Siobhan M. Byrne, MD

Medicare activity in 2024

Official CMS public-use data for Siobhan M. Byrne, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Biopsy of large bowel using a flexible endoscope (45380)121 services
2. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)66 services
3. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)54 services
4. Diagnostic exam of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43235)25 services
5. 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's (G2211)21 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High blood pressure69%
• High cholesterol68%
• Arthritis46%
• Anxiety30%
• Depression28%
• Diabetes26%

Hospitals where Siobhan M. Byrne works

Medicare's Facility Affiliation Data lists Siobhan M. Byrne at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• UnityPoint Health - MeriterMadison, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520089
• University of WI Hospitals & Clinics AuthorityMadison, WI · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 520098

Practice locations

Addresses where Siobhan M. Byrne is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 11; the Medicare profile lists all.

• 1050 E BroadwayMonona, WI 53716 (608) 222‑8779
• 20 S Park StMadison, WI 53715 (608) 287‑2076
• 202 S Park StMadison, WI 53715 (608) 287‑2050
• 2402 Winnebago StMadison, WI 53704
• 2651 Windsor StSun Prairie, WI 53590 (608) 837‑2206

Group practices

Medicare enrollment lists Siobhan M. Byrne as a member of this group (CMS data updated October 2, 2026).

• University of Wisconsin Medical Foundation Inc2,553 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in Wisconsin →

Other gastroenterologists in Wisconsin

Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.

• Alexander K. Larson, MD
• Freddy Caldera Jr., DO
• Christopher Lindholm, MD
• Veronika Gagovic, MD
• Rebecca K. Petrovski, DO
• Achuthan Sourianarayanane, MD
• Mansoor Shariff, MD
• Venelin J. Kounev, MD

All gastroenterologists in Wisconsin →

Other clinicians in University of Wisconsin Medical Foundation Inc

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Dayna M. Wood, NP
• Eric J. Weinlander, MD
• Marylou Hagen, PA
• Aysenur S. Keske, MD
• Zachary N. Stowe, MD
• Amy R. Grelle, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians