Dr. Vivian C. Tsai, MD
- Medicare services, 2024
- 146
- Medicare patients, 2024
- 129
- Part D claims, 2024
- 374
- Hospital affiliations
- 2
- Industry payments
- $592
- Practice address
- 25825 South Vermont Avenue, Harbor City, CA 90710
- Practice phone
- Call (310) 325-5111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Tsai's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Vivian C. Tsai is an emergency medicine physician in Harbor City, California
Dr. Tsai practices at Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente.
Dr. Tsai's NPI, 1073781506, was assigned on February 19, 2008. Dr. Tsai graduated from Chicago College of Medicine and Surgery in 2004. Dr. Tsai holds California license C133217.
- NPI
- 1073781506NPI Registry (opens in a new tab)
- Medicare PAC ID
- 2769518455
- NPI enumeration date
- February 19, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 325-5111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 48
- Medical school graduation
- 2004
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Vivian C. Tsai practices at Kaiser Permanente South Bay Medical Center in Harbor City, California
Dr. Tsai's primary practice is Kaiser Permanente South Bay Medical Center, at 25825 South Vermont Avenue, Harbor City, CA 90710 in Los Angeles County. The practice phone is (310) 325-5111.
- Kaiser Permanente South Bay Medical Center25825 South Vermont Avenue, Harbor City, CA 90710 · Los Angeles CountyPhone(310) 325-5111
Source: Dmand AI Affiliation Data
Dr. Vivian C. Tsai is affiliated with 3 sites of care and 6 medical groups
Dr. Tsai's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente. Dr. Tsai is also affiliated with Torrance Memorial Medical Center. The medical group on file is Torrance Memorial Physician Network. Dmand AI also links Dr. Tsai to 5 more medical groups and 1 group practice or clinic, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Vivian C. 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.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente South Bay Medical Center | Available with a free account |
| +2 more sites and 5 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Vivian C. Tsai is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Tsai's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dr. Tsai is board certified in emergency medicine by the American Board of Emergency Medicine. Dmand AI has Dr. Tsai's licenses on file in 2 states: California and New York.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- New York license
Emergency medicine physicians near Dr. Tsai
Counts of emergency medicine physicians 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 C. Tsai billed Medicare for 146 services in 2024
CMS data shows 146 Medicare services from Dr. Tsai across 7 procedure codes in 2024, for 129 Medicare patients. Medicare paid $11,982 for them.
Dr. Tsai's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1222024: 1202%
- Lab and pathology
- 2023: 602024: 2657%
Where Dr. Tsai's Medicare services took place, 2024
- In an office12485%
- In a facility2215%
Dr. Tsai compared with the California median for emergency medicine physicians, 2024
- Dr. Tsai
- California median
- Medicare services
- 146vs 26545% below
- Medicare patients
- 129vs 24347% below
- Part D claims
- 215vs 623.5 times
Medians across 7,079 emergency medicine physicians 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.
Need commercial claims for Dr. Tsai?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Tsai and other emergency medicine physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Vivian C. Tsai treated 129 Medicare patients in 2024, average age 72
CMS counts 129 Medicare patients who saw Dr. Tsai in 2024. The largest group is 65 to 74, with 67 patients. 71% of them have high cholesterol, and 67% have high blood pressure. 25% are also on Medicaid. Their average risk score is 1.43, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Tsai's median patient age at 41, with 60% women.
Dr. Tsai's Medicare patients by age, 2024
Dr. Tsai's Medicare patients by sex, 2024
- Women8062%
- Men4938%
Chronic conditions among Dr. Tsai's Medicare patients, 2024
- High cholesterol71%
- High blood pressure67%
- Arthritis42%
- Diabetes31%
- Ischemic heart disease26%
- Anxiety24%
- Mood disorders22%
- Depression21%
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 41
Patient panel by sex, all payers
- Women60%
- Men40%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Vivian C. Tsai wrote 374 Medicare Part D claims in 2024
In 2024, Dr. Tsai wrote 374 Medicare Part D claims for 262 patients. 89% of them were for generic drugs. CMS names the drug for 215 of them, across 8 drugs with 11 or more claims each, at $1,800 in total drug cost. In 2023, CMS named 225 claims across 10 drugs.
