Greg A. Warren, DO
NPI 1245270131ActiveIndividual· Internal Medicine, Nephrology· Elizabeth City, NC
Internal Medicine, Nephrology (DO) in Elizabeth City, North Carolina, trained at Rowan University School of Osteopathic Medicine (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $709,184 for 5,445 claims, against $151,191 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 10 companies reporting payments in 2025, $527.79 in all, mostly food and beverage.
Overview
| NPI | 1245270131 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Jun 8, 2006 |
| Last updated in NPPES | Oct 22, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | — | NC |
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 - Internal Medicine (NC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 736 |
|---|---|
| Services billed | 1,923 across 30 procedure codes |
| Paid by Medicare | $151,191 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,445 · 10,225 30-day fills |
|---|---|
| Patients | 457 |
| Total drug cost | $709,184 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Rowan University School of Osteopathic Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Broad River RehabilitationCharlotte, NC · 202 clinicians
- Sentara Albemarle Regional Medical CenterElizabeth City, NC · 7 clinicians
- Albemarle Nephrology PLLCElizabeth City, NC · 4 clinicians
Hospital affiliations
- Sentara Albemarle Medical CenterElizabeth City, NC
- Sentara Norfolk General HospitalNorfolk, VA
- Sentara Virginia Beach General HospitalVirginia Beach, VA
- The Outer Banks Hospital, IncNags Head, NC
- Vidant Roanoke Chowan HospitalAhoskie, NC
Other facilities
- Davita Ahoskie DialysisDialysis facility · Ahoskie, NC
- Davita Albermarle DialysisDialysis facility · Elizabeth City, NC
- Davita Elizabeth City DialysisDialysis facility · Elizabeth City, NC
- Fmc Dare County DialysisDialysis facility · Manteo, NC
- Fresenius Medical Care East Northampton CountyDialysis facility · Conway, NC
- Adoration Home Health and HospiceHome health agency · Nags Head, NC
- Albemarle Home Care and HospiceHome health agency · Elizabeth City, NC
- Sentara Home Care ServicesHome health agency · Elizabeth City, NC
Industry payments (Open Payments)
- 2025$527.79 · 27 payments from 10 companies
- 2024$500.63 · 26 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $158.76 | 10 |
| Ardelyx, Inc. | $134.33 | 6 |
| Novo Nordisk Inc | $64.15 | 3 |
| Otsuka America Pharmaceutical, Inc. | $50.59 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $28.10 | 1 |
What the 2025 payments were for
- Food and Beverage$527.79 · 27 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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