Gregory Jay Kosters, D.O.
Family Medicine Physician · Sibley, IA
Gregory Jay Kosters, D.O. is a family medicine physician with a practice address in Sibley, Iowa, and NPI 1821076886, issued on Jan 9, 2006. Check the license (Iowa 02096, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Gregory Jay Kosters
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 02096 IA
Self-reported in NPPES; status is on the state search - Practice location
- 600 9TH Ave N, Sibley, IA 51249
- Phone
- (712) 754-3658
- Enumerated
- Jan 9, 2006
- Record last updated
- Mar 7, 2023
- Fax
- (712) 754-2634
- Medicaid IDs
- 7771982 SD
2228510 IA - Medicare enrollment
- Enrolled (PECOS I20080527000523); accepts Medicare assignment
- Entity
- Type 1 · individual
Also registered at 600 9TH Ave N
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Reegan Delzer, PT, DPTPhysical Therapist1225837321
- Tasha Jennings, ARNPFamily Nurse Practitioner1689074114
- Douglas Miedema, D.O.Family Medicine Physician1720080237
- Nathan Peters, ARNPFamily Nurse Practitioner1699366617
- Abby Petersen, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1831816909
- Christian Sessa, D.O.Family Medicine Physician1730123332
Verify Gregory Jay Kosters in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 02096Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.0 times the Medicare Part D claims of the average family medicine physician in 2024
10,483 Medicare Part D claims for 446 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 186 claims were for opioids.
Most prescribed
- Levothyroxine Sodium633 claims
- Rosuvastatin Calcium573 claims
- Losartan Potassium424 claims
- Omeprazole352 claims
- Atorvastatin Calcium314 claims
- Furosemide302 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.
Industry payments in 2024: $349.83
20 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Avera MckennanSpencer, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
5 family medicine physician records list a practice address in Sibley
They are 5 of the 22 NPPES records with a practice address in Sibley, and 2,336 family medicine physician records in Iowa.
All 5 in Sibley → All 2,336 in Iowa → Every provider in Sibley →
Other family medicine physician records in Iowa
- Jennifer Aanestad, M.D.Durant, IA1386649341
- Amjad Abdelhady, MDSioux City, IA1033966700
- Afsana Abdullah, D.O.Bettendorf, IA1760583066
- Raja Ali Abdullah, MDCedar Falls, IA1356101000
- Laura Abels, DOAnkeny, IA1427313527
- Matthew AbendrothDes Moines, IA1972918894
- Mabra Abernathy, M.D.Coralville, IA1316922545
- Jennifer Abler, D.O.Altoona, IA1528159068
- Michael Abouassaly, M.D.West Burlington, IA1184790909
- Safa Abukhalil, M.B.B.SWest Des Moines, IA1982084463
Common questions
What is Gregory Jay Kosters, D.O.'s NPI number?
Gregory Jay Kosters, D.O.'s National Provider Identifier (NPI) is 1821076886, issued on Jan 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Jay Kosters, D.O. located?
The NPPES record lists a practice address at 600 9TH Ave N, Sibley, IA, 51249. Phone: (712) 754-3658. Providers update this record themselves, so call before visiting.
How can I verify Gregory Jay Kosters, D.O.'s license?
NPPES lists Iowa license number 02096, 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 Gregory Jay Kosters, D.O. prescribe under Medicare Part D?
In 2024, Gregory Jay Kosters, D.O. had 10,483 Medicare Part D claims for 446 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.