Tammy Y Chen, MD

1 location · Asian Health Services · 93 clinicians in this group

Hospitals listed: Alta Bates Summit Medical Center · Eden Medical Center. That is not proof they admit you there this week.

9 plans · 1 carrier

Licence A90848 · Current

Licensed to practise in California · since 2005 · expires 2027-03-31 · Chekiang Medical University Aka Zhejiang Medical University.

No disciplinary actions, convictions, malpractice judgments or citations in this record.

What this clinician told their state board, medical school and everything before it. Only some states publish this, so nothing here means the state does not say, not that there was no training or certification.

Specialty certification

• American Board of Family Medicine - Family Medicine

2 hospitals

These rate the hospital, not this clinician. Most measures at most hospitals are no different from the national rate.

• Alta Bates Summit Medical CenterOakland, CAAcute Care Hospital · Voluntary non-profit - Private · Has an emergency departmentPart of Sutter Health, which runs 27 hospitals in 2 statesPatients rate it 3 of 5 · 78% would definitely recommend it
  Overall rating: 5 of 5 starsBetter than the national rate — Death rate among surgical inpatients with serious treatable complications: 130.09 (87.72 to 172.46) · 109 cases, Jul 2022 – Jun 2024Better than the national rate — Central Line Associated Bloodstream Infection (ICU + select Wards): 0.274, Oct 2024 – Sep 2025Better than the national rate — Clostridium Difficile (C.Diff): 0.227, Oct 2024 – Sep 2025
• Eden Medical CenterCastro Valley, CAAcute Care Hospital · Voluntary non-profit - Other · Has an emergency department · Birthing-friendlyPart of Sutter Health, which runs 27 hospitals in 2 statesPatients rate it 3 of 5 · 75% would definitely recommend it
  Overall rating: 4 of 5 starsBetter than the national rate — Clostridium Difficile (C.Diff): 0.122, Oct 2024 – Sep 2025

$571

Medicare paid this office $571 for 60 people.

This is what Medicare paid the clinician — not Medicare Advantage, and not the pharmacy.

Who their Medicare patients are

60 Original Medicare patients in 2024. Average age 75 · Women 52% · Health risk score 1.18. Above the middle of the specialty; the typical family practice clinician is at 1.13.

Conditions among them: High blood pressure 73% · Diabetes 35% · Coronary heart disease 27% · Chronic kidney disease 23%.

The office billed $6,283, Medicare allowed $1,071 and paid $571; for 61 services of 1 kinds.

Original Medicare patients only. A risk score of 1.0 is the average Medicare patient; higher means sicker. Any count under 11 is hidden.

Year by year

Original Medicare only. A service billed for fewer than 11 people in a year is hidden, so the lines can add up to less than the year's total.

$256,139 in 2024

Medicaid paid $256,139 for 4,271 billed services this clinician did in 2024, up to 174 people in a month for one service.

Medicaid and CHIP claims where this clinician did the service, fee-for-service and managed care together. Any month with fewer than 11 patients is hidden, so small Medicaid practices undercount.

$124,678

Pharmacies billed $124,678 in 2024.

This is pharmacy cost, not the office bill, and not what patients paid.

1,534 generic and fewer than 11 brand-name prescriptions · $124,678 in drug cost · 55 antibiotic prescriptions to 52 people.

Part D prescriptions only. The opioid rate is opioid prescriptions as a share of all this clinician's Part D prescriptions; surgeons and pain specialists run higher than others, so it is shown against the same specialty.

Year by year

Part D prescriptions only. A drug prescribed to fewer than 11 people in a year is hidden.

$103 in 2019

A payment is not proof that care is biased.

NPI

1093887721

Licence

CA A90848California A90848: Current · expires 2027-03-31

Group

Asian Health Services

Gender

Female