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DR. CHARLES TUAN-TU SONG NGUYEN MD
NPI 1942380118
Psychiatry & Neurology - Psychiatry in Irvine, CA

Active since October 16, 2006PECOS EnrolledAccepts Medicare Assignment
3 SALTON, IRVINE, CA 92602(909) 610-9524(909) 367-2922 Get Directions Write a Review

NPPES record last updated: April 7, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Charles Tuan-tu Song Nguyen Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. CHARLES TUAN-TU SONG NGUYEN MD (NPI 1942380118) is an individual psychiatry provider in Irvine, California, licensed in California (000000A69542) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, maintains a secondary practice location in Long Beach, and is a graduate of Irvine California College Of Medicine (1998).

NPPES Registry Identity

NPI1942380118
Entity TypeIndividualMale
Primary Taxonomy2084P0800X
Provider Legal NameDR. CHARLES TUAN-TU SONG NGUYENCredential: MD
Location Address3 SALTONIrvine, CA 92602-2425
Mailing Address5901 E 7th StLong Beach, CA 90822-5201 · (562) 826-8000
Phone(909) 610-9524
Fax(909) 367-2922
Sole ProprietorNo
Medical School CMSIrvine California College Of MedicineGraduated 1998
Enumeration DateOctober 16, 2006
Last NPPES UpdateApril 7, 2025
NPPES CertifiedApril 7, 2025
✔ NPI 1942380118 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0800X
License✔ Licensed in CA · 000000A69542
Definition
A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.
3 SALTON, Irvine, CA 92602
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Secondary Practice Location 1

Location 15901 E 7th StLong Beach, CA 90822-5201 · Phone (562) 826-8000

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Charles Tuan-tu Song Nguyen Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4688607906
PECOS Enrollment IDI20050915001194
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

4

Medicare enrollment records show Charles Tuan-tu Nguyen reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Central City Community Health Center Inc
13 mi
Federally Qualified Health Center (FQHC)
1814 W LINCOLN AVE
Anaheim, CA 92801
  • Reassigned Medicare billing, California enrollment
  • 91 clinicians in this Medicare group
NPI 1144842014 (714) 805-7719
Mind Space Mental Health Inc
15 mi
Psychiatry
31852 COAST HWY STE 400
Laguna Beach, CA 92651
  • Reassigned Medicare billing, California enrollment
  • 5 clinicians in this Medicare group
NPI 1720800667 (949) 689-9754
Oc Geropsychiatric Medical Group
26 mi
Geriatric Psychiatry
6000 CAMINO REAL, SUITE B
Jurupa Valley, CA 92509
  • Reassigned Medicare billing, California enrollment
  • 7 clinicians in this Medicare group
NPI 1548003015 (714) 487-9724
Pacific Health Education Cognitive Center, Inc
135 mi
Mental Health (Including Community Mental Health Center)
5300 CALIFORNIA AVE STE 300&400
Bakersfield, CA 93309
  • Reassigned Medicare billing, California enrollment
  • 6 clinicians in this Medicare group
NPI 1487121133 (661) 282-9027

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 9

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Psychotherapy, 30 minutes 90832
Psychotherapy is a therapeutic interaction or treatment between a trained professional and a patient. In a 30-minute session, the therapist helps you explore feelings, thoughts, and behaviors to better understand yourself and manage life's challenges.
760 services52 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
318 services66 patients
Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional 99211
This service involves an outpatient visit for established patients who may not need direct interaction with a healthcare professional. It could include reviewing test results, monitoring existing conditions, or adjusting treatment plans. It's typically done remotely, ensuring your comfort and convenience.
308 services48 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
303 services52 patients
Assessment of health behavior 96156
Assessment of health behavior is a process where your daily habits and lifestyle choices are evaluated. This includes your diet, exercise, sleep patterns, and stress management. The goal is to identify areas for improvement and develop strategies for healthier habits.
216 services51 patients
Detection test by immunoassay with direct visual observation for severe acute respiratory syndrome coronavirus 2 (covid-19) 87811
This is a test to detect COVID-19, the virus causing severe respiratory illness. It uses a method called immunoassay, which identifies the virus by its unique proteins. The test is directly observed for accuracy. It helps determine if you're currently infected.
174 services40 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 92602 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$187.60 typical visit price
range $62.96 – $187.60
Typical copayment $46.90 (range $15.74 – $46.90)
Most-billed visit code 99205
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Charles Tuan-tu Nguyen's NPI number?

The NPI number for Charles Tuan-tu Nguyen is 1942380118. It was assigned to this individual provider in the NPPES registry on October 16, 2006.

Where is Charles Tuan-tu Nguyen located?

Charles Tuan-tu Nguyen practices at 3 Salton, Irvine, CA 92602. The listed phone number is (909) 610-9524.

What is Charles Tuan-tu Nguyen's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Charles Tuan-tu Nguyen enrolled in Medicare?

Yes. Charles Tuan-tu Nguyen is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Charles Tuan-tu Nguyen's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Charles Tuan-tu Nguyen reassigns Medicare benefits to 4 organizations: Central City Community Health Center Inc (Anaheim, CA), Mind Space Mental Health Inc (Laguna Beach, CA), Oc Geropsychiatric Medical Group (Jurupa Valley, CA) and Pacific Health Education Cognitive Center, Inc (Bakersfield, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Charles Tuan-tu Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Charles Tuan-tu Nguyen was last updated on April 7, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.