Ann M. Chen, MD
NPI 1003840307ActiveIndividual· Internal Medicine, Gastroenterology· Stanford, CA
Internal Medicine, Gastroenterology (MD) in Stanford, California, trained at Albert Einstein College of Medicine of Yeshiva University (class of 2000). In 2024 Medicare paid $16,747 for 112 patients, and Part D covered 138 of their prescriptions, 83% of them generic.
Overview
| NPI | 1003840307 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 10, 2006 |
| Last updated in NPPES | Jan 10, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A76890 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 112 |
|---|---|
| Services billed | 188 across 29 procedure codes |
| Paid by Medicare | $16,747 |
Part D prescriptions in 2024
| Prescriptions (claims) | 138 · 182 30-day fills |
|---|---|
| Patients | 35 |
| Total drug cost | $7,859 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | Albert Einstein College of Medicine of Yeshiva University |
|---|---|
| Graduation year | 2000 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- County of Santa ClaraSan Jose, CA · 1,022 clinicians
Hospital affiliation
- Santa Clara Valley Medical CenterSan Jose, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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