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

Patrick James Brennan, MD

Individual provider Surgery Physician · NPI 1104876945

Patrick James Brennan, MD practises General Surgery in Neenah, Wisconsin. Graduated from University of Wisconsin School of Medicine in 1997, 29 years ago. Practices with Surgical Associates of Neenah, SC, a 29-clinician group and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
29
Trained at
University of Wisconsin School of Medicine
Licensed in
WI
In the registry since
2006
Specialties on file
5
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

100 Theda Clark Medical Plz Ste 400
Neenah, WI 54956-2763 Not confirmed with CMS for 18 years — call before visiting
Phone: (920) 725-4527
Fax: (920) 725-0991
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Surgery Physician (primary) Taxonomy 208600000X · Licence 44570 (WI)
Surgical Critical Care Physician Taxonomy 2086S0102X · Licence 44570 (WI)
Trauma Surgery Physician Taxonomy 2086S0127X · Licence 44570 (WI)
Vascular Surgery Physician Taxonomy 2086S0129X · Licence 44570 (WI)
Colon & Rectal Surgery Physician Taxonomy 208C00000X · Licence 44570 (WI)

Record details

NPI number1104876945
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMay 11, 2006
Last updated in NPPESMay 8, 2008

Medicare enrollment

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

Medicare specialtyGENERAL SURGERY
Also practisesCOLORECTAL SURGERY (PROCTOLOGY), SURGICAL ONCOLOGY, THORACIC SURGERY, VASCULAR SURGERY
Medical schoolUNIVERSITY OF WISCONSIN SCHOOL OF MEDICINE
Graduated 1997 (29 years in practice)
Group practice Surgical Associates Of Neenah, S.C. — 29 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.

Upper gastrointestinal (GI) endoscopy for acid reflux 46 times · 62nd percentile
Colonoscopy 44 times · 61st percentile
Hernia repair (minimally invasive) 1–10 times
Removal of tissue 1–10 times
Varicose vein removal 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 patients151
Services billed 279 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

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.

Food and Beverage $108 4 payments · 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.

Colleagues at Surgical Associates of Neenah, SC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 29 clinicians in the practice; 12 are shown here.

Other providers in Neenah