Dr. Vivian W. Tsai, MD

  • Fremont, CA
  • Cardiologist
NPI1770534182PAC ID7315945540
Medicare services, 2024
2,813
Medicare patients, 2024
1,149
Part D claims, 2024
5,010
Publications
9
Hospital affiliations
1
Practice address
3200 Kearney Street, Fremont, CA 94538
Practice phone
Call (510) 498-2812
Professional email
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Personal email
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Mobile number
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Social profiles

Primary practice

Palo Alto Medical Foundation-Fremont Center

Mammography / Breast Imaging Center · Fremont, California

See all 4 affiliations

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Dr. Vivian W. Tsai is a cardiologist in Fremont, California

Dr. Tsai practices at Palo Alto Medical Foundation-Fremont Center in Fremont, California.

Dr. Tsai's NPI, 1770534182, was assigned on May 12, 2006. Dr. Tsai graduated from The Johns Hopkins University School of Medicine in 2003. Dr. Tsai holds California license A88245.

NPI and contact details
Medicare PAC ID
7315945540
NPI enumeration date
May 12, 2006
NPI status
Active
Accepts Medicare assignment
Yes
Offers telehealth
Yes
Practice phone
(510) 498-2812
Professional email
Get email
Personal email
Get email
Mobile number
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Sex
Female
Estimated age
49
Medical school graduation
2003

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)

Dr. Vivian W. Tsai practices at Palo Alto Medical Foundation-Fremont Center in Fremont, California

Dr. Tsai's primary practice is Palo Alto Medical Foundation-Fremont Center, at 3200 Kearney Street, Fremont, CA 94538. The practice phone is (510) 498-2812.

  • Palo Alto Medical Foundation-Fremont Center
    3200 Kearney Street, Fremont, CA 94538Phone(510) 498-2812

Source: Dmand AI Affiliation Data

Dr. Vivian W. Tsai is affiliated with 3 sites of care and 1 medical group

Dr. Tsai's primary practice is Palo Alto Medical Foundation-Fremont Center in Fremont, California. Dr. Tsai is also affiliated with Washington Health. The medical group on file is Palo Alto Foundation Medical Group. Dmand AI also links Dr. Tsai to 1 more group practice or clinic, named with a free account. Dr. Tsai's employer is on file too: a breast imaging center.

See all 4 affiliations for Dr. Tsai

Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data

Dmand AI tracks the EHR system at Dr. Vivian W. Tsai's practice

Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Tsai practices, 3 sites in all. Vendor and product names are available with a free account.

EHR by site
SiteEHR vendor and product
Palo Alto Medical Foundation-Fremont CenterAvailable with a free account
+2 more affiliated sitesAvailable with a free account

Source: Dmand AI Technology Install Data

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Dr. Vivian W. Tsai is one of 2,375 cardiologists in California

Cardiovascular disease is Dr. Tsai's primary specialty in the NPI Registry, under taxonomy code 207RC0000X. Dr. Tsai is board certified in cardiovascular disease by the American Board of Internal Medicine. Dr. Tsai is licensed in California.

Specialties and state licenses

  • Cardiovascular disease, CaliforniaPrimaryLicense A88245 · 2004 to 2026 · taxonomy 207RC0000X

Clinical focus

Dmand AI lists aneurysm, aortic atherosclerois, atrial fibrillation and flutter, cardiomyopathy, cerebrovascular disease, chronic hypertension, congestive heart failure and coronary artery disease among the conditions Dr. Tsai treats.

Cardiologists near Dr. Tsai

Counts of cardiologists with a Dmand AI profile, by place and practice. Each opens the list.

Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks

Dr. Vivian W. Tsai billed Medicare for 2,813 services in 2024

CMS data shows 2,813 Medicare services from Dr. Tsai across 24 procedure codes in 2024, for 1,149 Medicare patients. Medicare paid $233,656 for them.

Medicare services, 20242,813
Medicare patients1,149
Paid by Medicare$233,656
Procedure codes24

Dr. Tsai's Medicare services by type, 2023 to 2024

  • 2023
  • 2024
Tests and treatments
2023: 1,2472024: 1,3387%
Office and hospital visits
2023: 9572024: 9283%
Other services
2023: 1212024: 414242%
Drugs given in the office
2023: 812024: 6816%
Imaging
2023: 692024: 656%

Where Dr. Tsai's Medicare services took place, 2024

  • In an office2,66295%
  • In a facility1515%

Dr. Tsai compared with the California median for cardiologists, 2024

  • Dr. Tsai
  • California median
Medicare services
2,813vs 1,56080% above
Medicare patients
1,149vs 64478% above
Part D claims
4,730vs 1,4103.4 times

Medians across 2,237 cardiologists in California with Dmand AI profiles that report each measure.

Dr. Tsai's most billed Medicare procedure codes, 2024

CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.

