Quick answers
- Which hospitals does John J. Oconnell work at?
- Medicare's official clinician data lists John J. Oconnell at 5 hospitals: Prisma Health Greenville Memorial Hospital, Prisma Health Greer Memorial Hospital, Prisma Health Hillcrest Hospital, Prisma Health Oconee Memorial Hospital and Prisma Health Patewood Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John J. Oconnell see patients?
- Medicare's clinician data lists 10 practice locations, including Seneca, SC, Duncan, SC and Greenville, SC. Call before your visit to confirm the address.
- What is John J. Oconnell's specialty?
- Medicare lists Radiation Oncology as the primary specialty.
- Does John J. Oconnell accept Medicare assignment?
- Yes. Medicare's clinician data says John J. Oconnell 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 J. Oconnell?
- (864) 888-3717, as listed in official Medicare / NPI Registry data.
- What is John J. Oconnell's NPI number?
- 1952455768. 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 J. Oconnell works
Medicare's Facility Affiliation Data lists John J. Oconnell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Prisma Health Greenville Memorial HospitalGreenville, SC · Acute Care Hospital · CCN 420078
- Prisma Health Greer Memorial HospitalGreer, SC · Acute Care Hospital · CCN 420033
- Prisma Health Hillcrest HospitalSimpsonville, SC · Acute Care Hospital · CCN 420037
- Prisma Health Oconee Memorial HospitalSeneca, SC · Acute Care Hospital · CCN 420009
- Prisma Health Patewood HospitalGreenville, SC · Acute Care Hospital · CCN 420102
Practice locations
Addresses where John J. Oconnell is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 10; the Medicare profile lists all.
- 131 Lila Doyle DrSeneca, SC 29672 (864) 888‑3717
- 139 Lila Doyle DrSeneca, SC 29672 (864) 482‑3483
- 210 Freeman Farm RdDuncan, SC 29334 (864) 968‑5123
- 300 E McBee AveGreenville, SC 29601 (864) 797‑6220
- 300 E McBee Ave Fl, Suite 4Greenville, SC 29601
Group practices
Medicare enrollment lists John J. Oconnell as a member of this group (CMS data updated 2026-10-02).
- Prisma Health University Medical Group2,493 clinicians in the group
Specialties
- Radiation Oncologyprimary
Other radiation oncologists in South Carolina
Clinicians with the same Medicare primary specialty in South Carolina — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1993 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1952455768 |
| 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