Tammy M. Chen
Physician Assistant · Diamond Bar, CA
Tammy M. Chen is a physician assistant with a practice address in Diamond Bar, California, and NPI 1285347377, issued on Jan 4, 2023. Check the license with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Tammy M. Chen
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 888 Brea Canyon RD, Diamond Bar, CA 91789
- Phone
- (909) 594-3382
- Enumerated
- Jan 4, 2023
- Record last updated
- Apr 15, 2026
- Fax
- (626) 667-7633
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 14,451 in California → Look up another NPI →
Verify Tammy M. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Tammy M. Chen among 14,451 physician assistant records in California
Tammy M. Chen is one of 14,451 physician assistant records with a practice address in California. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2023, is newer than 80% of them.
- NPI issued2023 · 80% of these records are older, 13% newer
- In a Medicare fileNo · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2026 · 40% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 physician assistant records list a practice address in Diamond Bar
They are 12 of the 598 NPPES records with a practice address in Diamond Bar, and 14,451 physician assistant records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 14,451 in California → Every provider in Diamond Bar → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Alan CeraldeWalnut, CA 917891982062881
- Craig Chase, PA-CWalnut, CA 917891861699621
- Sarah ChuDiamond Bar, CA 917891366197998
- Christiana De Jesus, PA-CWalnut, CA 917891003450214
- Luke Pata, PA-CWalnut, CA 917891558021097
- Isabel Wilhelm, PA-CWalnut, CA 917891013368315
- Dan Zeng, PA-CWalnut, CA 917891417270687
- Kimberly Amato, PACWest Covina, CA 917901477505014
Common questions
What is Tammy M. Chen's NPI number?
Tammy M. Chen's National Provider Identifier (NPI) is 1285347377, issued on Jan 4, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Tammy M. Chen located?
The NPPES record lists a practice address at 888 Brea Canyon RD, Diamond Bar, CA, 91789. Phone: (909) 594-3382. Providers update this record themselves, so call before visiting.
How can I verify Tammy M. Chen's license?
Search the California board that licenses this profession; the NPPES record confirms identity 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. 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.