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SEAN M O'NEILL M.D.
NPI 1528298213
Hospitalist in Madison, WI

Active since July 16, 2009PECOS EnrolledAccepts Medicare Assignment
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, MADISON, WI 53792(608) 263-0572(608) 890-7127 Get Directions Write a Review

NPPES record last updated: September 7, 2023. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Sean M O'neill M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

SEAN M O'NEILL M.D. (NPI 1528298213) is an individual hospitalist provider in Madison, Wisconsin, licensed in Wisconsin (55223) and active in the NPI registry since July 2009. He is enrolled in Medicare PECOS, is affiliated with University Of Wi Hospitals & Clinics Authority, and is a graduate of Creighton University School Of Medicine (2009).

NPPES Registry Identity

NPI1528298213
Entity TypeIndividualMale
Primary Taxonomy208M00000X
Provider Legal NameSEAN M O'NEILLCredential: M.D.
Location AddressUW HOSPITAL AND CLINICS, 600 HIGHLAND AVEMadison, WI 53792-0001
Mailing Address7027 Maywood AveMiddleton, WI 53562-2726 · (608) 345-2253 · Fax (608) 890-7127
Phone(608) 263-0572
Fax(608) 890-7127
Sole ProprietorNo
Medical School CMSCreighton University School Of MedicineGraduated 2009
Enumeration DateJuly 16, 2009
Last NPPES UpdateSeptember 7, 2023
✔ NPI 1528298213 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyHospitalistAllopathic & Osteopathic Physicians
Taxonomy Code208M00000X
License✔ Licensed in WI · 55223
Definition
Hospitalists are physicians whose primary professional focus is the general medical care of hospitalized patients. Their activities include patient care, teaching, research, and leadership related to Hospital Medicine. The term 'hospitalist' refers to physicians whose practice emphasizes providing care for hospitalized patients.
UW HOSPITAL AND CLINICS, Madison, WI 53792
Open in Google Maps ↗

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Sean M O'neill M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3971761479
PECOS Enrollment IDI20120229000415
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Sean O'neill reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Wisconsin Medical Foundation, Inc
4.9 mi
Multi-Specialty
7974 UW HEALTH COURT
Middleton, WI 53562
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,832 clinicians in this Medicare group
NPI 1598784555 (608) 829-5485

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 5

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
122 services37 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
61 services61 patients
Hospital discharge day management, 30 minutes or less 99238
Hospital discharge day management of 30 minutes or less includes finalizing your treatment, discussing your progress, and planning after-care at home. It ensures you're ready to leave the hospital and continue recovery safely.
25 services25 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
24 services24 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
24 services12 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

University Of Wi Hospitals & Clinics Authority

Acute Care Hospitals · Madison, WI
4/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number520098
Location600 Highland AvenueMadison, WI 53792 · Dane County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53792 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$123.69 typical visit price
range $53.90 – $163.24
Typical copayment $30.92 (range $13.47 – $40.81)
Most-billed visit code 99204
Established Patient
$95.41 typical visit price
range $17.40 – $133.76
Typical copayment $23.85 (range $4.35 – $33.44)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DINA MARIE PITTA MD
Surgery
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-6400
CAN M SAVASMAN M.D.
Student in an Organized Health Care Education/Training Program
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 262-7158
JUDITH NIR M.D.
Student in an Organized Health Care Education/Training Program
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-0572
MADELYN KAY ALVAREZ MD
Internal Medicine
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-5660
DR. IAN JOSEPH KOSZEWSKI M.D.
Otolaryngology
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-0192
DR. AMIN AFRAZI MD,PH.D
Surgery
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE, H4/831
MADISON, WI 53792
Dane County (608) 263-1377
DANIEL R MATSON
Pathology (Hematology)
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVENUE
MADISON, WI 53792
Dane County (608) 263-8443
MEGAN E PETERS M.D.
Pediatrics (Pediatric Critical Care Medicine)
UW HOSPITAL AND CLINICS, 600 HIGHLAND AVE
MADISON, WI 53792
Dane County (608) 263-8049

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Sean O'neill's NPI number?

The NPI number for Sean O'neill is 1528298213. It was assigned to this individual provider in the NPPES registry on July 16, 2009.

Where is Sean O'neill located?

Sean O'neill practices at Uw Hospital And Clinics 600 Highland Ave, Madison, WI 53792. The listed phone number is (608) 263-0572.

What is Sean O'neill's specialty?

The primary specialty registered for this NPI is Hospitalist with taxonomy code 208M00000X.

Is Sean O'neill enrolled in Medicare?

Yes. Sean O'neill is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Sean O'neill's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Sean O'neill reassigns Medicare benefits to University Of Wisconsin Medical Foundation, Inc (Middleton, WI). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Sean O'neill's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Sean O'neill affiliated with any hospitals?

According to CMS data, Sean O'neill is affiliated with University Of Wi Hospitals & Clinics Authority.

When was this NPI record last updated?

The NPPES record for Sean O'neill was last updated on September 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.