Chai-Yung J. Tsai, M.D. a Professional Corporation
NPI 1366747586 · Family Medicine Physician · Irvine, CA
Chai-Yung J. Tsai, M.D. a Professional Corporation is a Family Medicine Physician organization in Irvine, CA (NPI 1366747586).
Provider details
- NPI number
- 1366747586
- Entity type
- Organization
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Chai-Yung Tsai, President(949) 346-4456
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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.
Practice location
Mailing address
Other names (DBA / former)
- Doing business as
- Portola Direct Primary Care
Registry dates
- Enumerated
- 2011-01-19
- Last updated
- 2016-08-02
Frequently asked questions
- What is Chai-Yung J. Tsai, M.D. a Professional Corporation's NPI number?
- Chai-Yung J. Tsai, M.D. a Professional Corporation's National Provider Identifier (NPI) is 1366747586, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Chai-Yung J. Tsai, M.D. a Professional Corporation?
- Chai-Yung J. Tsai, M.D. a Professional Corporation is classified in the NPPES registry as Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Chai-Yung J. Tsai, M.D. a Professional Corporation located?
- Chai-Yung J. Tsai, M.D. a Professional Corporation's practice location on file with NPPES is 3943 Irvine Blvd, Irvine, CA 92602-2400.
- What is Chai-Yung J. Tsai, M.D. a Professional Corporation's phone number?
- The practice phone number listed in the NPPES registry for Chai-Yung J. Tsai, M.D. a Professional Corporation is (949) 346-4456.
- Who is the authorized official for Chai-Yung J. Tsai, M.D. a Professional Corporation?
- The authorized official listed on Chai-Yung J. Tsai, M.D. a Professional Corporation's NPPES record is Chai-Yung Tsai, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Chai-Yung J. Tsai, M.D. a Professional Corporation's NPI active?
- Yes — Chai-Yung J. Tsai, M.D. a Professional Corporation's NPI (1366747586) is active in the NPPES registry as of the last update on 2016-08-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.