John A. Kosiak, MN
Radiation Oncology Physician · Coon Rapids, MN
John A. Kosiak, MN is a radiation oncology physician with a practice address in Coon Rapids, Minnesota, and NPI 1033101886, issued on Aug 18, 2005. Check the license (Minnesota 27894, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- John A. Kosiak
- Credential
- MN
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License number
- 27894 MN
Self-reported in NPPES; status is on the state search - Practice location
- 11850 Blackfoot St NW Ste 150, Coon Rapids, MN 55433
- Phone
- (763) 433-0221
- Enumerated
- Aug 18, 2005
- Record last updated
- Nov 28, 2023
- Fax
- (763) 433-0235
- Medicaid IDs
- 30572500 WI
856370500 MN - Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 160 in Minnesota → Look up another NPI →
Also registered at 11850 Blackfoot St NW Ste 150
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Duncan Dickson, MDRadiation Oncology Physician1508858309
- Robert Gao, MDRadiation Oncology Physician1245893122
Verify John A. Kosiak in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 27894Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
88% fewer Medicare Part D claims than the average radiation oncology physician in 2024
16 Medicare Part D claims, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
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.
John A. Kosiak among 160 radiation oncology physician records in Minnesota
John A. Kosiak, MN is one of 160 radiation oncology physician records with a practice address in Minnesota. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 84% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2023 · 39% 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 Minnesota 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 Minnesota
There are 160 radiation oncology physician records in Minnesota.
All 160 in Minnesota → Every provider in Coon Rapids → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Duncan Dickson, MDCoon Rapids, MN 554331508858309
- Robert Gao, MDCoon Rapids, MN 554331245893122
- Jenna BorkenhagenFridley, MN 554321114345279
- Jeffrey Herman, MDFridley, MN 554321689666497
- Douglas Olson, MDEdina, MN 554341740272210
- Richard Diaz, MDEdina, MN 554351831190412
- Hunter Gits, MDEdina, MN 554351578069464
- Gregory Meyers, M.D.Edina, MN 554351295759009
Common questions
What is John A. Kosiak, MN's NPI number?
John A. Kosiak, MN's National Provider Identifier (NPI) is 1033101886, issued on Aug 18, 2005. An NPI identifies a provider in billing; it is not a license.
Where is John A. Kosiak, MN located?
The NPPES record lists a practice address at 11850 Blackfoot St NW Ste 150, Coon Rapids, MN, 55433. Phone: (763) 433-0221. Providers update this record themselves, so call before visiting.
How can I verify John A. Kosiak, MN's license?
NPPES lists Minnesota license number 27894, as entered by the provider. Search the Minnesota Board of Medical Practice at https://mn.gov/boards/medical-practice/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John A. Kosiak, MN prescribe under Medicare Part D?
In 2024, John A. Kosiak, MN had 16 Medicare Part D claims; 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.