Cathy Nieman, MD
NPI 1578556171ActiveIndividual· Internal Medicine· Stillwater, OK
Internal Medicine (MD) in Stillwater, Oklahoma, trained at University of Oklahoma College of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $873,710 for 10,251 claims, against $164,757 paid for services in 2024. Astellas Pharma US Inc was the largest of 3 companies reporting payments in 2025, $88.42 in all, mostly food and beverage.
Overview
| NPI | 1578556171 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 30, 2005 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 20253 | OK |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 593 |
|---|---|
| Services billed | 2,820 across 75 procedure codes |
| Paid by Medicare | $164,757 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,251 · 17,404 30-day fills |
|---|---|
| Patients | 438 |
| Total drug cost | $873,710 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Internal Medicine |
Medical groups
- Select Physical Therapy Holdings IncClarksville, TN · 2,024 clinicians
- Stillwater Medical Center AuthorityStillwater, OK · 153 clinicians
Hospital affiliations
- Integris Health Ponca CityPonca City, OK
- O U Medical CenterOklahoma City, OK
- Stillwater Medical - PerryPerry, OK
- Stillwater Medical CenterStillwater, OK
- Stillwater Medical-BlackwellBlackwell, OK
Other facilities
- Companion Home Health, LLCHome health agency · Guthrie, OK
- Complete Home Health of Western OklahomaHome health agency · Tulsa, OK
- Elara Caring XviiiHome health agency · Stillwater, OK
- Stillwater Medical at HomeHome health agency · Stillwater, OK
Industry payments (Open Payments)
- 2025$88.42 · 4 payments from 3 companies
- 2024$58.26 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astellas Pharma US Inc | $51.52 | 2 |
| Abbvie Inc. | $19.49 | 1 |
| Inspire Medical Systems, Inc. | $17.41 | 1 |
What the 2025 payments were for
- Food and Beverage$88.42 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 33 internal medicine physicians in Stillwater · All internal medicine physicians in Oklahoma