May Shu Chen, MD
NPI 1881772887ActiveIndividual· Internal Medicine, Nephrology· Mission Viejo, CA
Internal Medicine, Nephrology (MD) in Mission Viejo, California, trained at University of Chicago, Pritzker School of Medicine (class of 1992). In 2024 Medicare paid $171,966 for 429 patients, and Part D covered 1,501 of their prescriptions, 87% of them generic. Ardelyx, Inc. was the largest of 14 companies reporting payments in 2025, $1,065 in all, mostly food and beverage.
Overview
| NPI | 1881772887 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 1, 2006 |
| Last updated in NPPES | Jan 23, 2013 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | G78591 | 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 - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 429 |
|---|---|
| Services billed | 1,648 across 43 procedure codes |
| Paid by Medicare | $171,966 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,501 · 3,193 30-day fills |
|---|---|
| Patients | 219 |
| Total drug cost | $147,512 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliations
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
- Providence Mission HospitalMission Viejo, CA
Other facilities
- Davita Costa Mesa DialysisDialysis facility · Costa Mesa, CA
- Davita Mission Viejo DialysisDialysis facility · Mission Viejo, CA
- Davita Saddleback DialysisDialysis facility · Laguna Hills, CA
- Davita San Juan Capistrano South DialysisDialysis facility · San Juan Capistrano, CA
Industry payments (Open Payments)
- 2025$1,065 · 41 payments from 14 companies
- 2024$999.04 · 43 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Ardelyx, Inc. | $165.65 | 6 |
| Vifor Pharma, Inc. | $155.81 | 6 |
| Otsuka America Pharmaceutical, Inc. | $126.56 | 5 |
| Sanofi-Aventis U.S. LLC | $121.82 | 1 |
| Novartis Pharmaceuticals Corporation | $120.18 | 5 |
What the 2025 payments were for
- Food and Beverage$1,065 · 41 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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