MARKHAM L NIGHTENGALE (M. D.) – Gastroenterology Physician, NPI 1144215971
Gastroenterology Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
143 GASTROENTEROLOGY in OK
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Provider Addresses for MARKHAM L NIGHTENGALE (M. D.)
South Yale Avenue, Bixby, Tulsa, Oklahoma, 74008, United States
SUITE 1002
TULSA, OK 741367823
Phone: (918) 481-4706
Fax: (918) 481-4765
Type: Location
PO BOX 305
LOWELL, AR 727450305
Phone: (918) 481-4706
Fax: (918) 481-4765
Type: Mailing
4200 E SKELLY DR STE 700
TULSA, OK 741353256
Phone: (918) 438-7050
Fax: (918) 221-0835
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 26 Open Payments records for all available years, with a total value of $404.
Total Amount is formed as General ($404) + Research ($0) + Ownership ($0) = $404.
Last reported payment date: 2024-12-09 • Largest payer in this snapshot: ABBVIE INC. ($295).
Total Amount
$404
General + Research + Ownership
Payments
26
Total payment records
General Amount
$404
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
2
Ownership records
Last Payment Date
2024-12-09
Latest reported date
Top Companies
Largest payers in this snapshot
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2023-01-03
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20100927000063 | I | Gastroenterology | OK | TBD |
| I20230103000458 | I | Gastroenterology | TX | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 45385 | Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 237 | 236 | $0 |
| 43239 | Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 205 | 199 | $0 |
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 190 | 172 | $0 |
| 99204 | New patient office or other outpatient visit, 45-59 minutes | 121 | 121 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 118 | 99 | $0 |
Insurance plans in this area (ZIP 74136)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| GASTROENTEROLOGY | OK | 43235 | Diagnostic examination of esophagus, stomach, and/or upper small bowel using an endoscope | 18 | 18 |
| GASTROENTEROLOGY | OK | 88312 | Special stained specimen slides to identify organisms including interpretation and report | 156 | 153 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | OK | |
| Nurse Practitioner | OK | |
| - | OK | |
| - | OK | |
| - | OK | |
| - | OK | |
| - | OK | |
| Emergency Medicine | OK | |
| Internal Medicine, Hospice/Palliative Care | OK | |
| - | WI |
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