Tam K. Nguyen, M.D.
Internal Medicine (M.D.) in Garden Grove, California, trained at Tulane University School of Medicine (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $4,325,061 for 7,125 claims, against $108,157 paid for services in 2024. Regeneron Healthcare Solutions, Inc. reported $16.03 in payments in 2025, mostly food and beverage. A record with the same name and state is on the OIG exclusion list; it carries no NPI, so check it before acting.
Overview
| NPI | 1720153182 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Nov 21, 2006 |
| Last updated in NPPES | Apr 22, 2023 |
| Certified by provider | Apr 22, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A55848 | CA |
Exclusion screening
Possible match: verify before acting. The OIG list has a record with the same name in California, but that record carries no NPI, so it may be a different person or business.
| Matched by | Name on OIG list | Exclusion type | Excluded since | Location |
|---|---|---|---|---|
| Name + state | Tam Van Nguyen · Chiropractic | 1128a3 | Jul 19, 2012 | Westminster, CA |
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | Possible (name) | See above |
| 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 126 |
|---|---|
| Services billed | 1,344 across 16 procedure codes |
| Paid by Medicare | $108,157 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,125 · 9,526 30-day fills |
|---|---|
| Patients | 270 |
| Total drug cost | $4,325,061 |
| Generic share | 68% of claims |
Education and affiliations
| Medical school | Tulane University School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Other facilities
- Abundant Grace Home Health Services, IncHome health agency · San Dimas, CA
- Advantage Health SystemsHome health agency · Costa Mesa, CA
- Delta Health Services IncHome health agency · Fountain Valley, CA
- Focus Home Health IncHome health agency · Garden Grove, CA
- Master Home Health, Inc.Home health agency · Garden Grove, CA
- Rize HospiceHospice · Anaheim, CA
Industry payments (Open Payments)
- 2025$16.03 · 1 payment from 1 company
- 2024$178.32 · 7 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Regeneron Healthcare Solutions, Inc. | $16.03 | 1 |
What the 2025 payments were for
- Food and Beverage$16.03 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 67 internal medicine physicians in Garden Grove · All internal medicine physicians in California