John S. Marouk, D.O.
NPI 1427099035ActiveIndividual· Neurological Surgery· Tulsa, OK
Neurological Surgery (D.O.) in Tulsa, Oklahoma, trained at Oklahoma State University College of Osteopathic Medicine (class of 1991). 189 Medicare patients in 2024, $123,108 paid; nearly all of their 193 Part D prescriptions were generic (99%). Intrinsic Therapeutics was the largest of 4 companies reporting payments in 2025, $188.75 in all, mostly food and beverage.
Overview
| NPI | 1427099035 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Jun 8, 2006 |
| Last updated in NPPES | Jul 28, 2025 |
| Certified by provider | Jul 28, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Neurological Surgery Primary | 207T00000X | 3038 | 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 - Neurosurgery (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 189 |
|---|---|
| Services billed | 609 across 65 procedure codes |
| Paid by Medicare | $123,108 |
Part D prescriptions in 2024
| Prescriptions (claims) | 193 · 222 30-day fills |
|---|---|
| Patients | 66 |
| Total drug cost | $2,757 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Oklahoma State University College of Osteopathic Medicine |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Neurosurgery |
Medical group
- Neurological Surgery IncTulsa, OK · 11 clinicians
Hospital affiliations
- Cleveland Area HospitalCleveland, OK
- Hillcrest Hospital SouthTulsa, OK
- Hillcrest Medical CenterTulsa, OK
- Oklahoma Surgical Hospital, LLCTulsa, OK
- Saint Francis Hospital, IncTulsa, OK
Industry payments (Open Payments)
- 2025$188.75 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Intrinsic Therapeutics | $83.73 | 1 |
| Medtronic, Inc. | $40.51 | 1 |
| Stryker Corporation | $34.16 | 1 |
| Providence Medical Technology, Inc. | $30.35 | 1 |
What the 2025 payments were for
- Food and Beverage$188.75 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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