Louis Toan Thien Nguyen
Emergency Medicine Physician · Los Angeles, CA
Louis Toan Thien Nguyen is an emergency medicine physician with a practice address in Los Angeles, California, and NPI 1528646544, issued on Mar 31, 2021. Check the license (California A197655, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Louis Toan Thien Nguyen
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A197655 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 N State St Ste A7D, Los Angeles, CA 90089
- Phone
- (323) 409-7053
- Enumerated
- Mar 31, 2021
- Record last updated
- Feb 21, 2025
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1200 N State St Ste A7D
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eric Abedi, MDStudent in an Organized Health Care Education/Training Program1750182994
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- Chijioke Akunwafo, MDStudent in an Organized Health Care Education/Training Program1093417784
- April Alcantara, MDStudent in an Organized Health Care Education/Training Program1518669175
- Emilie Allaert, MDStudent in an Organized Health Care Education/Training Program1922809870
Verify Louis Toan Thien Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A197655Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average emergency medicine physician in 2024
43 Medicare Part D claims for 35 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Louis Toan Thien Nguyen among 7,751 emergency medicine physician records in California
Louis Toan Thien Nguyen is one of 7,751 emergency medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 92% of them.
- NPI issued2021 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in Los Angeles → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Robert AllenLos Angeles, CA 900891528562469
- Eduardo Borquez, M.D.Los Angeles, CA 900891497935134
- Joseph Choi, MD, MPHLos Angeles, CA 900891902087497
- David Diller, M.D.Los Angeles, CA 900891801187398
- Dennis Espitia, M.D.Los Angeles, CA 900891669654380
- David Harrison, M.D.Los Angeles, CA 900891104189000
- Jennifer Huang, D.O.Los Angeles, CA 900891275708588
- Vanessa Kreger, M.D.Los Angeles, CA 900891467849604
Common questions
What is Louis Toan Thien Nguyen's NPI number?
Louis Toan Thien Nguyen's National Provider Identifier (NPI) is 1528646544, issued on Mar 31, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Louis Toan Thien Nguyen located?
The NPPES record lists a practice address at 1200 N State St Ste A7D, Los Angeles, CA, 90089. Phone: (323) 409-7053. Providers update this record themselves, so call before visiting.
How can I verify Louis Toan Thien Nguyen's license?
NPPES lists California license number A197655, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Louis Toan Thien Nguyen prescribe under Medicare Part D?
In 2024, Louis Toan Thien Nguyen had 43 Medicare Part D claims for 35 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.