Tsung Tso Tsai, M.D.
General Practice Physician · Ontario, CA
Tsung Tso Tsai, M.D. is a general practice physician with a practice address in Ontario, California, and NPI 1629250394, issued on Dec 4, 2007. Check the license (California A114112, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Tsung Tso Tsai
- Credential
- M.D.
- Primary taxonomy
- General Practice Physician 208D00000X
- License numbers
- A114112 CA
57.013814 OH
Self-reported in NPPES; status is on the state search - Practice location
- 2295 S Vineyard Ave, Ontario, CA 91761
- Phone
- (888) 750-0036
- Enumerated
- Dec 4, 2007
- Record last updated
- Nov 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110531000351); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 1,956 in California → Look up another NPI →
Also registered at 2295 S Vineyard Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ana Mae Abaya, NPFamily Nurse Practitioner1255164943
- Sheila Marie Adan, D.O.Family Medicine Physician1912272733
- Anna Alley, CRNACertified Registered Nurse Anesthetist1518399732
- Hye Hyun An, PHARMDPharmacist1578428470
- Leonila Araneta, LCSWClinical Social Worker1861771974
- Fernando AvilaFamily Medicine Physician1396364147
Verify Tsung Tso Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A114112Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average general practice physician in 2024
10,211 Medicare Part D claims for 1,270 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 843 claims were for opioids.
Most prescribed
- Atorvastatin Calcium641 claims
- Amlodipine Besylate461 claims
- Hydrocodone-Acetaminophen391 claims
- Lisinopril338 claims
- Levothyroxine Sodium278 claims
- Losartan Potassium264 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.
Bills Medicare through one group practice
- Southern California Permanente Medical GroupFontana, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Tsung Tso Tsai among 1,956 general practice physician records in California
Tsung Tso Tsai, M.D. is one of 1,956 general practice physician records with a practice address in California. 48% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 34% of them.
- NPI issued2007 · 34% of these records are older, 50% newer
- In a Medicare fileYes · 48% of these records are
- In the CMS Doctors and Clinicians fileYes · 27% of these records are
- Graduated2004 · median 1994 among the 520 with a school on file
- Record last updated2021 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
General Practice Physician providers in California
There are 1,956 general practice physician records in California.
All 1,956 in California → Every provider in Ontario → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- David Lozano, M.D.Ontario, CA 917611104041995
- Krupali Tejura, M.D.Ontario, CA 917611487848651
- Jose De La Llana, M.D.Ontario, CA 917621326244062
- Irma Lopez, M.D.Ontario, CA 917621538240908
- Miguel Castuera, PA-CMontclair, CA 917631679769897
- Jhujhar Singh, DOMontclair, CA 917631730361544
- Erik Wiele, DOMontclair, CA 917631619405875
- Brian Lee, M.D.Ontario, CA 917641932227626
Common questions
What is Tsung Tso Tsai, M.D.'s NPI number?
Tsung Tso Tsai, M.D.'s National Provider Identifier (NPI) is 1629250394, issued on Dec 4, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Tsung Tso Tsai, M.D. located?
The NPPES record lists a practice address at 2295 S Vineyard Ave, Ontario, CA, 91761. Phone: (888) 750-0036. Providers update this record themselves, so call before visiting.
How can I verify Tsung Tso Tsai, M.D.'s license?
NPPES lists California license number A114112, 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 Tsung Tso Tsai, M.D. prescribe under Medicare Part D?
In 2024, Tsung Tso Tsai, M.D. had 10,211 Medicare Part D claims for 1,270 beneficiaries; the average among general practice physician prescribers was 3,030. 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.