Marian Stefan Kosmowski, M.D.
Diagnostic Radiology Physician · Sioux City, IA
Marian Stefan Kosmowski, M.D. is a diagnostic radiology physician with a practice address in Sioux City, Iowa, and NPI 1871562280, issued on Mar 16, 2006. Check the license (Iowa 33927, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Marian Stefan Kosmowski
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License numbers
- 33927 IA
23253 NE
Self-reported in NPPES; status is on the state search - Practice location
- 801 5TH St, Sioux City, IA 51101
- Phone
- (308) 647-4900
- Enumerated
- Mar 16, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (308) 647-5378
- Medicaid IDs
- 0229278 IA
7775240 SD - Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 364 in Iowa → Look up another NPI →
Also registered at 801 5TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ahmed AbdulrahmanHospitalist Physician1972252856
- Monsurat AdelekePsychiatric/Mental Health Nurse Practitioner1669308433
- Ali Aljuhani, LMSWClinical Social Worker1366918062
- Ashley Anderson, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1881499242
- Peter Anderson, M.D.Internal Medicine Physician1114967858
- Sydney Backstrom, PHARMDPharmacist1407713357
Verify Marian Stefan Kosmowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 33927Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
55% fewer Medicare Part D claims than the average diagnostic radiology physician in 2024
23 Medicare Part D claims, against an average of 51 among the 2,711 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.
Marian Stefan Kosmowski among 364 diagnostic radiology physician records in Iowa
Marian Stefan Kosmowski, M.D. is one of 364 diagnostic radiology physician records with a practice address in Iowa. 61% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 20% of them.
- NPI issued2006 · 20% of these records are older, 53% newer
- In a Medicare fileYes · 61% of these records are
- In the CMS Doctors and Clinicians fileNo · 55% of these records are
- Record last updated2007 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in Iowa
There are 364 diagnostic radiology physician records in Iowa.
All 364 in Iowa → Every provider in Sioux City → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Jonathan Beeler, M.D.Sioux City, IA 511011265491476
- Khaled Hamada, M.D.Sioux City, IA 511011982869764
- Donald Schenk, M.D.Sioux City, IA 511011134198542
- Jon TaylorSioux City, IA 511011699734806
- Sheila Foster, D.O.Sioux City, IA 511041235456765
- James Goebel, M.D.Sioux City, IA 511041366402836
- Todd Stephens, D.O.Sioux City, IA 511041598725707
- Nicholas Devries, DOOrange City, IA 510411063482461
Common questions
What is Marian Stefan Kosmowski, M.D.'s NPI number?
Marian Stefan Kosmowski, M.D.'s National Provider Identifier (NPI) is 1871562280, issued on Mar 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marian Stefan Kosmowski, M.D. located?
The NPPES record lists a practice address at 801 5TH St, Sioux City, IA, 51101. Phone: (308) 647-4900. Providers update this record themselves, so call before visiting.
How can I verify Marian Stefan Kosmowski, M.D.'s license?
NPPES lists Iowa license number 33927, as entered by the provider. Search the Iowa Board of Medicine at https://dial.iowa.gov/about-dial/boards-and-commissions/medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Marian Stefan Kosmowski, M.D. prescribe under Medicare Part D?
In 2024, Marian Stefan Kosmowski, M.D. had 23 Medicare Part D claims; the average among diagnostic radiology physician prescribers was 51. 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.