Charles A. Duncan, MD
NPI 1215932462ActiveIndividual· Internal Medicine, Pulmonary Disease· San Antonio, TX
Internal Medicine, Pulmonary Disease (MD) in San Antonio, Texas, trained at Medical College of Georgia School of Medicine (class of 1977). Their prescriptions cost Medicare Part D more than their services did: $606,967 for 1,331 claims, against $39,797 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 21 companies reporting payments in 2025, $2,222 in all, mostly food and beverage.
Overview
| NPI | 1215932462 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 15, 2005 |
| Last updated in NPPES | Aug 12, 2025 |
| Certified by provider | Aug 12, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | H2115 | TX |
| Internal Medicine, Critical Care Medicine | 207RC0200X | H2115 | TX |
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 - Critical Care (Intensivists) (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 235 |
|---|---|
| Services billed | 816 across 20 procedure codes |
| Paid by Medicare | $39,797 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,331 · 1,747 30-day fills |
|---|---|
| Patients | 240 |
| Total drug cost | $606,967 |
| Generic share | 45% of claims |
Education and affiliations
| Medical school | Medical College of Georgia School of Medicine |
|---|---|
| Graduation year | 1977 |
| Medicare specialty | Critical Care (Intensivists) |
| Secondary specialties | Pulmonary Disease |
| Telehealth | Offers telehealth |
Medical group
- Pulmonary Consultants of San Antonio PASan Antonio, TX · 9 clinicians
Industry payments (Open Payments)
- 2025$2,222 · 110 payments from 21 companies
- 2024$1,972 · 108 payments from 23 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $296.95 | 18 |
| Astrazeneca Pharmaceuticals LP | $279.91 | 15 |
| United Therapeutics Corporation | $271.02 | 11 |
| Insmed, Inc. | $213.40 | 14 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $140.27 | 6 |
What the 2025 payments were for
- Food and Beverage$2,222 · 110 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 135 pulmonologists in San Antonio · All pulmonologists in Texas