See all procedures by Dr. Tsai

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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks

Dr. Vivian W. Tsai treated 1,149 Medicare patients in 2024, average age 77

CMS counts 1,149 Medicare patients who saw Dr. Tsai in 2024. The largest group is 75 to 84, with 459 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 19% are also on Medicaid. Their average risk score is 1.20, where 1.00 is the Medicare average.

Across all payers, Dmand AI patient panel data puts Dr. Tsai's median patient age at 59, with 49% women.

Medicare patients, 20241,149
Average age77
Average risk score1.20
Also on Medicaid19%

Dr. Tsai's Medicare patients by age, 2024

Dr. Tsai's Medicare patients by sex, 2024

  • Women63655%
  • Men51345%

Chronic conditions among Dr. Tsai's Medicare patients, 2024

  1. High blood pressure75%
  2. High cholesterol75%
  3. Ischemic heart disease44%
  4. Arthritis39%
  5. Diabetes35%
  6. Atrial fibrillation28%
  7. Chronic kidney disease28%
  8. Osteoporosis21%

Share of Medicare patients with each condition. A patient can have several.

Dr. Tsai's patients across all payers

Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.

Patient panel by age, all payers

Median age 59

Patient panel by sex, all payers

  • Women49%
  • Men49%

Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data

Dr. Vivian W. Tsai wrote 5,010 Medicare Part D claims in 2024

In 2024, Dr. Tsai wrote 5,010 Medicare Part D claims for 379 patients. 87% of them were for generic drugs. CMS names the drug for 4,730 of them, across 43 drugs with 11 or more claims each, at $852,433 in total drug cost. In 2023, CMS named 4,601 claims across 46 drugs.

Part D claims, 20245,010
Drugs named by CMS43
Total drug cost$852,433
Part D patients379

Dr. Tsai's Part D claims by kind of drug, 2024

  • Generic4,355 claims87%
  • Brand-name655 claims13%

Dr. Tsai's most prescribed drugs by claims, 2024

CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.

Part D claims for drugs CMS names, 2023 to 2024

  • 2023
  • 2024
Claims for drugs CMS names
2023: 4,6012024: 4,7303%

Drugs named by CMS: 43 in 2024, 46 in 2023.

See all prescribing by Dr. Tsai

Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data

Dr. Vivian W. Tsai offers telehealth to Medicare patients

Dr. Tsai accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Tsai as offering telehealth.

Accepts Medicare assignment
Yes
Offers telehealth
Yes

Source: Doctors and Clinicians National Downloadable File (CMS)

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Dr. Vivian W. Tsai has 9 publications on record

Dmand AI links 9 papers to Dr. Tsai, published from 2007 to 2015. 2015 was the busiest year, with 3. The most frequent topics are Defibrillators, Implantable, Heart Failure and Comorbidity. Dr. Tsai has published most often in Circ Cardiovasc Qual Outcomes. Dr. Tsai's most frequent co-authors are Paul Allen Heidenreich, MD, Mary K. Goldstein, MD and Henry H. Hsia, MD.

Papers9
Years published2007 to 2015

Dr. Tsai's papers by year, 2007 to 2015

Topics Dr. Tsai writes about most

  • Defibrillators, Implantable
  • Heart Failure
  • Comorbidity
  • Death, Sudden, Cardiac
  • Electric Countershock
  • Heart Arrest
  • Primary Prevention
  • Ventricular Dysfunction, Left

Dr. Tsai's most frequent co-authors

Recent publications by Dr. Tsai

See all 9 publications and co-authors

See who Dr. Tsai researches with

Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Tsai works with, so you can find a warm path to the right cardiologists.

How network discovery works

Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage

Dr. Vivian W. Tsai received $91 in industry payments from 2017 to 2025

CMS Open Payments shows 3 general payments to Dr. Tsai from 3 drug and device companies from 2017 to 2025. Food and beverage make up the largest share, 100% of the total. Cleerly, Inc. paid the most, $48.

General payments to Dr. Tsai by program year, 2017 to 2025

Companies that paid Dr. Tsai the most, 2017 to 2025

Share is of all general payments to this clinician.

See all payments to Dr. Tsai

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Dr. Vivian W. Tsai has 1 award and honors on record

Dmand AI lists 1 award for Dr. Tsai, most recently CMS Stage 1 EHR in 2013.

Awards and honors for Dr. Tsai

  1. 2013
    • CMS Stage 1 EHR

Source: Dmand AI Professional Profile Data

Dr. Vivian W. Tsai graduated from The Johns Hopkins University School of Medicine

Dr. Tsai graduated from The Johns Hopkins University School of Medicine in 2003. Dr. Tsai is a member of ACC.

