Oliver Lee Gregory, M.D.
NPI 1588772545ActiveIndividual· Psychiatry & Neurology, Psychiatry· Chattanooga, TN
Psychiatry & Neurology, Psychiatry (M.D.) in Chattanooga, Tennessee, trained at University of Tennessee, Hsc, College of Medicine (class of 1988). Their prescriptions cost Medicare Part D more than their services did: $657,855 for 3,907 claims, against $134,959 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 16 companies reporting payments in 2025, $3,129 in all, mostly food and beverage.
Overview
| NPI | 1588772545 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Aug 29, 2006 |
| Last updated in NPPES | Jul 30, 2026 |
| Certified by provider | Jul 30, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | 19965 | TN |
| Psychiatry & Neurology, Child & Adolescent Psychiatry | 2084P0804X | 19965 | TN |
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 - Psychiatry (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 303 |
|---|---|
| Services billed | 2,313 across 20 procedure codes |
| Paid by Medicare | $134,959 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,907 · 6,466 30-day fills |
|---|---|
| Patients | 477 |
| Total drug cost | $657,855 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | University of Tennessee, Hsc, College of Medicine |
|---|---|
| Graduation year | 1988 |
| Medicare specialty | Psychiatry |
| Telehealth | Offers telehealth |
Medical group
- River Region Psychiatry Associates, LLCDalton, GA · 122 clinicians
Hospital affiliation
- Parkridge Medical CenterChattanooga, TN
Industry payments (Open Payments)
- 2025$3,129 · 143 payments from 16 companies
- 2024$2,036 · 94 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $536.64 | 19 |
| Vanda Pharmaceuticals Inc. | $418.42 | 13 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $356.25 | 12 |
| Alkermes, Inc. | $318.13 | 18 |
| E.R. Squibb & Sons, L.L.C. | $283.43 | 13 |
What the 2025 payments were for
- Food and Beverage$3,129 · 143 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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