Dr. Charles Tuan-Tu Nguyen, MD
What this data tells you about Dr. Nguyen
Dr. Charles Tuan-Tu Nguyen is a psychiatry specialist in Irvine, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Nguyen performed 1,807 Medicare services across 268 unique beneficiaries.
Between the years covered by Open Payments, Dr. Nguyen received a total of $1,725,768 from 25 pharmaceutical and/or device companies across 2540 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in psychiatry. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Nguyen is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Office visit for established patient An office visit for an existing patient that may not require the healthcare professional to be present. |
693 | $19 | $40 |
| COVID-19 immunoassay detection test A laboratory test that uses an immunoassay method to detect the presence of severe acute respiratory syndrome coronavirus 2 (COVID-19) through direct visual observation. |
652 | $41 | $70 |
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
175 | $66 | $100 |
| Psychotherapy, 30 minutes A 30-minute session of psychotherapy involving talk therapy to address mental health concerns. |
145 | $48 | $61 |
| Health behavior assessment An evaluation of a patient's health-related behaviors and lifestyle factors. This process helps identify habits that may impact overall well-being. |
74 | $77 | $150 |
| Psychiatric collaborative care follow-up, first 60 minutes A follow-up psychiatric care management visit for subsequent calendar months. The service covers the first 60 minutes of collaborative care coordination. |
27 | $82 | $265 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
26 | $109 | $150 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
15 | $91 | $137 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
All-time payments by company (2018-2024) ›
Associated products mentioned in payments ›
The majority of payments (94%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in psychiatry and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 0% for psychiatry in CA.
Geographic Context
3.6 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Nguyen is a clinical cardiology specialist, with above-average Medicare volume (top 7% in CA), with speaking/promotional industry engagement in the top 0% of CA peers, with 19 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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