You-Jen Chou, MD
NPI 1104070887ActiveIndividual· Internal Medicine, Gastroenterology· Irvine, CA
Internal Medicine, Gastroenterology (MD) in Irvine, California, trained at Boston University School of Medicine (class of 2008). Their prescriptions cost Medicare Part D more than their services did: $166,789 for 777 claims, against $50,890 paid for services in 2024. Ardelyx, Inc. was the largest of 12 companies reporting payments in 2025, $1,371 in all, mostly food and beverage.
Overview
| NPI | 1104070887 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Nov 8, 2008 |
| Last updated in NPPES | May 5, 2026 |
| Certified by provider | May 5, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A111307 | 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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 203 |
|---|---|
| Services billed | 467 across 33 procedure codes |
| Paid by Medicare | $50,890 |
Part D prescriptions in 2024
| Prescriptions (claims) | 777 · 1,708 30-day fills |
|---|---|
| Patients | 245 |
| Total drug cost | $166,789 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Boston University School of Medicine |
|---|---|
| Graduation year | 2008 |
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
- United Medical DoctorsMurrieta, CA · 173 clinicians
Hospital affiliations
- Hoag Memorial Hospital PresbyterianNewport Beach, CA
- Memorialcare Orange Coast Medical CenterFountain Valley, CA
- Southwest Healthcare Rancho Springs HospitalMurrieta, CA
Industry payments (Open Payments)
- 2025$1,371 · 58 payments from 12 companies
- 2024$1,008 · 40 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $446.45 | 12 |
| Abbvie Inc. | $251.24 | 14 |
| Pfizer Inc. | $154.67 | 8 |
| Celltrion USA Inc. | $142.49 | 6 |
| Phathom Pharmaceuticals, Inc. | $135.44 | 7 |
What the 2025 payments were for
- Food and Beverage$1,371 · 58 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 30 gastroenterologists in Irvine · All gastroenterologists in California