Brian Fung, MD
NPI 1366974164ActiveIndividual· Internal Medicine, Gastroenterology· Mesa, AZ
Internal Medicine, Gastroenterology (MD) in Mesa, Arizona, trained at University of California, Geffen School of Medicine (class of 2017). Their prescriptions cost Medicare Part D more than their services did: $278,893 for 596 claims, against $55,593 paid for services in 2024. Janssen Biotech, Inc. was the largest of 20 companies reporting payments in 2025, $2,922 in all, mostly food and beverage.
Overview
| NPI | 1366974164 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 30, 2017 |
| Last updated in NPPES | Oct 26, 2023 |
| Certified by provider | Oct 8, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 61850 | AZ |
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 (AZ) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 215 |
|---|---|
| Services billed | 590 across 26 procedure codes |
| Paid by Medicare | $55,593 |
Part D prescriptions in 2024
| Prescriptions (claims) | 596 · 1,109 30-day fills |
|---|---|
| Patients | 275 |
| Total drug cost | $278,893 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 2017 |
| Medicare specialty | Internal Medicine |
Medical group
- Arizona Digestive Health PCSun City, AZ · 136 clinicians
Hospital affiliations
- Banner - University Medical Center PhoenixPhoenix, AZ
- Banner Desert Medical CenterMesa, AZ
Industry payments (Open Payments)
- 2025$2,922 · 158 payments from 20 companies
- 2024$2,251 · 112 payments from 21 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Biotech, Inc. | $569.42 | 30 |
| Ipsen Biopharmaceuticals, Inc | $361.01 | 11 |
| Abbvie Inc. | $353.93 | 16 |
| Pfizer Inc. | $330.11 | 29 |
| Madrigal Pharmaceuticals | $219.80 | 11 |
What the 2025 payments were for
- Food and Beverage$2,823 · 157 payments
- Education$99.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other gastroenterologists in Mesa
- 1003906751
- 1063458735
- 1134202500
- 1174796999
- 1245439223
- 1265813349
- 1275673915
- 1346219433
- 1366437337
- 1528053121
- 1538264684
- 1548370109
All 53 gastroenterologists in Mesa · All gastroenterologists in Arizona