Robert Fan Yang Tzeng, MD
NPI 1578665014ActiveIndividual· Internal Medicine· Monterey Park, CA
Internal Medicine (MD) with Health Alliance Medical Group, practicing in Monterey Park, California. Their prescriptions cost Medicare Part D more than their services did: $1,149,120 for 10,627 claims, against $110,567 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 18 companies reporting payments in 2025, $1,380 in all, mostly food and beverage.
Overview
| NPI | 1578665014 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Sep 4, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A39498 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 247 |
|---|---|
| Services billed | 1,628 across 20 procedure codes |
| Paid by Medicare | $110,567 |
Part D prescriptions in 2024
| Prescriptions (claims) | 10,627 · 22,384 30-day fills |
|---|---|
| Patients | 648 |
| Total drug cost | $1,149,120 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 1978 |
|---|---|
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Health Alliance Medical GroupHacienda Heights, CA · 2 clinicians
Other facilities
- Happy Home Health ServicesHome health agency · Arcadia, CA
Industry payments (Open Payments)
- 2025$1,380 · 54 payments from 18 companies
- 2024$1,399 · 62 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $276.84 | 16 |
| Sanofi-Aventis U.S. LLC | $153.30 | 1 |
| Gilead Sciences, Inc. | $125.00 | 1 |
| Glaxosmithkline, LLC. | $118.93 | 5 |
| Dexcom, Inc. | $109.36 | 6 |
What the 2025 payments were for
- Food and Beverage$1,380 · 54 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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