Patrick R. Volak, M. D.
NPI 1174518336ActiveIndividual· Internal Medicine, Gastroenterology· Tulsa, OK
Internal Medicine, Gastroenterology (M. D.) in Tulsa, Oklahoma, trained at University of Oklahoma College of Medicine (class of 1985). Their prescriptions cost Medicare Part D more than their services did: $589,425 for 1,211 claims, against $300,250 paid for services in 2024. Abbvie Inc. was the largest of 21 companies reporting payments in 2025, $2,886 in all, mostly food and beverage.
Overview
| NPI | 1174518336 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M. D. |
| Sole proprietor | No |
| NPI issued | Sep 14, 2005 |
| Last updated in NPPES | Mar 29, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 15783 | 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 | 680 |
|---|---|
| Services billed | 12,813 across 37 procedure codes |
| Paid by Medicare | $300,250 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,211 · 1,967 30-day fills |
|---|---|
| Patients | 477 |
| Total drug cost | $589,425 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical groups
- Cherokee NationTahlequah, OK · 449 clinicians
- Creek Nation Hospital and ClinicsOkmulgee, OK · 365 clinicians
- Adult Gastroenterology Associates IncBartlesville, OK · 15 clinicians
Hospital affiliations
- Muscogee (Creek) Nation Medical CenterOkmulgee, OK
- Oklahoma Surgical Hospital, LLCTulsa, OK
- Saint Francis Hospital MuskogeeMuskogee, OK
- Saint Francis Hospital South, LLCTulsa, OK
- Saint Francis Hospital, IncTulsa, OK
Industry payments (Open Payments)
- 2025$2,886 · 147 payments from 21 companies
- 2024$2,163 · 125 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $594.45 | 41 |
| Pfizer Inc. | $389.82 | 19 |
| Janssen Biotech, Inc. | $316.39 | 17 |
| Takeda Pharmaceuticals U.S.A., Inc. | $311.93 | 15 |
| Lilly USA, LLC | $241.72 | 10 |
What the 2025 payments were for
- Food and Beverage$2,886 · 147 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 58 gastroenterologists in Tulsa · All gastroenterologists in Oklahoma