Mark William Chandler, MD
NPI 1407291941ActiveIndividual· Internal Medicine· Durham, NC
Internal Medicine (MD) in Durham, North Carolina, trained at University of Oklahoma College of Medicine (class of 2013). Mostly services rather than prescriptions: Medicare paid $14,648 for 58 patients in 2024, with only 32 Part D claims. Teva Pharmaceuticals USA, Inc. was the largest of 2 companies reporting payments in 2025, $64.62 in all, mostly food and beverage.
Overview
| NPI | 1407291941 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | May 9, 2013 |
| Last updated in NPPES | Aug 31, 2020 |
| Certified by provider | Aug 31, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 2016-02429 | 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 | 58 |
|---|---|
| Services billed | 183 across 7 procedure codes |
| Paid by Medicare | $14,648 |
Part D prescriptions in 2024
| Prescriptions (claims) | 32 · 38 30-day fills |
|---|---|
| Patients | 12 |
| Total drug cost | $8,310 |
| Generic share | 84% of claims |
Education and affiliations
| Medical school | University of Oklahoma College of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Internal Medicine |
Medical group
- Duke Health Integrated Practice, IncDurham, NC · 3,185 clinicians
Industry payments (Open Payments)
- 2025$64.62 · 4 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Teva Pharmaceuticals USA, Inc. | $50.46 | 3 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $14.16 | 1 |
What the 2025 payments were for
- Food and Beverage$64.62 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 417 internal medicine physicians in Durham · All internal medicine physicians in North Carolina