Quick answers
- Which hospitals does John A. Oconnor work at?
- Medicare's official clinician data lists John A. Oconnor at 2 hospitals: Ascension St Vincent Hospital and Ascension St Vincent Kokomo. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John A. Oconnor see patients?
- Medicare's clinician data lists 2 practice locations, including Indianapolis, IN. Call before your visit to confirm the address.
- What is John A. Oconnor's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does John A. Oconnor accept Medicare assignment?
- Yes. Medicare's clinician data says John A. Oconnor 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 A. Oconnor?
- (317) 338-2345, as listed in official Medicare / NPI Registry data.
- What is John A. Oconnor's NPI number?
- 1700053816. 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 A. Oconnor works
Medicare's Facility Affiliation Data lists John A. Oconnor at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension St Vincent HospitalIndianapolis, IN · Acute Care Hospital · CCN 150084
- Ascension St Vincent KokomoKokomo, IN · Acute Care Hospital · CCN 150010
Practice locations
Addresses where John A. Oconnor is enrolled with Medicare (CMS data updated 2026-10-02).
- 2001 W 86th StIndianapolis, IN 46260 (317) 338‑2345
- 8240 Naab Rd, Suite 155Indianapolis, IN 46260 (317) 338‑7760
Group practices
Medicare enrollment lists John A. Oconnor as a member of this group (CMS data updated 2026-10-02).
- St Vincent Physician Services Hospital and Health Care Center275 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Indianapolis
Clinicians with the same Medicare primary specialty in Indianapolis, IN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Indiana University School Of Medicine |
| Graduation year | 2005 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1700053816 |
| 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