Alan Chen, M.D.
NPI 1033539945ActiveIndividual· Internal Medicine, Gastroenterology· Torrance, CA
Internal Medicine, Gastroenterology (M.D.) in Torrance, California, trained at Duke University School of Medicine (class of 2014). In 2024 Medicare paid $96,523 for 452 patients, and Part D covered 392 of their prescriptions, 89% of them generic. Ardelyx, Inc. was the largest of 5 companies reporting payments in 2025, $241.03 in all, mostly food and beverage.
Overview
| NPI | 1033539945 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 17, 2014 |
| Last updated in NPPES | Sep 16, 2026 |
| Certified by provider | Sep 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | C207362 | CA |
| Internal Medicine, Gastroenterology | 207RG0100X | D0089536 | MD |
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); Practitioner - Gastroenterology (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 452 |
|---|---|
| Services billed | 723 across 33 procedure codes |
| Paid by Medicare | $96,523 |
Part D prescriptions in 2024
| Prescriptions (claims) | 392 · 855 30-day fills |
|---|---|
| Patients | 140 |
| Total drug cost | $64,431 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | Duke University School of Medicine |
|---|---|
| Graduation year | 2014 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Medstar Medical Group II LLCWashington, DC · 3,767 clinicians
Hospital affiliation
- Medstar Franklin Square Medical CenterRosedale, MD
Industry payments (Open Payments)
- 2025$241.03 · 11 payments from 5 companies
- 2024$256.02 · 8 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $62.24 | 3 |
| Janssen Biotech, Inc. | $60.96 | 3 |
| Pfizer Inc. | $59.01 | 3 |
| Takeda Pharmaceuticals U.S.A., Inc. | $35.92 | 1 |
| Abbvie Inc. | $22.90 | 1 |
What the 2025 payments were for
- Food and Beverage$241.03 · 11 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 58 gastroenterologists in Torrance · All gastroenterologists in California