Wendy Tseng, M.D., M.S.
NPI 1609296680 · Internal Medicine Physician · South San Francisco, CA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Wendy Tseng, M.D., M.S. is a Internal Medicine Physician provider in South San Francisco, CA (NPI 1609296680).
Provider details
- NPI number
- 1609296680
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D., M.S.
- Sex
- Female
- Sole proprietor
- Yes
- License
- PG168262 (OR)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
29 Medicare services, 2024 (ranked within specialty)
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 methodology.
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) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 29 | $81 |
Typical Medicare-allowed amounts for these services range $81–$81 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 21 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Furosemide | 49 | 30 |
| Omeprazole | 30 | 17 |
| Dabigatran Etexilate Mesylatebrand: Pradaxa | 27 | 16 |
| Atorvastatin Calcium | 23 | 12 |
| Amlodipine Besylate | 22 | 15 |
| Pantoprazole Sodium | 20 | — |
| Rosuvastatin Calcium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2014-04-17
- Last updated
- 2022-09-02
- Certified
- 2022-09-02
Frequently asked questions
- What is Wendy Tseng's NPI number?
- Wendy Tseng's National Provider Identifier (NPI) is 1609296680, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Wendy Tseng's specialty?
- Wendy Tseng is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Wendy Tseng located?
- Wendy Tseng's practice location on file with NPPES is 1200 El Camino Real, South San Francisco, CA 94080-3208.
- What is Wendy Tseng's phone number?
- The practice phone number listed in the NPPES registry for Wendy Tseng is (650) 742-2000.
- Does Wendy Tseng accept Medicare?
- Wendy Tseng is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Wendy Tseng's NPI active?
- Yes — Wendy Tseng's NPI (1609296680) is active in the NPPES registry as of the last update on 2022-09-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.