Christopher Duong Bui, MD
NPI 1811061468ActiveIndividual· Internal Medicine, Gastroenterology· Santa Ana, CA
Internal Medicine, Gastroenterology (MD) in Santa Ana, California, licensed in CA, with an NPI issued in November 2006. Their prescriptions cost Medicare Part D more than their services did: $6,153,194 for 12,234 claims, against $215,873 paid for services in 2024. Gilead Sciences, Inc. was the largest of 20 companies reporting payments in 2025, $14,408 in all, mostly speaking and faculty fees. Lists Memorialcare Orange Coast Medical Center and 1 other hospital as hospital affiliations.
Overview
| NPI | 1811061468 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Nov 17, 2006 |
| Last updated in NPPES | Apr 3, 2014 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A49625 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 973 |
|---|---|
| Services billed | 1,996 across 16 procedure codes |
| Paid by Medicare | $215,873 |
Part D prescriptions in 2024
| Prescriptions (claims) | 12,234 · 15,955 30-day fills |
|---|---|
| Patients | 1,401 |
| Total drug cost | $6,153,194 |
| Generic share | 62% of claims |
Education and affiliations
| Graduation year | 1982 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Gastroenterology |
Hospital affiliations
- Memorialcare Orange Coast Medical CenterFountain Valley, CA
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$14,408 · 153 payments from 20 companies
- 2024$18,610 · 127 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $6,241 | 17 |
| Abbvie Inc. | $4,383 | 20 |
| Aimmune Therapeutics, Inc. | $909.07 | 39 |
| Ardelyx, Inc. | $402.96 | 20 |
| Stryker Corporation | $362.21 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$9,660 · 4 payments
- Food and Beverage$4,385 · 148 payments
- Travel and Lodging$362.21 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other gastroenterologists in Santa Ana
- 1609194703
- 1902952690
- 1932133667
- 1487923207
- 1588766455
- 1689731309
- 1932578028