Dr. Shannon T. Offerman, MD
- Medicare services, 2024
- 730
- Medicare patients, 2024
- 161
- Part D claims, 2024
- 368
- Publications
- 1
- Clinical trials
- 9
- Practice address
- 11516 N Port Washington Rd, Mequon, WI 53092
- Practice phone
- Call (414) 649-6420
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Radiation Oncology Associates, Ltd
Mequon, Wisconsin
Find Dr. Offerman's professional email, personal email and mobile number
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Dr. Shannon T. Offerman is a radiation oncologist in Mequon, Wisconsin
Dr. Offerman practices at Radiation Oncology Associates, Ltd in Mequon, Wisconsin.
Dr. Offerman's NPI, 1356520506, was assigned on October 24, 2007. Dr. Offerman graduated from Medical College of Wisconsin in 2006. Dr. Offerman holds Wisconsin license 55615-20.
- NPI
- 1356520506NPI Registry (opens in a new tab)
- Medicare PAC ID
- 9537337498
- NPI enumeration date
- October 24, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (414) 649-6420
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 46
- Medical school graduation
- 2006
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Shannon T. Offerman practices at Radiation Oncology Associates, Ltd in Mequon, Wisconsin
Dr. Offerman's primary practice is Radiation Oncology Associates, Ltd, at 11516 N Port Washington Rd, Mequon, WI 53092 in Ozaukee County. The practice phone is (414) 649-6420.
- Radiation Oncology Associates, Ltd11516 N Port Washington Rd, Mequon, WI 53092 · Ozaukee CountyPhone(414) 649-6420
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Shannon T. Offerman is affiliated with 5 sites of care and 1 medical group
Dr. Offerman's primary practice is Radiation Oncology Associates, Ltd in Mequon, Wisconsin. Dr. Offerman is also affiliated with Ascension SE Wisconsin Hospital - St. Joseph. The medical group on file is Radiation Oncology Associates, Ltd. Dmand AI also links Dr. Offerman to 3 more hospitals, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Shannon T. Offerman's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Offerman practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Radiation Oncology Associates, Ltd | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Shannon T. Offerman is one of 121 radiation oncologists in Wisconsin
Radiation oncology is Dr. Offerman's primary specialty in the NPI Registry, under taxonomy code 2085R0001X. Dmand AI has Dr. Offerman's licenses on file in 2 states: Wisconsin and Ohio.
Specialties and state licenses
- Radiation oncology, WisconsinPrimary
- Ohio license
Radiation oncologists near Dr. Offerman
Counts of radiation oncologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Shannon T. Offerman billed Medicare for 730 services in 2024
CMS data shows 730 Medicare services from Dr. Offerman across 12 procedure codes in 2024, for 161 Medicare patients. Medicare paid $50,197 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Offerman's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 6302024: 628No change
- Office and hospital visits
- 2023: 992024: 8118%
- Other services
- 2023: 02024: 21
Dr. Offerman compared with the Wisconsin median for radiation oncologists, 2024
- Dr. Offerman
- Wisconsin median
- Medicare services
- 730vs 88918% below
- Medicare patients
- 161vs 1489% above
- Part D claims
- 251vs 416.1 times
Medians across 125 radiation oncologists in Wisconsin with Dmand AI profiles that report each measure.
Dr. Offerman's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Shannon T. Offerman treated 161 Medicare patients in 2024, average age 75
CMS counts 161 Medicare patients who saw Dr. Offerman in 2024. The largest group is 65 to 74, with 81 patients. 75% of them have cancer, and 72% have high blood pressure. 8% are also on Medicaid. Their average risk score is 1.32, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Offerman's median patient age at 70, with 42% women.
Dr. Offerman's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Offerman's Medicare patients by sex, 2024
- Women5735%
- Men10465%
Chronic conditions among Dr. Offerman's Medicare patients, 2024
- Cancer75%
- High blood pressure72%
- High cholesterol70%
- Arthritis39%
- Ischemic heart disease27%
- Diabetes24%
- Chronic kidney disease22%
- COPD21%
Share of Medicare patients with each condition. A patient can have several.
Dr. Offerman's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 70
Patient panel by sex, all payers
- Women42%
- Men57%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Shannon T. Offerman wrote 368 Medicare Part D claims in 2024
In 2024, Dr. Offerman wrote 368 Medicare Part D claims for 112 patients. 94% of them were for generic drugs. CMS names the drug for 251 of them, across 7 drugs with 11 or more claims each, at $13,643 in total drug cost. In 2023, CMS named 208 claims across 5 drugs.
Dr. Offerman's Part D claims by kind of drug, 2024
- Generic345 claims94%
- Brand-name23 claims6%
Dr. Offerman's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Offerman's Part D claims, 2024
- Opioids4%15 of 368 claims
- Antibiotics3%11 of 368 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2082024: 25121%
Drugs named by CMS: 7 in 2024, 5 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Shannon T. Offerman takes part in Medicare
Dr. Offerman accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Shannon T. Offerman has 1 publication on record
Dmand AI links 1 paper to Dr. Offerman in 2022. Dr. Offerman's most frequent co-authors are Krisha J. Howell, MD, Lindsay L. Puckett, MD and Hina Saeed.
Dr. Offerman's most frequent co-authors
Recent publications by Dr. Offerman
See who Dr. Offerman researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Offerman works with, so you can find a warm path to the right radiation oncologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Shannon T. Offerman has worked on 9 clinical trials
Dmand AI links Dr. Offerman to 9 clinical trials, 6 of them phase 3 studies. 8 are still active or recruiting. Conditions studied include Brain Neoplasms, Carcinoma, Lobular and Carcinosarcoma. Alliance for Clinical Trials in Oncology sponsors the most, 3.
