Quick answers
- Which hospitals does Catherine E. Nieman work at?
- Medicare's official clinician data lists Catherine E. Nieman at 5 hospitals: INTEGRIS Health Ponca City, O U Medical Center, Stillwater Medical - Perry, Stillwater Medical Center and Stillwater Medical-Blackwell. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Catherine E. Nieman see patients?
- Medicare's clinician data lists 2 practice locations, including Stillwater, OK. Call before your visit to confirm the address.
- What is Catherine E. Nieman's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Catherine E. Nieman accept Medicare assignment?
- Yes. Medicare's clinician data says Catherine E. Nieman 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 Catherine E. Nieman?
- (405) 743-7300, as listed in official Medicare / NPI Registry data.
- What is Catherine E. Nieman's NPI number?
- 1578556171. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Catherine E. Nieman works
Medicare's Facility Affiliation Data lists Catherine E. Nieman at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- INTEGRIS Health Ponca CityPonca City, OK · Acute Care Hospital · CCN 370006
- O U Medical CenterOklahoma City, OK · Acute Care Hospital · CCN 370093
- Stillwater Medical - PerryPerry, OK · Rural Emergency Hospital · CCN 370779
- Stillwater Medical CenterStillwater, OK · Acute Care Hospital · CCN 370049
- Stillwater Medical-BlackwellBlackwell, OK · Rural Emergency Hospital · CCN 370780
Practice locations
Addresses where Catherine E. Nieman is enrolled with Medicare (CMS data updated 2026-10-02).
- 1815 W 6th AveStillwater, OK 74074 (405) 743‑7300
- 2230 N Perkins RdStillwater, OK 74075 (405) 780‑9919
Group practices
Medicare enrollment lists Catherine E. Nieman as a member of these groups (CMS data updated 2026-10-02).
- Select Physical Therapy Holdings Inc2,024 clinicians in the group
- Stillwater Medical Center Authority153 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Stillwater
Clinicians with the same Medicare primary specialty in Stillwater, OK — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Oklahoma College Of Medicine |
| Graduation year | 1996 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578556171 |
| 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