Quick answers
- Which hospitals does Winifred O. Oniah work at?
- Medicare's official clinician data lists Winifred O. Oniah at 1 hospital: Methodist Hospitals Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Winifred O. Oniah see patients?
- Medicare's clinician data lists 2 practice locations, including Merrillville, IN. Call before your visit to confirm the address.
- What is Winifred O. Oniah's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Winifred O. Oniah accept Medicare assignment?
- Yes. Medicare's clinician data says Winifred O. Oniah 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 Winifred O. Oniah's NPI number?
- 1831183185. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Winifred O. Oniah works
Medicare's Facility Affiliation Data lists Winifred O. Oniah at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Methodist Hospitals IncGary, IN · Acute Care Hospital · CCN 150002
Practice locations
Addresses where Winifred O. Oniah is enrolled with Medicare (CMS data updated 2026-10-02).
- 55 E 86th AveMerrillville, IN 46410
- 8777 BroadwayMerrillville, IN 46410
Specialties
- Family Practiceprimary
Other family doctors in Merrillville
Clinicians with the same Medicare primary specialty in Merrillville, IN — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1992 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831183185 |
| 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