Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Daniel S Wientzen, DO

Individual provider Family Medicine Physician · NPI 1952417248

Daniel S Wientzen, DO is registered under Family Practice in Decorah, Iowa. Qualified in 2006, 20 years ago. Practices with Gundersen Clinic Ltd, a 427-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Iowa.

Years since qualifying
20
Licensed in
IA
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

1830 State Highway 9
Decorah, IA 52101-7301 Not confirmed with CMS for 10 years — call before visiting
Phone: (563) 382-3140
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 3864 (IA)
Family Medicine Physician Taxonomy 207Q00000X · Licence DO-R-8208 (IA)

Record details

NPI number1952417248
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedAugust 21, 2006
Last updated in NPPESNovember 18, 2015

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Also practisesEMERGENCY MEDICINE
Medical schoolOTHER
Graduated 2006 (20 years in practice)
Group practice Gundersen Clinic Ltd — 427 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 74 times · 74th percentile
Removal or shaving of skin growth 1–10 times
Skin biopsy 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients552
Services billed 9,628 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Gundersen Clinic Ltd

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 427 clinicians in the practice; 12 are shown here.

Other providers in Decorah