Chai-Yung Johnny Tsai, M.D.
Family Medicine Physician · Irvine, CA
Chai-Yung Johnny Tsai, M.D. is a family medicine physician with a practice address in Irvine, California, and NPI 1467428326, issued on Feb 28, 2006. Check the license (California A81441, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Chai-Yung Johnny Tsai
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A81441 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1190 Roosevelt # 100, Irvine, CA 92620
- Phone
- (949) 346-4456
- Enumerated
- Feb 28, 2006
- Record last updated
- Nov 14, 2018 (not updated in 8 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1190 Roosevelt # 100
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ryan Chen, MDFamily Medicine Physician1770112294
Verify Chai-Yung Johnny Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A81441Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
30 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Chai-Yung Johnny Tsai among 17,133 family medicine physician records in California
Chai-Yung Johnny Tsai, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- Record last updated2018 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
148 family medicine physician records list a practice address in Irvine
They are 148 of the 7,778 NPPES records with a practice address in Irvine, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Irvine → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
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- Dorsa Babai, D.O.Irvine, CA 926201285830315
- Bita Badakhshan, M.D.Irvine, CA 926201801058938
- Amine Chahbouni, D.O.Irvine, CA 926201326319021
- Felix Horng, MDIrvine, CA 926201578586046
- Steven Luh, M.DIrvine, CA 926201053368084
- Ali Miremadi, M.D.Irvine, CA 926201043435449
Common questions
What is Chai-Yung Johnny Tsai, M.D.'s NPI number?
Chai-Yung Johnny Tsai, M.D.'s National Provider Identifier (NPI) is 1467428326, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Chai-Yung Johnny Tsai, M.D. located?
The NPPES record lists a practice address at 1190 Roosevelt # 100, Irvine, CA, 92620. Phone: (949) 346-4456. Providers update this record themselves, so call before visiting.
How can I verify Chai-Yung Johnny Tsai, M.D.'s license?
NPPES lists California license number A81441, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Chai-Yung Johnny Tsai, M.D. prescribe under Medicare Part D?
In 2024, Chai-Yung Johnny Tsai, M.D. had 30 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.