Jeffrey Tiemstra, M.D.
NPI 1336252238 · Family Medicine Physician · Elkhorn, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Jeffrey Tiemstra, M.D. is a Family Medicine Physician provider in Elkhorn, WI (NPI 1336252238).
Provider details
- NPI number
- 1336252238
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 64749 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
259 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 70 | $119 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 50 | $8 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 49 | $85 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 49 | $15 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 22 | $116 |
| Hemoglobin A1c Level, By Device for Home Use |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 54 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 122 | 38 |
| Levothyroxine Sodium | 98 | 21 |
| Gabapentin | 91 | 24 |
| Amlodipine Besylate | 79 | 29 |
| Metformin Hcl | 79 | 22 |
| Losartan Potassium | 74 | 22 |
| Lisinopril |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-16
- Last updated
- 2023-08-07
- Certified
- 2023-08-07
Frequently asked questions
- What is Jeffrey Tiemstra's NPI number?
- Jeffrey Tiemstra's National Provider Identifier (NPI) is 1336252238, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Jeffrey Tiemstra's specialty?
- Jeffrey Tiemstra is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Jeffrey Tiemstra located?
- Jeffrey Tiemstra's practice location on file with NPPES is W3985 County Road Nn, Elkhorn, WI 53121-4337.
- What is Jeffrey Tiemstra's phone number?
- The practice phone number listed in the NPPES registry for Jeffrey Tiemstra is (262) 741-2000.
- Does Jeffrey Tiemstra accept Medicare?
- Jeffrey Tiemstra is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Jeffrey Tiemstra's NPI active?
- Yes — Jeffrey Tiemstra's NPI (1336252238) is active in the NPPES registry as of the last update on 2023-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.