John Martin Floberg, M.D., PH.D.
Radiation Oncology Physician · Madison, WI
John Martin Floberg, M.D., PH.D. is a radiation oncology physician with a practice address in Madison, Wisconsin, and NPI 1225456981, issued on Mar 31, 2014. Check the license (Wisconsin 71062-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John Martin Floberg
- Credential
- M.D., PH.D.
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- 71062-20 WI
2015013465 MO
Self-reported in NPPES; status is on the state search - Practice location
- 2140, Med 4 Mailbox, Hslc, Madison, WI 53705
- Phone
- (608) 263-8500
- Enumerated
- Mar 31, 2014
- Record last updated
- Jan 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20190718001236); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 2014
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 153 in Wisconsin → Look up another NPI →
Verify John Martin Floberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 71062-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.5 times the Medicare Part D claims of the average radiation oncology physician in 2024
473 Medicare Part D claims for 156 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 15 claims were for opioids.
Most prescribed
- Tamsulosin Hcl180 claims
- Ciprofloxacin Hcl73 claims
- Orgovyx63 claims
- Bicalutamide45 claims
- Oxybutynin Chloride Er17 claims
- Lorazepam14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- University OF Wisconsin Medical Foundation IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Martin Floberg among 153 radiation oncology physician records in Wisconsin
John Martin Floberg, M.D., PH.D. is one of 153 radiation oncology physician records with a practice address in Wisconsin. 88% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 25% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated2014 · median 2008 among the 119 with a school on file
- Record last updated2021 · 44% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Radiation Oncology Physician providers in Wisconsin
There are 153 radiation oncology physician records in Wisconsin.
All 153 in Wisconsin → Every provider in Madison → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Scot Callahan, MD, PHDMadison, WI 537051700527959
- Bradley Eckelmann, MD, PHDMadison, WI 537051033799531
- Steven Howard, MD PHDMadison, WI 537051124081740
- Randall Kimple, M.D. PH.D.Madison, WI 537051326253998
- Sangjune Lee, MDMadison, WI 537051922652510
- Peter Mahler, MD PHDMadison, WI 537051730142258
- Matthew Witek, MDMadison, WI 537031154651727
- Richard Auchter, MDMadison, WI 537131366404329
Common questions
What is John Martin Floberg, M.D., PH.D.'s NPI number?
John Martin Floberg, M.D., PH.D.'s National Provider Identifier (NPI) is 1225456981, issued on Mar 31, 2014. An NPI identifies a provider in billing; it is not a license.
Where is John Martin Floberg, M.D., PH.D. located?
The NPPES record lists a practice address at 2140, Med 4 Mailbox, Hslc, Madison, WI, 53705. Phone: (608) 263-8500. Providers update this record themselves, so call before visiting.
How can I verify John Martin Floberg, M.D., PH.D.'s license?
NPPES lists Wisconsin license number 71062-20, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John Martin Floberg, M.D., PH.D. prescribe under Medicare Part D?
In 2024, John Martin Floberg, M.D., PH.D. had 473 Medicare Part D claims for 156 beneficiaries; the average among radiation oncology physician prescribers was 134. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.