Daniel S. Wientzen, DO
Family Medicine Physician · Decorah, IA
Daniel S. Wientzen, DO is a family medicine physician with a practice address in Decorah, Iowa, and NPI 1952417248, issued on Aug 21, 2006. Check the license (Iowa 3864, as entered in NPPES) on the Iowa Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Daniel S. Wientzen
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 3864 IA
DO-R-8208 IA
Self-reported in NPPES; status is on the state search - Practice location
- 1830 State Highway 9, Decorah, IA 52101
- Phone
- (563) 382-3140
- Enumerated
- Aug 21, 2006
- Record last updated
- Nov 18, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20080222000585); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 2,336 in Iowa → Look up another NPI →
Also registered at 1830 State Highway 9
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Janna Edrington, RNC ARNPWomen's Health Nurse Practitioner1770563546
Verify Daniel S. Wientzen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIowa Board of Medicine
Search for license 3864Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average family medicine physician in 2024
9,253 Medicare Part D claims for 484 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 188 claims were for opioids.
Most prescribed
- Atorvastatin Calcium633 claims
- Omeprazole326 claims
- Amlodipine Besylate292 claims
- Levothyroxine Sodium288 claims
- Losartan Potassium278 claims
- Metoprolol Succinate269 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 2 group practices
- Gundersen Clinic LtdDecorah, IA
- Gundersen Regional Clinics, LLCDecorah, IA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Daniel S. Wientzen among 2,336 family medicine physician records in Iowa
Daniel S. Wientzen, DO is one of 2,336 family medicine physician records with a practice address in Iowa. 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 16% of them.
- NPI issued2006 · 16% of these records are older, 48% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated2006 · median 2006 among the 1,367 with a school on file
- Record last updated2015 · 61% 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 Iowa practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
25 family medicine physician records list a practice address in Decorah
They are 25 of the 282 NPPES records with a practice address in Decorah, and 2,336 family medicine physician records in Iowa.
All 2,336 in Iowa → Every provider in Decorah → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Anthony Coppola, DODecorah, IA 521011467568766
- Tedd Gentry, M.D.Decorah, IA 521011902804529
- Andy Goodner, MDDecorah, IA 521011548214190
- Kevin Locke, M.D.Decorah, IA 521011427052877
- James Ott, M.D.Decorah, IA 521011871572057
- Paul Pellett, MDDecorah, IA 521011689676926
- Max Quaas, M.D.Decorah, IA 521011649237298
- Janet Ryan, MDDecorah, IA 521011972507895
Common questions
What is Daniel S. Wientzen, DO's NPI number?
Daniel S. Wientzen, DO's National Provider Identifier (NPI) is 1952417248, issued on Aug 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Daniel S. Wientzen, DO located?
The NPPES record lists a practice address at 1830 State Highway 9, Decorah, IA, 52101. Phone: (563) 382-3140. Providers update this record themselves, so call before visiting.
How can I verify Daniel S. Wientzen, DO's license?
NPPES lists Iowa license number 3864, 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 Daniel S. Wientzen, DO prescribe under Medicare Part D?
In 2024, Daniel S. Wientzen, DO had 9,253 Medicare Part D claims for 484 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.