Loan T. Nguyen, MD
NPI 1346477858ActiveIndividual· Hospitalist· Mission Viejo, CA
Hospitalist (MD) in Mission Viejo, California, trained at St. Louis College of Physicians and Surgeons (class of 2007). 275 Medicare patients in 2024, $69,052 paid; nearly all of their 448 Part D prescriptions were generic (91%). Abbvie Inc. was the largest of 6 companies reporting payments in 2025, $492.67 in all, mostly food and beverage.
Overview
| NPI | 1346477858 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 11, 2009 |
| Last updated in NPPES | Nov 9, 2021 |
| Certified by provider | Nov 9, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Hospitalist Primary | 208M00000X | A106830 | CA |
| Internal Medicine | 207R00000X | A106830 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 275 |
|---|---|
| Services billed | 783 across 14 procedure codes |
| Paid by Medicare | $69,052 |
Part D prescriptions in 2024
| Prescriptions (claims) | 448 · 462 30-day fills |
|---|---|
| Patients | 182 |
| Total drug cost | $22,258 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | St. Louis College of Physicians and Surgeons |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | Internal Medicine |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliation
- Providence Mission HospitalMission Viejo, CA
Industry payments (Open Payments)
- 2025$492.67 · 23 payments from 6 companies
- 2024$472.87 · 20 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $150.26 | 6 |
| Zoll Services LLC (A/K/A Zoll Lifecor Corp) | $144.09 | 9 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $89.87 | 3 |
| Novo Nordisk Inc | $66.84 | 3 |
| Pfizer Inc. | $22.63 | 1 |
What the 2025 payments were for
- Food and Beverage$492.67 · 23 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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