Quick answers
- Where does Townson Tsai see patients?
- Medicare's clinician data lists 3 practice locations, including San Marcos, CA and San Diego, CA. Call before your visit to confirm the address.
- What is Townson Tsai's specialty?
- Medicare lists Infectious Disease as the primary specialty, and also Internal Medicine.
- Does Townson Tsai accept Medicare assignment?
- Yes. Medicare's clinician data says Townson Tsai accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Townson Tsai?
- (833) 574-2273, as listed in official Medicare / NPI Registry data.
- What is Townson Tsai's NPI number?
- 1316018369. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Townson Tsai is enrolled with Medicare (CMS data updated 2026-10-02).
- 360 Rush DrSan Marcos, CA 92078 (833) 574‑2273
- 400 Craven RdSan Marcos, CA 92078 (619) 528‑5000
- 4647 Zion AveSan Diego, CA 92120 (619) 528‑5000
Group practices
Medicare enrollment lists Townson Tsai as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Infectious Diseaseprimary
- Internal Medicinealso
Other infectious disease doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Diego School Of Medicine |
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316018369 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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