Chien Sun, M.D.
Emergency Medicine Physician · Anaheim, CA
Chien Sun, M.D. is an emergency medicine physician with a practice address in Anaheim, California, and NPI 1326153750, issued on Aug 19, 2006. Check the license (California A77365, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chien Sun
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A77365 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3440 E LA Palma Ave, Anaheim, CA 92806
- Phone
- (714) 644-2800
- Enumerated
- Aug 19, 2006
- Record last updated
- Dec 3, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00A773650 CA
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 3440 E LA Palma Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ricardo Bardales MendozaInternal Medicine Physician1801103130
- Sharrise Boop, MSWSocial Worker1134643489
Verify Chien Sun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A77365Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
67% fewer Medicare Part D claims than the average emergency medicine physician in 2024
74 Medicare Part D claims for 54 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.
Chien Sun among 7,751 emergency medicine physician records in California
Chien Sun, 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 59% of these records are
- Record last updated2021 · 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 Anaheim → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Stephanie Chen, M.D.Anaheim, CA 928061669634432
- Cory Hata, DOAnaheim, CA 928061508136847
- Charles Lu, DOAnaheim, CA 928061104189414
- John McCoy, D.O.Anaheim, CA 928061730499336
- Tuan Nguyen, D.O.Anaheim, CA 928061861636037
- Sean Wilson, MDAnaheim, CA 928061528320231
- Albert Aparicio, MDAnaheim, CA 928051336645852
- Robert Becker, MDAnaheim, CA 928071487725362
Common questions
What is Chien Sun, M.D.'s NPI number?
Chien Sun, M.D.'s National Provider Identifier (NPI) is 1326153750, issued on Aug 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Chien Sun, M.D. located?
The NPPES record lists a practice address at 3440 E LA Palma Ave, Anaheim, CA, 92806. Phone: (714) 644-2800. Providers update this record themselves, so call before visiting.
How can I verify Chien Sun, M.D.'s license?
NPPES lists California license number A77365, 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 Chien Sun, M.D. prescribe under Medicare Part D?
In 2024, Chien Sun, M.D. had 74 Medicare Part D claims for 54 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.