Timothy Tsai, DO
NPI 1447785704 · Family Medicine Physician · Stanford, CA
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Timothy Tsai, DO is a Family Medicine Physician provider in Stanford, CA (NPI 1447785704).
Provider details
- NPI number
- 1447785704
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 20A20059 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
9 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
336 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 136 | $80 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 90 | $112 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 50 | $86 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'SG2211 | 32 | $19 |
| Established Patient Office Or Other Outpatient Visit With Straightforward Medical Decision Making, If Using Time, 10 Minutes Or More99212 | 28 | $61 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Azathioprine Sodium | 91 | — |
| Atorvastatin Calcium | 89 | 35 |
| Losartan Potassium | 62 | 22 |
| Amlodipine Besylate | 54 | 17 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 50 | — |
| Dextrose 5 % in Waterbrand: Dextrose in Water | 49 | — |
| Hydromorphone Hcl/Pf |
Practice location
Mailing address
Registry dates
- Enumerated
- 2017-04-25
- Last updated
- 2024-04-17
- Certified
- 2024-04-17
Frequently asked questions
- What is Timothy Tsai's NPI number?
- Timothy Tsai's National Provider Identifier (NPI) is 1447785704, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Timothy Tsai's specialty?
- Timothy Tsai is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Timothy Tsai located?
- Timothy Tsai's practice location on file with NPPES is 300 Pasteur Dr, Stanford, CA 94305-2200.
- What is Timothy Tsai's phone number?
- The practice phone number listed in the NPPES registry for Timothy Tsai is (650) 723-4000.
- Does Timothy Tsai accept Medicare?
- Timothy Tsai is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Timothy Tsai's NPI active?
- Yes — Timothy Tsai's NPI (1447785704) is active in the NPPES registry as of the last update on 2024-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.