Harold R. Oster, MD
Internal Medicine Physician · Plymouth, MN
Harold R. Oster, MD is an internal medicine physician with a practice address in Plymouth, Minnesota, and NPI 1417915695, issued on May 3, 2006. Check the license (Minnesota 46603, as entered in NPPES) on the Minnesota Board of Medical Practice; the Medicare figures below come from public CMS files.
- Name
- Harold R. Oster
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 46603 MN
Self-reported in NPPES; status is on the state search - Practice location
- 2855 Campus Dr, Plymouth, MN 55441
- Phone
- (763) 577-7400
- Enumerated
- May 3, 2006
- Record last updated
- Mar 11, 2021 (not updated in 5 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,632 in Minnesota → Look up another NPI →
Also registered at 2855 Campus Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Harold R. Oster in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMinnesota Board of Medical Practice
Search for license 46603Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,678 Medicare Part D claims for 520 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Atorvastatin Calcium250 claims
- Amlodipine Besylate160 claims
- Lisinopril111 claims
- Rosuvastatin Calcium109 claims
- Losartan Potassium103 claims
- Metoprolol Succinate100 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.
Harold R. Oster among 2,632 internal medicine physician records in Minnesota
Harold R. Oster, MD is one of 2,632 internal medicine physician records with a practice address in Minnesota. 75% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 58% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 65% of these records are
- Record last updated2021 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Minnesota practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 internal medicine physician records list a practice address in Plymouth
They are 19 of the 1,500 NPPES records with a practice address in Plymouth, and 2,632 internal medicine physician records in Minnesota.
All 2,632 in Minnesota → Every provider in Plymouth → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alfred Chiang, D.O.Plymouth, MN 554411043243827
- Scott Flaata, DOPlymouth, MN 554411801962931
- Michael Grouws, M.D.Plymouth, MN 554411114014560
- Syed Hasan, MDPlymouth, MN 554411841492188
- Erick Huang, D.O.Plymouth, MN 554411134388218
- Ronald Kaufman, M.D., PH.D.Plymouth, MN 554411295734374
- Robert Lager, M.D.Plymouth, MN 554411962599480
- Brian Miller, MDPlymouth, MN 554411427215433
Common questions
What is Harold R. Oster, MD's NPI number?
Harold R. Oster, MD's National Provider Identifier (NPI) is 1417915695, issued on May 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Harold R. Oster, MD located?
The NPPES record lists a practice address at 2855 Campus Dr, Plymouth, MN, 55441. Phone: (763) 577-7400. Providers update this record themselves, so call before visiting.
How can I verify Harold R. Oster, MD's license?
NPPES lists Minnesota license number 46603, 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 Harold R. Oster, MD prescribe under Medicare Part D?
In 2024, Harold R. Oster, MD had 2,678 Medicare Part D claims for 520 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.