Katherine Dewitt Cook, DO
NPI 1821253410ActiveIndividual· Internal Medicine· Tulsa, OK
Internal Medicine (DO) in Tulsa, Oklahoma, trained at Oklahoma State University College of Osteopathic Medicine (class of 2007). Their prescriptions cost Medicare Part D more than their services did: $166,472 for 269 claims, against $90,878 paid for services in 2024. Gilead Sciences, Inc. was the largest of 3 companies reporting payments in 2025, $153.72 in all, mostly food and beverage.
Overview
| NPI | 1821253410 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Jul 23, 2008 |
| Last updated in NPPES | Jun 12, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 4629 | 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 | 376 |
|---|---|
| Services billed | 1,072 across 28 procedure codes |
| Paid by Medicare | $90,878 |
Part D prescriptions in 2024
| Prescriptions (claims) | 269 · 386 30-day fills |
|---|---|
| Patients | 100 |
| Total drug cost | $166,472 |
| Generic share | 71% of claims |
Education and affiliations
| Medical school | Oklahoma State University College of Osteopathic Medicine |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Oklahoma State UniversityTulsa, OK · 108 clinicians
Hospital affiliations
- Cherokee Nation W W Hastings Indian HospitalTahlequah, OK
- Choctaw Nation Health Services AuthorityTalihina, OK
- Cleveland Area HospitalCleveland, OK
- McAlester Regional Health CenterMcAlester, OK
- Oklahoma State University Medical CenterTulsa, OK
Industry payments (Open Payments)
- 2025$153.72 · 7 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $58.69 | 2 |
| Viiv Healthcare Company | $53.44 | 3 |
| Emd Serono, Inc. | $41.59 | 2 |
What the 2025 payments were for
- Food and Beverage$153.72 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 373 internal medicine physicians in Tulsa · All internal medicine physicians in Oklahoma