Eric Mao, M.D.
NPI 1043503295ActiveIndividual· Internal Medicine, Gastroenterology· Sacramento, CA
Internal Medicine, Gastroenterology (M.D.) in Sacramento, California, trained at Warren Alpert Medical School of Brown University (class of 2011). Their prescriptions cost Medicare Part D more than their services did: $5,934,621 for 706 claims, against $36,208 paid for services in 2024. Janssen Scientific Affairs, LLC reported $112.23 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1043503295 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 20, 2011 |
| Last updated in NPPES | Jan 31, 2022 |
| Certified by provider | Jan 31, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A147641 | CA |
| Internal Medicine, Gastroenterology | 207RG0100X | MD14655 | RI |
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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 195 |
|---|---|
| Services billed | 410 across 31 procedure codes |
| Paid by Medicare | $36,208 |
Part D prescriptions in 2024
| Prescriptions (claims) | 706 · 1,044 30-day fills |
|---|---|
| Patients | 169 |
| Total drug cost | $5,934,621 |
| Generic share | 39% of claims |
Education and affiliations
| Medical school | Warren Alpert Medical School of Brown University |
|---|---|
| Graduation year | 2011 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Regents of the Univ of CaSacramento, CA · 1,584 clinicians
- Regents of the University of CaliforniaSacramento, CA · 567 clinicians
Hospital affiliations
- Sutter Medical Center, SacramentoSacramento, CA
- University of California Davis Medical CenterSacramento, CA
Industry payments (Open Payments)
- 2025$112.23 · 1 payment from 1 company
- 2024$117.45 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Scientific Affairs, LLC | $112.23 | 1 |
What the 2025 payments were for
- Food and Beverage$112.23 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 100 gastroenterologists in Sacramento · All gastroenterologists in California