  1. Medical schoolThe Johns Hopkins University School of Medicine
  2. Board certified in cardiovascular diseaseAmerican Board of Internal Medicine
  3. Board certified in internal medicineAmerican Board of Internal Medicine

Source: Dmand AI Professional Profile Data

Dr. Vivian W. Tsai accepts plans from 12 insurance carriers

Dr. Tsai is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.

  • Aetna
  • Blue Cross Blue Shield of Michigan
  • United Healthcare
  • Elevance
  • HCSC
  • Blue Cross Blue Shield of Massachusetts
  • Alliant Health Plans
  • Blue Cross and Blue Shield of Kansas City
  • +4 more carriersWith a free account

Plan types Dr. Tsai accepts, by number of carriers

  1. PPO8
  2. HMO6
  3. Medicare6
  4. EPO4
  5. POS3

Source: Dmand AI Insurance Network Data

Sources for Dr. Vivian W. Tsai's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneDmand AI Affiliation Data
Primary practice, affiliations and health systemDmand AI Affiliation DataDmand AI Org Hierarchy Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)
Publications, topics and co-authorsPubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage
Industry paymentsOpen Payments (CMS) (opens in a new tab)
Awards and committee rolesDmand AI Professional Profile Data
Training, board certification and membershipsDmand AI Professional Profile Data
Insurance carriers and plan typesDmand AI Insurance Network Data
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Dr. Vivian W. Tsai

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

What is Dr. Vivian W. Tsai's NPI number?

Dr. Vivian W. Tsai's NPI number is 1770534182. It was assigned on May 12, 2006, and it is active in the NPI Registry.

What kind of doctor is Dr. Vivian W. Tsai?

Dr. Vivian W. Tsai is a cardiologist in Fremont, California. The primary specialty in the NPI Registry is Cardiovascular Disease Physician (taxonomy code 207RC0000X).

Where does Dr. Vivian W. Tsai practice?

Dr. Tsai practices at 3200 Kearney Street, Fremont, CA 94538. Dr. Tsai's primary practice is Palo Alto Medical Foundation-Fremont Center in Fremont, California. Dmand AI also links Dr. Tsai to 1 group practice or clinic.

What is Dr. Vivian W. Tsai's office phone number?

The practice phone on file for Dr. Tsai is (510) 498-2812.

What is Dr. Vivian W. Tsai's medical license number?

Dr. Tsai holds California license A88245.

Which hospitals is Dr. Vivian W. Tsai affiliated with?

Dr. Tsai is affiliated with Washington Health.

What medical group is Dr. Vivian W. Tsai part of?

Dr. Tsai is linked to Palo Alto Foundation Medical Group.

Does Dr. Vivian W. Tsai accept Medicare?

Yes. CMS data shows Dr. Tsai billed Medicare for 2,813 services in 2024, and Dr. Tsai accepts Medicare assignment.

Does Dr. Vivian W. Tsai offer telehealth?

Yes. The CMS Doctors and Clinicians file lists Dr. Tsai as offering telehealth services.

How many Medicare patients does Dr. Vivian W. Tsai see?

CMS counts 1,149 Medicare patients who saw Dr. Tsai in 2024, with an average age of 77.

Show 9 more questionsShow fewer questions

Is Dr. Vivian W. Tsai board certified?

Yes. Dr. Tsai is board certified in cardiovascular disease by the American Board of Internal Medicine.

What services does Dr. Vivian W. Tsai bill to Medicare?

In 2024, Dr. Tsai's most billed Medicare services were office visit, established patient (99214), heart test or procedure (93000) and office visit, established patient (99215).

Where did Dr. Vivian W. Tsai go to medical school?

Dr. Tsai graduated from The Johns Hopkins University School of Medicine in 2003.

What drugs does Dr. Vivian W. Tsai prescribe most?

In 2024 Medicare Part D data, Dr. Tsai's most prescribed drugs by claims were Atorvastatin Calcium, Metoprolol Succinate and Amlodipine Besylate.

Has Dr. Vivian W. Tsai received payments from drug or device companies?

CMS Open Payments shows $91 in general payments to Dr. Tsai from 3 companies from 2017 to 2025. The largest total came from Cleerly, Inc.

How long has Dr. Vivian W. Tsai been practicing?

Dr. Tsai graduated from medical school in 2003, 23 years ago.

Does Dr. Vivian W. Tsai do research?

Dmand AI links 9 publications to Dr. Tsai, published from 2007 to 2015.

Who does Dr. Vivian W. Tsai publish with?

Dr. Tsai's most frequent co-authors are Paul Allen Heidenreich, MD (6 shared papers), Mary K. Goldstein, MD (3 shared papers) and Henry H. Hsia, MD (3 shared papers).

What insurance does Dr. Vivian W. Tsai accept?

Dr. Tsai is in network with 12 carriers, including Aetna, Blue Cross Blue Shield of Michigan and United Healthcare. PPO plans come from the most carriers, 8. Check the plan with the practice before a visit.

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