Dat Q. Nguyen, MD
Internal Medicine (MD) in Hawthorne, California, trained at Icahn School of Medicine at Mount Sinai (class of 1992). Their prescriptions cost Medicare Part D more than their services did: $474,216 for 6,622 claims, against $294,904 paid for services in 2024. Amgen Inc. reported $27.19 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 | 1720092315 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 28, 2006 |
| Last updated in NPPES | Dec 21, 2011 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G77541 | 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 | Dat Tat Nguyen · Business Manager | 1128a1 | Jul 20, 1999 | San Diego, 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 | 473 |
|---|---|
| Services billed | 4,140 across 28 procedure codes |
| Paid by Medicare | $294,904 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,622 · 7,027 30-day fills |
|---|---|
| Patients | 490 |
| Total drug cost | $474,216 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | Icahn School of Medicine at Mount Sinai |
|---|---|
| Graduation year | 1992 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Bolsa Medical GroupWestminster, CA · 14 clinicians
- Ted Medical Group IncGarden Grove, CA · 2 clinicians
Hospital affiliations
- Garden Grove Hospital & Medical CenterGarden Grove, CA
- Huntington Beach HospitalHuntington Beach, CA
- Memorialcare Orange Coast Medical CenterFountain Valley, CA
- Uci Health-OrangeOrange, CA
Other facilities
- 24/7 Care at Home - Home HealthHome health agency · Westminster, CA
- Excellence Home Health Care Agency IncHome health agency · Chino, CA
- Alta Gardens Care CenterNursing home · Garden Grove, CA
- Fountain Valley Post AcuteNursing home · Fountain Valley, CA
- Garden Grove Post AcuteNursing home · Garden Grove, CA
- Garden Park Care CenterNursing home · Garden Grove, CA
- Mission Palms Healthcare CenterNursing home · Westminster, CA
Industry payments (Open Payments)
- 2025$27.19 · 1 payment from 1 company
- 2024$42.47 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $27.19 | 1 |
What the 2025 payments were for
- Food and Beverage$27.19 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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