Michael Uy Yap, M.D.
NPI 1588847362ActiveIndividual· Internal Medicine, Nephrology· Orange, CA
Internal Medicine, Nephrology (M.D.) in Orange, California, licensed in CA, with an NPI issued in December 2007. Their prescriptions cost Medicare Part D more than their services did: $311,609 for 425 claims, against $149,331 paid for services in 2024. Opko Pharmaceuticals, LLC reported $14.03 in payments in 2025, mostly food and beverage. Lists Providence St. Joseph Hospital and 1 other hospital as hospital affiliations.
Overview
| NPI | 1588847362 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Dec 14, 2007 |
| Last updated in NPPES | Sep 4, 2023 |
| Certified by provider | Sep 4, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A110518 | 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 - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 178 |
|---|---|
| Services billed | 1,347 across 12 procedure codes |
| Paid by Medicare | $149,331 |
Part D prescriptions in 2024
| Prescriptions (claims) | 425 · 759 30-day fills |
|---|---|
| Patients | 79 |
| Total drug cost | $311,609 |
| Generic share | 77% of claims |
Education and affiliations
| Graduation year | 2007 |
|---|---|
| Medicare specialty | Nephrology |
Hospital affiliations
- Providence St. Joseph HospitalOrange, CA
- Uci Health-OrangeOrange, CA
Other facilities
- Davita Mainplace Dialysis CenterDialysis facility · Orange, CA
Industry payments (Open Payments)
- 2025$14.03 · 1 payment from 1 company
- 2024$102.04 · 5 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Opko Pharmaceuticals, LLC | $14.03 | 1 |
What the 2025 payments were for
- Food and Beverage$14.03 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other nephrologists in Orange
- 1043442379
- 1104053024
- 1194924100
- 1306022678
- 1326086695
- 1396846317
- 1477623635
- 1487846481
- 1518150283
- 1760475701
- 1831458827
- 1851735211
All 40 nephrologists in Orange · All nephrologists in California