Tam Hoang Nguyen, D.O.
Internal Medicine (D.O.) with Action Therapy Centers Limited, practicing in San Jose, California. Their prescriptions cost Medicare Part D more than their services did: $4,358,809 for 35,628 claims, against $331,628 paid for services in 2024. Abbvie Inc. was the largest of 18 companies reporting payments in 2025, $1,828 in all, mostly food and beverage. Lists Santa Clara Valley Medical Center and 1 other hospital as hospital affiliations. 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 | 1962520478 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Mar 26, 2007 |
| Last updated in NPPES | Sep 12, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 20A9636 | CA |
| Hospitalist | 208M00000X | 20A9636 | 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) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,014 |
|---|---|
| Services billed | 3,862 across 29 procedure codes |
| Paid by Medicare | $331,628 |
Part D prescriptions in 2024
| Prescriptions (claims) | 35,628 · 75,345 30-day fills |
|---|---|
| Patients | 1,755 |
| Total drug cost | $4,358,809 |
| Generic share | 83% of claims |
Education and affiliations
| Graduation year | 2004 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Action Therapy Centers LimitedHouston, TX · 76 clinicians
Hospital affiliations
- Santa Clara Valley Medical CenterSan Jose, CA
- Stanford Health CareStanford, CA
Other facilities
- Ace Home Health Care & Hospice, IncHome health agency · Orinda, CA
- Best Home Health Providers, IncHome health agency · Hayward, CA
- Centerwell Asian American Home HealthHome health agency · Alameda, CA
- Health Link Home Health AgencyHome health agency · San Francisco, CA
- Sequoia Home HealthHome health agency · Milpitas, CA
Industry payments (Open Payments)
- 2025$1,828 · 75 payments from 18 companies
- 2024$1,041 · 49 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $330.99 | 17 |
| Novo Nordisk Inc | $326.26 | 10 |
| Astrazeneca Pharmaceuticals LP | $282.62 | 9 |
| Glaxosmithkline, LLC. | $230.07 | 11 |
| Kowa Pharmaceuticals America, Inc. | $184.29 | 8 |
What the 2025 payments were for
- Food and Beverage$1,828 · 75 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 502 internal medicine physicians in San Jose · All internal medicine physicians in California