Oliver Gregory, M.D.
NPI 1588772545 · Psychiatry Physician · Chattanooga, TN
Enrolled with Medicare as Practitioner - Psychiatry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Oliver Gregory, M.D. is a Psychiatry Physician provider in Chattanooga, TN (NPI 1588772545).
Provider details
- NPI number
- 1588772545
- Entity type
- Individual
- Primary specialty
- Psychiatry PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 19965 (TN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,280 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 446 | $110 |
| Evaluation of Neuropsychological Test, First Hour96132 | 330 | $113 |
| Administration of Psychological Or Neuropsychological Test, First 30 Minutes96136 | 330 | $36 |
| Assessment of Emotional Or Behavioral Problems96127 | 279 | $4 |
| Psychotherapy With Evaluation and Management Visit, 30 Minutes90833 | 155 | $63 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 154 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 57 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Trazodone Hcl | 319 | 121 |
| Clonazepam | 220 | 57 |
| Lamotrigine | 203 | 64 |
| Duloxetine Hcl | 164 | 62 |
| Quetiapine Fumarate | 163 | 53 |
| Gabapentin | 161 | 46 |
| Buspirone Hcl | 147 | 61 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,036 across 94 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-08-29
- Last updated
- 2019-01-03
Frequently asked questions
- What is Oliver Gregory's NPI number?
- Oliver Gregory's National Provider Identifier (NPI) is 1588772545, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Oliver Gregory's specialty?
- Oliver Gregory is listed in the NPPES registry with a primary specialty of Psychiatry Physician (Allopathic & Osteopathic Physicians).
- Where is Oliver Gregory located?
- Oliver Gregory's practice location on file with NPPES is 7345 Courage Way, Chattanooga, TN 37421-1555.
- What is Oliver Gregory's phone number?
- The practice phone number listed in the NPPES registry for Oliver Gregory is (423) 648-9290.
- Does Oliver Gregory accept Medicare?
- Oliver Gregory is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Oliver Gregory's NPI active?
- Yes — Oliver Gregory's NPI (1588772545) is active in the NPPES registry as of the last update on 2019-01-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.