Dr Theresa Toquyen Nguyen, DO - Medicare Psychiatry & Neurology in Tustin, CA

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Dr Theresa Toquyen Nguyen, DO is a medicare enrolled "Psychiatry & Neurology - Child & Adolescent Psychiatry" physician in Tustin, California. Her current practice location is 15405 Lansdowne Rd, Tustin, California. You can reach out to her office (for appointments etc.) via phone at (925) 997-9093.

Dr Theresa Toquyen Nguyen is licensed to practice in California (license number 20A12682) and she also participates in the medicare program. She does not accept medicare assignments directly but she may accept medicare through third-party (refer to Reassignment section below) and may also prescribe medicare part D drugs. Her NPI Number is 1679884928.

Contact Information

Dr Theresa Toquyen Nguyen, DO
15405 Lansdowne Rd,
Tustin, CA 92782
(925) 997-9093
Not Available

Map and Direction




Physician's Profile

Full NameDr Theresa Toquyen Nguyen
GenderFemale
SpecialityPsychiatry & Neurology - Child & Adolescent Psychiatry
Location15405 Lansdowne Rd, Tustin, California
Accepts Medicare AssignmentsMedicare enrolled and may accept medicare through third-party reassignment. May prescribe medicare part D drugs.
  NPI Data:
  • NPI Number: 1679884928
  • Provider Enumeration Date: 07/01/2010
  • Last Update Date: 06/28/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 0648603233
  • Enrollment ID: I20191212002388

Medical Identifiers

Medical identifiers for Dr Theresa Toquyen Nguyen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1679884928NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
2084P0804XPsychiatry & Neurology - Child & Adolescent Psychiatry 007228 (Arizona)Secondary
2084P0804XPsychiatry & Neurology - Child & Adolescent Psychiatry 20A12682 (California)Primary
2084P0800XPsychiatry & Neurology - Psychiatry 20A12682 (California)Secondary

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Theresa Toquyen Nguyen allows following entities to bill medicare on her behalf.
Entity NameCounty Of Imperial
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1225258841
PECOS PAC ID: 9739166927
Enrollment ID: O20040706000950
Entity NameCounty Of Modoc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1396858668
PECOS PAC ID: 5193987808
Enrollment ID: O20120425000476

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Theresa Toquyen Nguyen is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Theresa Toquyen Nguyen, DO
One Hospital Drive, Dc018.00,
Columbia, MO 65202

Ph: () -		Dr Theresa Toquyen Nguyen, DO
15405 Lansdowne Rd,
Tustin, CA 92782

Ph: (925) 997-9093

Reviews and Comments


Psychiatry & Neurology Doctors in Tustin, CA

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Dr. Amor S. Del Mundo, M.D.
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Madhu K Katakia, MD
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Neil P Butani, MD
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Phone: 714-888-5766    
Dr. Uzma Nasim, M.D
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Practice Location: 18102 Irvine Blvd, Suite 206, Tustin, CA 92780
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Dr. Roderick Dean Ponath, M.D.
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Phone: 415-990-2502    Fax: 415-461-2915

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

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