SE Wisconsin Hospital Hospital, Milwaukee, WI, CCN 520136
• Ascension St Francis Hospital Hospital, Milwaukee, WI, CCN 520078
• Ascension All Saints Hospital Hospital, Racine, WI, CCN 520096
• Ascension NE Wisconsin - St Elizabeth Campus Hospital, Appleton, WI, CCN 520009

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: sofferman47768@direct.myadvocateaurora.org

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.

• Radiation Oncology Associates, LTD

  • Radiation Oncology Physician
  • Milwaukee, WI
  • NPI 1932154754
  Medicare reassignment Care Compare group NPD

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

• Ascension All Saints Hospital, Inc

  dba Ascension All Saints Hospital

  • General Acute Care Hospital
  • Racine, WI
  • NPI 1639123284
  Care Compare affiliation
• Ascension NE Wisconsin, Inc

  • Ambulatory Surgical Clinic/Center
  • Menasha, WI
  • NPI 1124075536

  Hospital

  Care Compare affiliation
• Ascension NE Wisconsin, Inc

  dba Ascension NE Wisconsin-St Elizabeth Campus

  • General Acute Care Hospital
  • Appleton, WI
  • NPI 1407803638
  Care Compare affiliation
• Ascension SE Wisconsin Hospital, Inc

  dba Ascension SE Wisconsin Hospital-Elmbrook Campus

  • General Acute Care Hospital
  • Milwaukee, WI
  • NPI 1427007384
  Care Compare affiliation
• Ascension SE Wisconsin Hospital, Inc

  dba Ascension SE Wisconsin Hospital-Elmbrook Campus

  • Rehabilitation Hospital Unit
  • Brookfield, WI
  • NPI 1861417362
  Care Compare affiliation
• Ascension St Francis Hospital, Inc

  dba Ascension St Francis Hospital

  • General Acute Care Hospital
  • Milwaukee, WI
  • NPI 1225087190
  Care Compare affiliation

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

{
    "created_epoch": "1193184000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761782400000",
    "number": "1356520506",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "11516 N PORT WASHINGTON RD STE 107",
            "city": "MEQUON",
            "state": "WI",
            "postal_code": "530923478",
            "telephone_number": "262-241-5040",
            "fax_number": "262-241-5261"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "19333 W NORTH AVE",
            "city": "BROOKFIELD",
            "state": "WI",
            "postal_code": "530454132",
            "telephone_number": "262-780-4100"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "OFFERMAN",
        "first_name": "SHANNON",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2007-10-24",
        "last_updated": "2025-10-30",
        "certification_date": "2025-10-30",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "OH",
            "license": "57013998",
            "primary": false
        },
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "WI",
            "license": "55615-20",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Lori Jean Obrien, R.N.
• Occupational Health Centers of the Southwest P.a. (OHC of the Southwest, PA (MN))
• Occupational Health Centers of the Southwest, P.a. (Concentra Medical Center)
• Ocd and Anxiety Services, LLC
• Olivia Rae Oddis
• Nicole Marie Ogden
• Catherine Olaciregui, SLP
• Maria C Olafsson, LCSW
• Debbie S. Oldham, LCSW, CADC-D
• Amy Sue Olejnik, PT

• Radiation Oncology Physician in Brookfield, WI
• Providers in Brookfield, WI by specialty
• Radiation Oncology Physician in Wisconsin

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 30, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.