Clinical trials with Dr. Offerman by phase
- NonePhase 1: no trials
- NonePhase 2: no trials
- 2Phase 2/3: 2 trials
- 6Phase 3: 6 trials
- NonePhase 4: no trials
Trials with no phase (devices, behavioral studies) are left out.
Conditions in Dr. Offerman's trials
- Brain Neoplasms
- Carcinoma, Lobular
- Carcinosarcoma
- Lung Neoplasms
- Oropharyngeal Neoplasms
Investigators on the most trials with Dr. Offerman
- James H. Taylor, MD5 shared trials
- Desiree Elaine Doncals, MD4 shared trials
- Richard S. Hudes, MD4 shared trials
Recent clinical trials with Dr. Offerman
Phase III Trial of Post-Surgical Single Fraction Stereotactic Radiosurgery (SRS) Compared with Fractionated SRS for Resected Metastatic Brain Disease (opens in a new tab)
Testing the Addition of the Immunotherapy Drug, Pembrolizumab, to the Usual Radiation Treatment for Newly Diagnosed Early Stage High Intermediate Risk Endometrial Cancer (opens in a new tab)
De-intensified Radiation Therapy With Chemotherapy (Cisplatin) or Immunotherapy (Nivolumab) in Treating Patients With Early-Stage, HPV-Positive, Non-Smoking Associated Oropharyngeal Cancer (opens in a new tab)
Hypofractionated Radiation Therapy After Mastectomy in Preventing Recurrence in Patients with Stage IIa-IIIa Breast Cancer (opens in a new tab)
Sources: Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Shannon T. Offerman received $494 in industry payments from 2016 to 2025
CMS Open Payments shows 19 general payments to Dr. Offerman from 13 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 96% of the total. Elekta, Inc. paid the most, $137.
General payments to Dr. Offerman by program year, 2016 to 2025
General payments to Dr. Offerman by kind, 2016 to 2025
- Food and beverage$47696%
- Education$194%
Companies that paid Dr. Offerman the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Shannon T. Offerman graduated from Medical College of Wisconsin
Dr. Offerman graduated from Medical College of Wisconsin in 2006.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Shannon T. Offerman's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Shannon T. Offerman
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What is Dr. Shannon T. Offerman's NPI number?
Dr. Shannon T. Offerman's NPI number is 1356520506. It was assigned on October 24, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Shannon T. Offerman?
Dr. Shannon T. Offerman is a radiation oncologist in Mequon, Wisconsin. The primary specialty in the NPI Registry is Radiation Oncology Physician (taxonomy code 2085R0001X).
Where does Dr. Shannon T. Offerman practice?
Dr. Offerman practices at 11516 N Port Washington Rd, Mequon, WI 53092. Dr. Offerman's primary practice is Radiation Oncology Associates, Ltd in Mequon, Wisconsin. Dmand AI also links Dr. Offerman to 3 hospitals.
What is Dr. Shannon T. Offerman's office phone number?
The practice phone on file for Dr. Offerman is (414) 649-6420.
What is Dr. Shannon T. Offerman's medical license number?
Dr. Offerman holds Wisconsin license 55615-20, one of the licenses on file in 2 states.
Which states has Dr. Shannon T. Offerman been licensed in?
Dmand AI has state licenses on file for Dr. Offerman in Wisconsin and Ohio.
Which hospitals is Dr. Shannon T. Offerman affiliated with?
Dr. Offerman is affiliated with Ascension SE Wisconsin Hospital - St. Joseph. Dmand AI links Dr. Offerman to 3 more hospitals.
What medical group is Dr. Shannon T. Offerman part of?
Dr. Offerman is linked to Radiation Oncology Associates, Ltd.
Does Dr. Shannon T. Offerman accept Medicare?
Yes. CMS data shows Dr. Offerman billed Medicare for 730 services in 2024, and Dr. Offerman accepts Medicare assignment.
How many Medicare patients does Dr. Shannon T. Offerman see?
CMS counts 161 Medicare patients who saw Dr. Offerman in 2024, with an average age of 75.
Show 7 more questionsShow fewer questions
What services does Dr. Shannon T. Offerman bill to Medicare?
In 2024, Dr. Offerman's most billed Medicare services were radiation oncology (77014), radiation oncology (77300) and radiation oncology (77427).
Where did Dr. Shannon T. Offerman go to medical school?
Dr. Offerman graduated from Medical College of Wisconsin in 2006.
What drugs does Dr. Shannon T. Offerman prescribe most?
In 2024 Medicare Part D data, Dr. Offerman's most prescribed drugs by claims were Tamsulosin HCl, Megestrol Acetate and Oxybutynin Chloride ER.
Has Dr. Shannon T. Offerman received payments from drug or device companies?
CMS Open Payments shows $494 in general payments to Dr. Offerman from 13 companies from 2016 to 2025. The largest total came from Elekta, Inc.
How long has Dr. Shannon T. Offerman been practicing?
Dr. Offerman graduated from medical school in 2006, 20 years ago.
Does Dr. Shannon T. Offerman do research?
Dmand AI links 1 publication to Dr. Offerman. Dr. Offerman has worked on 9 clinical trials.
Who does Dr. Shannon T. Offerman publish with?
Dr. Offerman's most frequent co-authors are Krisha J. Howell, MD (1 shared paper), Lindsay L. Puckett, MD (1 shared paper) and Hina Saeed (1 shared paper).
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