Markham L. Nightengale, M. D.
NPI 1144215971ActiveIndividual· Internal Medicine, Gastroenterology· Tulsa, OK
Internal Medicine, Gastroenterology (M. D.) with Creek Nation Hospital and Clinics and 1 other group, practicing in Tulsa, Oklahoma. In 2024 Medicare paid $155,280 for 613 patients, and Part D covered 1,190 of their prescriptions, 79% of them generic. Pfizer Inc. was the largest of 4 companies reporting payments in 2025, $208.38 in all, mostly food and beverage. Lists Council Oak Comprehensive Healthcare and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1144215971 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M. D. |
| Sole proprietor | No |
| NPI issued | Sep 19, 2005 |
| Last updated in NPPES | Mar 19, 2025 |
| Certified by provider | Mar 19, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 18311 | 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 - Gastroenterology (OK); Practitioner - Gastroenterology (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 613 |
|---|---|
| Services billed | 3,161 across 30 procedure codes |
| Paid by Medicare | $155,280 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,190 · 2,624 30-day fills |
|---|---|
| Patients | 497 |
| Total drug cost | $144,261 |
| Generic share | 79% of claims |
Education and affiliations
| Graduation year | 1988 |
|---|---|
| Medicare specialty | Gastroenterology |
Medical groups
- Creek Nation Hospital and ClinicsOkmulgee, OK · 365 clinicians
- Adult Gastroenterology Associates IncBartlesville, OK · 15 clinicians
Hospital affiliations
- Council Oak Comprehensive HealthcareTulsa, OK
- Muscogee (Creek) Nation Medical CenterOkmulgee, OK
- Oklahoma Surgical Hospital, LLCTulsa, OK
- Saint Francis Hospital South, LLCTulsa, OK
- Saint Francis Hospital, IncTulsa, OK
Industry payments (Open Payments)
- 2025$208.38 · 10 payments from 4 companies
- 2024$199.23 · 9 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $82.07 | 4 |
| Abbvie Inc. | $77.33 | 4 |
| Lilly USA, LLC | $25.22 | 1 |
| Medtronic, Inc. | $23.76 | 1 |
What the 2025 payments were for
- Food and Beverage$208.38 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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