Quick answers
- Which hospitals does Markham L. Nightengale work at?
- Medicare's official clinician data lists Markham L. Nightengale at 5 hospitals: Council Oak Comprehensive Healthcare, Muscogee (Creek) Nation Medical Center, Oklahoma Surgical Hospital, LLC, Saint Francis Hospital South, LLC and Saint Francis Hospital, Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Markham L. Nightengale see patients?
- Medicare's clinician data lists 2 practice locations, including Tulsa, OK and Bartlesville, OK. Call before your visit to confirm the address.
- What is Markham L. Nightengale's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Markham L. Nightengale accept Medicare assignment?
- Yes. Medicare's clinician data says Markham L. Nightengale 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 Markham L. Nightengale?
- (918) 756-4333, as listed in official Medicare / NPI Registry data.
- What is Markham L. Nightengale's NPI number?
- 1144215971. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Markham L. Nightengale works
Medicare's Facility Affiliation Data lists Markham L. Nightengale at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Council Oak Comprehensive HealthcareTulsa, OK · Acute Care Hospital · CCN 370244
- Muscogee (Creek) Nation Medical CenterOkmulgee, OK · Acute Care Hospital · CCN 370057
- Oklahoma Surgical Hospital, LLCTulsa, OK · Acute Care Hospital · CCN 370210
- Saint Francis Hospital South, LLCTulsa, OK · Acute Care Hospital · CCN 370218
- Saint Francis Hospital, IncTulsa, OK · Acute Care Hospital · CCN 370091
Practice locations
Addresses where Markham L. Nightengale is enrolled with Medicare (CMS data updated 2026-10-02).
- 10109 E 79th StTulsa, OK 74133 (918) 756‑4333
- 4150 SE Adams RdBartlesville, OK 74006 (918) 438‑7050
Group practices
Medicare enrollment lists Markham L. Nightengale as a member of these groups (CMS data updated 2026-10-02).
- Creek Nation Hospital and Clinics365 clinicians in the group
- Adult Gastroenterology Associates Inc15 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Tulsa
Clinicians with the same Medicare primary specialty in Tulsa, OK — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1144215971 |
| 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