Quick answers
- Which hospitals does John O'Boyle work at?
- Medicare's official clinician data lists John O'Boyle at 5 hospitals: Ascension Columbia St Marys Hospital Milwaukee, Aultman Hospital, Luminis Health Anne Arundel Medical Center, Inc, Luminis Health Doctors Community Medical Ctr, Inc and Regions Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John O'Boyle see patients?
- Medicare's clinician data lists 7 practice locations, including Mequon, WI, Chester, MD and Milwaukee, WI. Call before your visit to confirm the address.
- What is John O'Boyle's specialty?
- Medicare lists Gynecological Oncology as the primary specialty.
- Does John O'Boyle accept Medicare assignment?
- Yes. Medicare's clinician data says John O'Boyle accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for John O'Boyle?
- (262) 243-7300, as listed in official Medicare / NPI Registry data.
- What is John O'Boyle's NPI number?
- 1306808381. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John O'Boyle works
Medicare's Facility Affiliation Data lists John O'Boyle at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension Columbia St Marys Hospital MilwaukeeMilwaukee, WI · Acute Care Hospital · CCN 520051
- Aultman HospitalCanton, OH · Acute Care Hospital · CCN 360084
- Luminis Health Anne Arundel Medical Center, IncAnnapolis, MD · Acute Care Hospital · CCN 210023
- Luminis Health Doctors Community Medical Ctr, IncLanham, MD · Acute Care Hospital · CCN 210051
- Regions HospitalSaint Paul, MN · Acute Care Hospital · CCN 240106
Practice locations
Addresses where John O'Boyle is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 7; the Medicare profile lists all.
- 13111 N Port Washington RdMequon, WI 53097 (262) 243‑7300
- 1630 Main StChester, MD 21619 (410) 604‑2555
- 2311 N Prospect AveMilwaukee, WI 53211 (414) 319‑3000
- 2600 6th SwstCanton, OH 44710 (330) 363‑2180
- 640 Jackson StSaint Paul, MN 55101
Group practices
Medicare enrollment lists John O'Boyle as a member of these groups (CMS data updated 2026-10-02).
- Group Health Inc1,638 clinicians in the group
- Luminis Health Medical Group, LLC539 clinicians in the group
- Columbia St Marys Hospital Milwaukee Inc306 clinicians in the group
- Ohio Physician Professional Corporation141 clinicians in the group
Specialties
- Gynecological Oncologyprimary
Other gynecologic oncologists in Wisconsin
Clinicians with the same Medicare primary specialty in Wisconsin — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Uniformed Services Uhs Fe Hebert School Of Med |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1306808381 |
| Corrections | Report an error or suggest an update → |
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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians