Sandra Tsai, MD
NPI 1083717359 · Internal Medicine Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sandra Tsai, MD is a Internal Medicine Physician provider in Stanford, CA (NPI 1083717359).
Provider details
- NPI number
- 1083717359
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Female
- Sole proprietor
- No
- License
- A65925 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
423 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 105 | $123 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 85 | $89 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 55 | $61 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 44 | $107 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 30 | $151 |
| Ambulatory Blood Pressure Monitoring, 1 Day Or Longer, With Review, Interpretation and Report |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 41 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 158 | 45 |
| Amlodipine Besylate | 128 | 34 |
| Rosuvastatin Calcium | 126 | 40 |
| Losartan Potassium | 93 | 26 |
| Ezetimibe | 64 | 24 |
| Levothyroxine Sodium | 62 | 17 |
| Hydrochlorothiazide | 61 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$129 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-05
- Last updated
- 2024-04-24
- Certified
- 2024-04-24
Frequently asked questions
- What is Sandra Tsai's NPI number?
- Sandra Tsai's National Provider Identifier (NPI) is 1083717359, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sandra Tsai's specialty?
- Sandra Tsai is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Sandra Tsai located?
- Sandra Tsai's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Sandra Tsai's phone number?
- The practice phone number listed in the NPPES registry for Sandra Tsai is (650) 723-4000.
- Does Sandra Tsai accept Medicare?
- Sandra Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sandra Tsai's NPI active?
- Yes — Sandra Tsai's NPI (1083717359) is active in the NPPES registry as of the last update on 2024-04-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.