Stephen Huynh-Hai Phan, M.D.
Emergency Medicine Physician · Downey, CA
Stephen Huynh-Hai Phan, M.D. is an emergency medicine physician with a practice address in Downey, California, and NPI 1831397413, issued on Jul 5, 2007. Check the license (California A109908, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Stephen Huynh-Hai Phan
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A109908 CA
Self-reported in NPPES; status is on the state search - Practice location
- 9333 Imperial Hwy, Downey, CA 90242
- Phone
- (562) 657-9000
- Enumerated
- Jul 5, 2007
- Record last updated
- Mar 7, 2023
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 9333 Imperial Hwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Fariba Amini, RCPRegistered Respiratory Therapist1962984302
- Orland AndayaRegistered Respiratory Therapist1598247751
- Michelle Andersen, D.P.T.Physical Therapist1295165231
Verify Stephen Huynh-Hai Phan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A109908Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% fewer Medicare Part D claims than the average emergency medicine physician in 2024
196 Medicare Part D claims for 78 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Prednisone30 claims
- Tamsulosin Hcl17 claims
- Azithromycin15 claims
- Zolpidem Tartrate12 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.
Stephen Huynh-Hai Phan among 7,751 emergency medicine physician records in California
Stephen Huynh-Hai Phan, M.D. 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 50% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2023 · 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 Downey → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Amanda Barrett, M.D.Downey, CA 902421598936841
- Jennifer Blanco, M.D.Downey, CA 902421548520455
- Jennifer ElliceDowney, CA 902421275758237
- Peter Grimes, MDDowney, CA 902421518181866
- Joseph GrubicDowney, CA 902421033405030
- Satjiv Kohli, M.D.Downey, CA 902421316117583
- Daniel Morrad, DODowney, CA 902421477115228
- Denise Muschett, MDDowney, CA 902421295997781
Common questions
What is Stephen Huynh-Hai Phan, M.D.'s NPI number?
Stephen Huynh-Hai Phan, M.D.'s National Provider Identifier (NPI) is 1831397413, issued on Jul 5, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Stephen Huynh-Hai Phan, M.D. located?
The NPPES record lists a practice address at 9333 Imperial Hwy, Downey, CA, 90242. Phone: (562) 657-9000. Providers update this record themselves, so call before visiting.
How can I verify Stephen Huynh-Hai Phan, M.D.'s license?
NPPES lists California license number A109908, 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 Stephen Huynh-Hai Phan, M.D. prescribe under Medicare Part D?
In 2024, Stephen Huynh-Hai Phan, M.D. had 196 Medicare Part D claims for 78 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.