NPPES file of Aug 9, 2026

Sean M. O'Neill, M.D.

Hospitalist Physician · Madison, WI

Sean M. O'Neill, M.D. is a hospitalist physician with a practice address in Madison, Wisconsin, and NPI 1528298213, issued on Jul 16, 2009. Check the license (Wisconsin 55223, 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 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1528298213
Name
Sean M. O'Neill
Credential
M.D.
Primary taxonomy
Hospitalist Physician 208M00000X
License number
55223 WI
Self-reported in NPPES; status is on the state search
Practice location
UW Hospital And Clinics, Madison, WI 53792
Phone
(608) 263-0572
Enumerated
Jul 16, 2009
Record last updated
Sep 7, 2023
Fax
(608) 890-7127
Medicare enrollment
Enrolled (PECOS I20120229000415); accepts Medicare assignment
Medical or professional school
Creighton University School Of Medicine, 2009
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.
Download card Updates feed

8 nearest hospitalist physician records → All 894 in Wisconsin → Look up another NPI →

Also registered at UW Hospital And Clinics

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

  1. Amin Afrazi, MD,PH.DSurgery Physician1073931358
  2. Madelyn Alvarez, MDInternal Medicine Physician1063831717
  3. Corey Amlong, M.D.Anesthesiology Physician1235454067
  4. Kerstin Austin, M.D.Gastroenterology Physician1497013023
  5. James Bauer, M.D.Anatomic Pathology & Clinical Pathology Physician1902249543
  6. Lisa BodenhamerPsychiatry Physician1255750733

Verify Sean M. O'Neill in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 55223    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

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

Is this page about you? You can ask us to correct, restrict or remove it: how.

Bills Medicare through one group practice

  1. University OF Wisconsin Medical Foundation IncMadison, WI

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

Sean M. O'Neill among 894 hospitalist physician records in Wisconsin

Sean M. O'Neill, M.D. is one of 894 hospitalist physician records with a practice address in Wisconsin. 91% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 30% of them.

  • NPI issued2009 · 30% of these records are older, 66% newer
  • In a Medicare fileYes · 91% of these records are
  • In the CMS Doctors and Clinicians fileYes · 86% of these records are
  • Graduated2009 · median 2011 among the 768 with a school on file
  • Record last updated2023 · 29% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Hospitalist Physician providers in Wisconsin

There are 894 hospitalist physician records in Wisconsin.

All 894 in Wisconsin → Every provider in Madison → Hospitalist Physician nationwide →

The 8 hospitalist physician records with the nearest ZIP codes

  1. Sarah Ahrens, MDMadison, WI 537921497796924
  2. Romeo Barakeh, MDMadison, WI 537921205863503
  3. Ellen Barbouche, MDMadison, WI 537921467429167
  4. Bartho Caponi, M.D.Madison, WI 537921326006743
  5. Ann Curtis, MDMadison, WI 537921669585295
  6. David Gaus, MDMadison, WI 537921639284631
  7. Edward Lalik, D.O.Madison, WI 537921790770857
  8. Scott Mead, MDMadison, WI 537921528034568

Common questions

What is Sean M. O'Neill, M.D.'s NPI number?

Sean M. O'Neill, M.D.'s National Provider Identifier (NPI) is 1528298213, issued on Jul 16, 2009. An NPI identifies a provider in billing; it is not a license.

Where is Sean M. O'Neill, M.D. located?

The NPPES record lists a practice address at UW Hospital And Clinics, Madison, WI, 53792. Phone: (608) 263-0572. Providers update this record themselves, so call before visiting.

How can I verify Sean M. O'Neill, M.D.'s license?

NPPES lists Wisconsin license number 55223, 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.

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.