Nicholas Nguyen
Infectious Disease Physician · Santa Ana, CA
Nicholas Nguyen is an infectious disease physician with a practice address in Santa Ana, California, and NPI 1689239584, issued on May 6, 2019. Check the license (California A177150, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nicholas Nguyen
- Primary taxonomy
- Infectious Disease Physician 207RI0200X
- License number
- A177150 CA
Self-reported in NPPES; status is on the state search - Practice location
- 999 N Tustin Ave Ste 109, Santa Ana, CA 92705
- Phone
- (714) 664-0045
- Enumerated
- May 6, 2019
- Record last updated
- Sep 20, 2024
- Fax
- (714) 664-0049
- Medicare enrollment
- Enrolled (PECOS I20241002001014); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest infectious disease physician records → All 1,119 in California → Look up another NPI →
Also registered at 999 N Tustin Ave Ste 109
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Martin Eisner, MDSurgery Physician1770505844
- Marianne Go-Wheeler, M.D.Infectious Disease Physician1740627280
- Roma Patel, M.D.Infectious Disease Physician1740523406
- Jin Sui, MDTrauma Surgery Physician1114411352
Verify Nicholas Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A177150Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average infectious disease physician in 2024
88 Medicare Part D claims for 41 beneficiaries, against an average of 689 among the 7,388 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin-Clavulanate Potass11 claims
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.
Bills Medicare through one group practice
- Infectious Disease Associates OF Orange County IncSanta Ana, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nicholas Nguyen among 1,119 infectious disease physician records in California
Nicholas Nguyen is one of 1,119 infectious disease physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 92% of them.
- NPI issued2019 · 92% of these records are older, 5% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2019 · median 2003 among the 735 with a school on file
- Record last updated2024 · 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 207RI0200X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Infectious Disease Physician providers in California
There are 1,119 infectious disease physician records in California.
All 1,119 in California → Every provider in Santa Ana → Infectious Disease Physician nationwide →
The 8 infectious disease physician records with the nearest ZIP codes
- Puneet Chahal, MDSanta Ana, CA 927051811155476
- Michael Fitzgibbons, MDSanta Ana, CA 927051194727859
- Marianne Go-Wheeler, M.D.Santa Ana, CA 927051740627280
- Roma Patel, M.D.Santa Ana, CA 927051740523406
- Tuan Ta, MDSanta Ana, CA 927051114103124
- Ronald Sherman, MDSanta Ana, CA 927061295903631
- Hon Yu, MDSanta Ana, CA 927041023118486
- Javier Davila, M.D.Fountain Valley, CA 927081548272768
Common questions
What is Nicholas Nguyen's NPI number?
Nicholas Nguyen's National Provider Identifier (NPI) is 1689239584, issued on May 6, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Nicholas Nguyen located?
The NPPES record lists a practice address at 999 N Tustin Ave Ste 109, Santa Ana, CA, 92705. Phone: (714) 664-0045. Providers update this record themselves, so call before visiting.
How can I verify Nicholas Nguyen's license?
NPPES lists California license number A177150, 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 Nicholas Nguyen prescribe under Medicare Part D?
In 2024, Nicholas Nguyen had 88 Medicare Part D claims for 41 beneficiaries; the average among infectious disease physician prescribers was 689. 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.