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

Derek T Tessman, DO

Individual provider Trauma Surgery Physician · NPI 1275023988

Derek T Tessman, DO practises General Surgery in Madison, Wisconsin. Graduated from Des Moines University of Osteopathic Medicine and Health Sciences in 2018, 8 years ago. Practices with Dean Health Systems Inc, a 1,184-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
8
Trained at
Des Moines University of Osteopathic Medicine and Health Sciences
Licensed in
WI
In the registry since
2018
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

700 S Park St
Madison, WI 53715-1830
Phone: (608) 251-6100
Fax: (608) 260-2976
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Trauma Surgery Physician (primary) Taxonomy 2086S0127X · Licence 81525-21 (WI)

Record details

NPI number1275023988
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedMay 17, 2018
Last updated in NPPESAugust 29, 2024
Certification dateAugust 29, 2024

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Medical schoolDES MOINES UNIVERSITY OF OSTEOPATHIC MEDICINE AND HEALTH SCIENCES
Graduated 2018 (8 years in practice)
Group practice Dean Health Systems Inc — 1184 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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.

Colonoscopy 1–10 times
Hernia repair - groin (open) 1–10 times
Removal of tissue 1–10 times
Upper gastrointestinal (GI) endoscopy for acid reflux 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 patients68
Services billed 111 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

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.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Education $2,500 1 payment · educational material or training, not a fee
Food and Beverage $27 1 payment · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

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

  • Columbus Community Hospital Hospital · Columbus, WI · listed as Columbus Community Hospital Inc
  • The Monroe Clinic Hospital · Monroe, WI · listed as The Monroe Clinic, Inc
  • Aspirus Divine Savior Hospital Hospital · Portage, WI
  • Ssm Health St Clare Hospital - Baraboo Hospital · Baraboo, WI
  • Ssm Health St Mary'S Hospital - Madison Hospital · Madison, WI

Colleagues at Dean Health Systems Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1184 clinicians in the practice; 12 are shown here.

Other providers in Madison