Quick answers
- Which hospitals does William O'Neill work at?
- Medicare's official clinician data lists William O'Neill at 4 hospitals: HCA Florida Largo Hospital, Robert Wood Johnson University Hospital at Hamilton, Tacoma General Allenmore Hospital and Union Hospital Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William O'Neill see patients?
- Medicare's clinician data lists 3 practice locations, including Hamilton, NJ, Ocala, FL and Largo, FL. Call before your visit to confirm the address.
- What is William O'Neill's specialty?
- Medicare lists Pathology as the primary specialty.
- Does William O'Neill accept Medicare assignment?
- Yes. Medicare's clinician data says William O'Neill 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 William O'Neill?
- (352) 401-1134, as listed in official Medicare / NPI Registry data.
- What is William O'Neill's NPI number?
- 1922118900. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William O'Neill works
Medicare's Facility Affiliation Data lists William O'Neill at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- HCA Florida Largo HospitalLargo, FL · Acute Care Hospital · CCN 100248
- Robert Wood Johnson University Hospital at HamiltonHamilton, NJ · Acute Care Hospital · CCN 310110
- Tacoma General Allenmore HospitalTacoma, WA · Acute Care Hospital · CCN 500129
- Union Hospital IncTerre Haute, IN · Acute Care Hospital · CCN 150023
Practice locations
Addresses where William O'Neill is enrolled with Medicare (CMS data updated 2026-10-02).
- 1 Hamilton Health PlHamilton, NJ 08690
- 1431 SW 1st AveOcala, FL 34471 (352) 401‑1134
- 201 14th St SWLargo, FL 33770 (727) 588‑5812
Group practices
Medicare enrollment lists William O'Neill as a member of these groups (CMS data updated 2026-10-02).
- Rutgers Health-Rwj Pediatric Critical Care156 clinicians in the group
- Integrated Regional Laboratories Pathology Services, LLC131 clinicians in the group
Specialties
- Pathologyprimary
Other pathologists in Hamilton
Clinicians with the same Medicare primary specialty in Hamilton, NJ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1922118900 |
| 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