William C. Lopez, M.D.
NPI 1013998228ActiveIndividual· Internal Medicine, Gastroenterology· Birmingham, AL
Internal Medicine, Gastroenterology (M.D.) in Birmingham, Alabama, trained at University of Alabama School of Medicine (class of 1982). Their prescriptions cost Medicare Part D more than their services did: $748,216 for 1,540 claims, against $48,761 paid for services in 2024. Salix Pharmaceuticals, A Division of Bausch Health US, LLC was the largest of 17 companies reporting payments in 2025, $1,509 in all, mostly food and beverage.
Overview
| NPI | 1013998228 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 7, 2005 |
| Last updated in NPPES | Oct 5, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 1088 | AL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Gastroenterology (AL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 270 |
|---|---|
| Services billed | 543 across 41 procedure codes |
| Paid by Medicare | $48,761 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,540 · 1,975 30-day fills |
|---|---|
| Patients | 713 |
| Total drug cost | $748,216 |
| Generic share | 70% of claims |
Education and affiliations
| Medical school | University of Alabama School of Medicine |
|---|---|
| Graduation year | 1982 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Gastroenterology Associates of North-Central Alabama IncBirmingham, AL · 94 clinicians
Hospital affiliations
- St Vincents BlountOneonta, AL
- St. Vincent's EastBirmingham, AL
Industry payments (Open Payments)
- 2025$1,509 · 77 payments from 17 companies
- 2024$1,768 · 85 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Salix Pharmaceuticals, A Division of Bausch Health US, LLC | $241.45 | 12 |
| Abbvie Inc. | $167.36 | 11 |
| Madrigal Pharmaceuticals | $161.56 | 6 |
| Pfizer Inc. | $151.92 | 9 |
| Aimmune Therapeutics, Inc. | $146.39 | 8 |
What the 2025 payments were for
- Food and Beverage$1,509 · 77 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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