Diana K. Yao, M.D.
NPI 1588678833ActiveIndividual· Specialist· Long Beach, CA
Specialist (M.D.) in Long Beach, California, trained at George Washington University School of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $148,462 for 698 claims, against $84,519 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 16 companies reporting payments in 2025, $1,589 in all, mostly food and beverage.
Overview
| NPI | 1588678833 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 29, 2006 |
| Last updated in NPPES | Jan 10, 2022 |
| Certified by provider | Jan 10, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | G73884 | 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 | 479 |
|---|---|
| Services billed | 757 across 20 procedure codes |
| Paid by Medicare | $84,519 |
Part D prescriptions in 2024
| Prescriptions (claims) | 698 · 1,661 30-day fills |
|---|---|
| Patients | 231 |
| Total drug cost | $148,462 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | George Washington University School of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- United Medical DoctorsMurrieta, CA · 173 clinicians
Hospital affiliation
- Memorialcare Long Beach Medical CenterLong Beach, CA
Industry payments (Open Payments)
- 2025$1,589 · 55 payments from 16 companies
- 2024$1,511 · 55 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $475.61 | 14 |
| Abbvie Inc. | $237.84 | 12 |
| Medtronic, Inc. | $142.85 | 1 |
| Genzyme Corporation | $126.12 | 4 |
| Janssen Biotech, Inc. | $124.10 | 5 |
What the 2025 payments were for
- Food and Beverage$1,589 · 55 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 160 Specialist providers in Long Beach · All Specialist providers in California