Dr. Tsai's Part D claims by kind of drug, 2024
- Generic334 claims89%
- Brand-name and other40 claims11%
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.
Drug classes CMS tracks in Dr. Tsai's Part D claims, 2024
- Opioids11%40 of 374 claims
- Antibiotics35%130 of 374 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2252024: 2154%
Drugs named by CMS: 8 in 2024, 10 in 2023.
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
How Dr. Vivian C. Tsai takes part in Medicare
Dr. Tsai accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of nail tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Vivian C. Tsai received $592 in industry payments from 2016 to 2023
CMS Open Payments shows 6 general payments to Dr. Tsai from 4 drug and device companies from 2016 to 2023. Food and beverage make up the largest share, 100% of the total. Ironwood Pharmaceuticals, Inc paid the most, $348.
General payments to Dr. Tsai by program year, 2016 to 2023
Companies that paid Dr. Tsai the most, 2016 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Vivian C. Tsai graduated from Chicago College of Medicine and Surgery
Dr. Tsai graduated from Chicago College of Medicine and Surgery in 2004.
- Medical school
- Board certified in emergency medicine
Source: Dmand AI Professional Profile Data
Sources for Dr. Vivian C. Tsai's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Vivian C. 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 C. Tsai's NPI number?
Dr. Vivian C. Tsai's NPI number is 1073781506. It was assigned on February 19, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Vivian C. Tsai?
Dr. Vivian C. Tsai is an emergency medicine physician in Harbor City, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Vivian C. Tsai practice?
Dr. Tsai practices at 25825 South Vermont Avenue, Harbor City, CA 90710. Dr. Tsai's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente. Dmand AI also links Dr. Tsai to 5 medical groups and 1 group practice or clinic.
What is Dr. Vivian C. Tsai's office phone number?
The practice phone on file for Dr. Tsai is (310) 325-5111.
What is Dr. Vivian C. Tsai's medical license number?
Dr. Tsai holds California license C133217, one of the licenses on file in 2 states.
Which states has Dr. Vivian C. Tsai been licensed in?
Dmand AI has state licenses on file for Dr. Tsai in California and New York.
Which hospitals is Dr. Vivian C. Tsai affiliated with?
Dr. Tsai practices at Kaiser Permanente South Bay Medical Center in Harbor City, California. Dr. Tsai is also affiliated with Torrance Memorial Medical Center.
What medical group is Dr. Vivian C. Tsai part of?
Dr. Tsai is linked to Torrance Memorial Physician Network. Dmand AI links Dr. Tsai to 5 more medical groups.
Does Dr. Vivian C. Tsai accept Medicare?
Yes. CMS data shows Dr. Tsai billed Medicare for 146 services in 2024, and Dr. Tsai accepts Medicare assignment.
How many Medicare patients does Dr. Vivian C. Tsai see?
CMS counts 129 Medicare patients who saw Dr. Tsai in 2024, with an average age of 72.
Show 6 more questionsShow fewer questions
Is Dr. Vivian C. Tsai board certified?
Yes. Dr. Tsai is board certified in emergency medicine by the American Board of Emergency Medicine.
What services does Dr. Vivian C. Tsai bill to Medicare?
In 2024, Dr. Tsai's most billed Medicare services were office visit, established patient (99214), emergency department visit (99284) and office visit, new patient (99204).
Where did Dr. Vivian C. Tsai go to medical school?
Dr. Tsai graduated from Chicago College of Medicine and Surgery in 2004.
What drugs does Dr. Vivian C. Tsai prescribe most?
In 2024 Medicare Part D data, Dr. Tsai's most prescribed drugs by claims were Prednisone, Albuterol Sulfate Hfa and Cephalexin.
Has Dr. Vivian C. Tsai received payments from drug or device companies?
CMS Open Payments shows $592 in general payments to Dr. Tsai from 4 companies from 2016 to 2023. The largest total came from Ironwood Pharmaceuticals, Inc.
How long has Dr. Vivian C. Tsai been practicing?
Dr. Tsai graduated from medical school in 2004, 22 years ago.
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