Jeffrey D. Tiemstra, M.D.
Family Medicine Physician · Elkhorn, WI
Jeffrey D. Tiemstra, M.D. is a family medicine physician with a practice address in Elkhorn, Wisconsin, and NPI 1336252238, issued on Aug 16, 2006. Check the license (Wisconsin 64749, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Jeffrey D. Tiemstra
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 64749 WI
Self-reported in NPPES; status is on the state search - Practice location
- W3985 County Road NN, Elkhorn, WI 53121
- Phone
- (262) 741-2000
- Enumerated
- Aug 16, 2006
- Record last updated
- Aug 7, 2023
- Medicaid ID
- 100049570 WI
- Medicare enrollment
- Enrolled (PECOS I20151117002114); accepts Medicare assignment
- Medical or professional school
- Rush Medical College Of Rush University, 1984
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at W3985 County Road NN
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jeffrey D. Tiemstra in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 64749Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% fewer Medicare Part D claims than the average family medicine physician in 2024
2,313 Medicare Part D claims for 223 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims. 20 claims were for opioids.
Most prescribed
- Atorvastatin Calcium122 claims
- Levothyroxine Sodium98 claims
- Gabapentin91 claims
- Amlodipine Besylate79 claims
- Metformin Hcl79 claims
- Losartan Potassium74 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
- Aurora Medical Group, Inc.Elkhorn, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jeffrey D. Tiemstra among 3,765 family medicine physician records in Wisconsin
Jeffrey D. Tiemstra, M.D. is one of 3,765 family medicine physician records with a practice address in Wisconsin. 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 10% of them.
- NPI issued2006 · 10% of these records are older, 46% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1984 · median 2007 among the 2,347 with a school on file
- Record last updated2023 · 56% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 family medicine physician records list a practice address in Elkhorn
They are 19 of the 372 NPPES records with a practice address in Elkhorn, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Elkhorn → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Ryan Brower, M.D.Elkhorn, WI 531211497102347
- Edward Carlson, MDElkhorn, WI 531211114036738
- Jessica Furey, DOElkhorn, WI 531211811334501
- Bridget Kampman, M.DElkhorn, WI 531211922237023
- Jeffrey Kowalski, MDElkhorn, WI 531211811169550
- Rabeea Lodhra, MDElkhorn, WI 531211548898059
- Kamal Muzaffar, MDElkhorn, WI 531211174599500
- Roger Petersen, M.D.Elkhorn, WI 531211871853846
Common questions
What is Jeffrey D. Tiemstra, M.D.'s NPI number?
Jeffrey D. Tiemstra, M.D.'s National Provider Identifier (NPI) is 1336252238, issued on Aug 16, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jeffrey D. Tiemstra, M.D. located?
The NPPES record lists a practice address at W3985 County Road NN, Elkhorn, WI, 53121. Phone: (262) 741-2000. Providers update this record themselves, so call before visiting.
How can I verify Jeffrey D. Tiemstra, M.D.'s license?
NPPES lists Wisconsin license number 64749, 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 Jeffrey D. Tiemstra, M.D. prescribe under Medicare Part D?
In 2024, Jeffrey D. Tiemstra, M.D. had 2,313 Medicare Part D claims for 223 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.