NPPES file of Aug 9, 2026

Siobhan M. Byrne, M.D.

Gastroenterology Physician · Madison, WI

Siobhan M. Byrne, M.D. is a gastroenterology physician with a practice address in Madison, Wisconsin, and NPI 1417915836, issued on May 3, 2006. Check the license (Wisconsin 50303, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1417915836
Name
Siobhan M. Byrne
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
License number
50303 WI
Self-reported in NPPES; status is on the state search
Practice location
20 S Park St, Madison, WI 53715
Phone
(608) 287-2680
Enumerated
May 3, 2006
Record last updated
Jan 5, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20110201000773); accepts Medicare assignment
Medical or professional school
University Of Washington School Of Medicine, 2005
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 20 S Park St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Luke Addesso, MDPediatrics Physician1013470186
  2. Mackenzie Asel, M.D.Dermatology Physician1831538099
  3. Elizabeth Bartholomew, LCSWClinical Social Worker1679851398
  4. Sarah Benedict, NPNurse Practitioner1336648039
  5. Eliza Bennett, M.D.Obstetrics & Gynecology Physician1003852161
  6. Stephen Bernsten, MDPlastic Surgery Physician1114989043

Verify Siobhan M. Byrne in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 50303    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Wisconsin license search

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23% fewer Medicare Part D claims than the average gastroenterology physician in 2024

623 Medicare Part D claims for 293 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D.

  1. Siobhan Byrne623
  2. Specialty average811

Most prescribed

  1. Gavilyte-C217 claims
  2. Mesalamine100 claims
  3. Azathioprine55 claims
  4. Omeprazole38 claims
  5. Humira(Cf) Pen24 claims
  6. Budesonide Dr21 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 one group practice

  1. University OF Wisconsin Medical Foundation IncVerona, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Gastroenterology Physician providers in Wisconsin

There are 340 gastroenterology physician records in Wisconsin.

All 340 in Wisconsin → Every provider in Madison →

Other gastroenterology physician records in Wisconsin

  1. Frank Aberger, MDLa Crosse, WI1396748711
  2. Mohammad Abuassi, M.D.Milwaukee, WI1275211567
  3. Kwabena Adu-Gyamfi, MDGreen Bay, WI1154677391
  4. Aboud Affi, M.D.Milwaukee, WI1003891250
  5. Dilpesh Agrawal, M.D, MRCPMilwaukee, WI1407134422
  6. Awais Ahmed, MDOshkosh, WI1316213481
  7. Trupti Akella, M.D.New Berlin, WI1215321690
  8. Adebisi Alimi, M.D.Sheboygan, WI1649599317
  9. Jihad Aljabban, MD, MMSCMadison, WI1699304808
  10. Michael Allan, MDMadison, WI1558300822

Common questions

What is Siobhan M. Byrne, M.D.'s NPI number?

Siobhan M. Byrne, M.D.'s National Provider Identifier (NPI) is 1417915836, issued on May 3, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Siobhan M. Byrne, M.D. located?

The NPPES record lists a practice address at 20 S Park St, Madison, WI, 53715. Phone: (608) 287-2680. Providers update this record themselves, so call before visiting.

How can I verify Siobhan M. Byrne, M.D.'s license?

NPPES lists Wisconsin license number 50303, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Siobhan M. Byrne, M.D. prescribe under Medicare Part D?

In 2024, Siobhan M. Byrne, M.D. had 623 Medicare Part D claims for 293 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.