Charles Tuan-Tu Song Nguyen, MD
NPI 1942380118ActiveIndividual· Psychiatry & Neurology, Psychiatry· Irvine, CA
Psychiatry & Neurology, Psychiatry (MD) in Irvine, California, trained at Irvine California College of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $1,466,093 for 6,113 claims, against $132,547 paid for services in 2024. Neurocrine Biosciences, Inc. was the largest of 13 companies reporting payments in 2025, $580,474 in all, mostly speaking and faculty fees.
Overview
| NPI | 1942380118 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Oct 16, 2006 |
| Last updated in NPPES | Apr 7, 2025 |
| Certified by provider | Apr 7, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | 000000A69542 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Psychiatry (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 132 |
|---|---|
| Services billed | 2,215 across 19 procedure codes |
| Paid by Medicare | $132,547 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,113 · 6,304 30-day fills |
|---|---|
| Patients | 188 |
| Total drug cost | $1,466,093 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | Irvine California College of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Psychiatry |
| Secondary specialties | Neuropsychiatry |
Medical groups
- Oc Geropsychiatric Medical GroupDana Point, CA · 5 clinicians
- Pacific Health Education Cognitive Center IncBakersfield, CA · 2 clinicians
- Mind Space Mental Health IncLaguna Beach, CA · 2 clinicians
Industry payments (Open Payments)
- 2025$580,474 · 715 payments from 13 companies
- 2024$513,938 · 640 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Neurocrine Biosciences, Inc. | $154,059 | 162 |
| Otsuka America Pharmaceutical, Inc. | $152,531 | 193 |
| Axsome Therapeutics, Inc. | $119,920 | 149 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $113,072 | 136 |
| E.R. Squibb & Sons, L.L.C. | $39,792 | 53 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$372,547 · 104 payments
- Honoraria$101,109 · 24 payments
- Travel and Lodging$58,158 · 347 payments
- Consulting Fee$33,712 · 7 payments
- Food and Beverage$14,948 · 233 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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