Quick answers
- Does Vivian C. Tsai accept Medicare assignment?
- Yes. Medicare's clinician data says Vivian C. Tsai accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Vivian C. Tsai see?
- In 2024, CMS data shows 129 Original Medicare patients and 247 services for Vivian C. Tsai. This counts Original Medicare only and measures volume, not quality.
- What is Vivian C. Tsai's NPI number?
- 1073781506. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Vivian C. Tsai, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 129 |
|---|---|
| Services billed to Medicare | 247 |
| Different services or procedures | 45 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)50 services
- Emergency department visit with moderate level of medical decision making (99284)22 services
- New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more (99204)21 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)16 services
- Detection test by immunoassay technique for severe acute respiratory syndrome coronavirus (87426)15 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High cholesterol71%
- High blood pressure67%
- Arthritis42%
- Diabetes31%
- Ischemic heart disease26%
- Anxiety24%
Hospitals where Vivian C. Tsai works
Medicare's Facility Affiliation Data lists Vivian C. Tsai at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Kaiser Foundation Hospital - South BayHarbor City, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: not listed by Medicare · CCN 050411
- Torrance Memorial Medical CenterTorrance, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050351
Practice locations
Addresses where Vivian C. Tsai is enrolled with Medicare (CMS data updated October 2, 2026).
- 26777 Agoura Rd, Suite B4Calabasas, CA 91302 (818) 880‑2225
- 2900 Lomita BlvdTorrance, CA 90505 (310) 257‑7260
- 855 Manhattan Beach Blvd, Suite 101Manhattan Beach, CA 90266 (310) 939‑7873
Group practices
Medicare enrollment lists Vivian C. Tsai as a member of these groups (CMS data updated October 2, 2026).
- Exer Medical Corporation340 clinicians in the group
- Torrance Health Association Inc299 clinicians in the group
Specialties
- Emergency Medicineprimary
Other emergency medicine doctors in Calabasas
Clinicians with the same Medicare primary specialty in Calabasas, CA — not a recommendation.
Other clinicians in Exer Medical Corporation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Chicago College Of Medicine And Surgery |
| Graduation year | 2004 (22 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1073781506 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians