Psychiatry · Irvine, CA
NPI
1942380118
Since 2006
Specialty
Psychiatry
Code 2084P0800X
Group practices
4
Medicare group memberships
Hospitals
0
Hospital affiliations
3 Salton
Irvine, CA, 92602
Phone (909) 610-9524
Groups this clinician bills Medicare through
Medicare paid, 2024
$133K
2,215 services
Medicare patients, 2024
132
Average age 63
Drug cost, 2024
$1.5M
6,113 prescriptions
Company payments, 2025
$580K
From 13 companies
Procedures and visits billed to Original Medicare, 2024
In 2024, the most common Medicare service billed by Charles Tuan-Tu S Nguyen was code 90832 (psychotherapy - nongroup), 760 times for 52 patients. In total Charles Tuan-Tu S Nguyen billed 2,215 services in 19 codes, and Medicare paid $133K.
| Code |
|---|
Official US government data: the national provider registry and Medicare enrollment records, linked by NPI. Last update of this record: 2025-04-07.
| Setting |
|---|
| Services |
|---|
| Patients |
|---|
| Paid per service |
|---|
| Medicare paid |
|---|
| 90832 Psychotherapy - Nongroup | Office | 760 | 52 | $54.44 | $41K |
| 99232 Hospital E&M - Subsequent | Facility | 318 | 66 | $64.86 | $21K |
| 99211 Office E&M - Established | Office | 308 | 48 | $19.48 | $6,001 |
| 99214 Office E&M - Established | Office | 303 | 52 | $97.78 | $30K |
| 96156 Behavioral Health Services | Office | 216 | 51 | $77.77 | $17K |
| 87811 Immunoassay | Office | 174 | 40 | $40.17 | $6,990 |
| 99222 Hospital E&M - Initial | Facility | 37 | 32 | $107.47 | $3,976 |
| 99493 Behavioral Health Services | Facility | 26 | 20 | $56.34 | $1,465 |
| 90834 Psychotherapy - Nongroup | Office | 13 | 11 | $66.64 | $866 |
By year: 2023 $74K for 1,854 services; 2024 $133K for 2,215 services.
Lab tests billed to Medicare, 2024
| Test code | Tests | Patients | Paid per test | Medicare paid |
|---|---|---|---|---|
| 87811 Immunoassay | 174 | 40 | $40.17 | $6,990 |
Medicare prescription drug claims, 2024
In 2024, the drug Charles Tuan-Tu S Nguyen prescribed most often to Medicare patients was Quetiapine Fumarate, with 521 prescriptions and refills. In total Charles Tuan-Tu S Nguyen wrote 6,113 Medicare prescriptions that cost $1.5M.
| Drug | Claims | 30-day fills | Patients | Cost |
|---|---|---|---|---|
| Quetiapine Fumarate Generic | 521 | 526 | 47 | $7,422 |
| Trazodone Hcl Generic | 458 | 464 | 53 | $3,220 |
| Olanzapine Generic | 449 | 458 | 48 | $5,709 |
| Risperidone Generic | 434 | 439 | 40 | $5,101 |
| Divalproex Sodium Generic | 363 | 370 | 31 | $15K |
| Benztropine Mesylate Generic | 320 | 337 | 34 | $3,963 |
| Clonazepam Generic | 266 | 273 | 28 | $1,777 |
| Sertraline Hcl Generic | 246 | 248 | 27 | $2,320 |
| Lorazepam Generic | 191 | 191 | 18 | $1,054 |
| Aripiprazole Generic | 177 | 177 | 23 | $8,538 |
| Mirtazapine Generic | 154 | 163 | 19 | $941 |
| Fluoxetine Hcl Generic | 152 | 154 | 14 | $822 |
| Divalproex Sodium Er Divalproex Sodium | 150 | 152 | 16 | $6,137 |
| Haloperidol Generic | 150 | 155 | 12 | $6,612 |
| Gabapentin Generic | 129 | 130 | 15 | $1,710 |
Brand drugs: 408 claims; generic drugs: 5,705 claims.
Money and other things of value reported by the companies
In 2025, drug and medical device companies paid Charles Tuan-Tu S Nguyen $580K ($580K in general payments such as food, travel and fees) from 13 companies. The largest payer was Neurocrine BioSciences, Inc. with $154K.
| Company | Payments | Amount |
|---|---|---|
| Neurocrine BioSciences, Inc. NBIX | 162 | $154K |
| Otsuka America Pharmaceutical, Inc. 4578.T | 193 | $153K |
| Axsome Therapeutics, Inc. AXSM | 149 | $120K |
| ITI, Inc. (d/b/a Intra-Cellular Therapies, Inc.) JNJ | 136 | $113K |
| E.R. Squibb & Sons, L.L.C. BMY | 53 | $40K |
| Alkermes, Inc. ALKS | 9 | $511 |
| Otsuka Pharmaceutical Development & Commercialization, Inc. 4578.T | 5 | $380 |
| Teva Pharmaceuticals USA, Inc. TEVA | 2 | $74.53 |
| Lundbeck LLC | 2 | $46.64 |
| Abbvie Inc. ABBV | 1 | $31.03 |
Official US government data on Original Medicare services, Medicare prescription drug plans and the payments drug and device companies must report. Services with fewer than 11 patients and drugs with fewer than 11 claims are not published. Procedure codes are shown by number with their public category.