Christopher P. Nguyen, MD
NPI 1588624100ActiveIndividual· Internal Medicine, Geriatric Medicine· Mission Viejo, CA
Internal Medicine, Geriatric Medicine (MD) with Healthcare Partners Affiliates Medical Group and 1 other group, practicing in Mission Viejo, California. Their prescriptions cost Medicare Part D more than their services did: $1,095,525 for 11,890 claims, against $132,706 paid for services in 2024. Lilly USA, LLC was the largest of 9 companies reporting payments in 2025, $664.09 in all, mostly food and beverage. Lists Memorialcare Long Beach Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1588624100 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Mar 27, 2006 |
| Last updated in NPPES | Jan 16, 2026 |
| Certified by provider | Jan 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Geriatric Medicine Primary | 207RG0300X | A74293 | 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 | 392 |
|---|---|
| Services billed | 1,678 across 41 procedure codes |
| Paid by Medicare | $132,706 |
Part D prescriptions in 2024
| Prescriptions (claims) | 11,890 · 29,878 30-day fills |
|---|---|
| Patients | 932 |
| Total drug cost | $1,095,525 |
| Generic share | 89% of claims |
Education and affiliations
| Graduation year | 2003 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Healthcare Partners Affiliates Medical GroupAnaheim, CA · 754 clinicians
- Memorialcare Medical FoundationLong Beach, CA · 566 clinicians
Hospital affiliations
- Memorialcare Long Beach Medical CenterLong Beach, CA
- Memorialcare Saddleback Medical CenterLaguna Hills, CA
- Uci Health-OrangeOrange, CA
Other facilities
- Salus HospiceHospice · Irvine, CA
Industry payments (Open Payments)
- 2025$664.09 · 32 payments from 9 companies
- 2024$1,145 · 47 payments from 13 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $158.94 | 10 |
| Bayer Healthcare Pharmaceuticals Inc. | $123.83 | 5 |
| Amgen Inc. | $109.84 | 5 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $75.84 | 4 |
| Ucb, Inc. | $46.59 | 1 |
What the 2025 payments were for
- Food and Beverage$664.09 · 32 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records