Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Tammy Yue Chen, MD

Individual provider Family Medicine Physician · NPI 1093887721

Tammy Yue Chen, MD is registered under Family Practice in Oakland, California. Qualified in 1982, 44 years ago. Practices with Asian Health Services, a 91-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
44
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

818 Webster St
Oakland, CA 94607-4220 Not confirmed with CMS for 19 years — call before visiting
Phone: (510) 986-6830
Fax: (510) 986-6890
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence A90848 (CA)

Record details

NPI number1093887721
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 15, 2006
Last updated in NPPESJuly 8, 2007

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolOTHER
Graduated 1982 (44 years in practice)
Group practice Asian Health Services — 91 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients60
Services billed 61 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Asian Health Services

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 91 clinicians in the practice; 12 are shown here.

Other providers in Oakland