Isaac K. Tsai, M.D.
Cardiovascular Disease Physician · Corona, CA
Isaac K. Tsai, M.D. is a cardiovascular disease physician with a practice address in Corona, California, and NPI 1013909407, issued on Aug 22, 2005. Check the license (California A39031, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Isaac K. Tsai
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A39031 CA
Self-reported in NPPES; status is on the state search - Practice location
- 341 Magnolia Ave., Corona, CA 92879
- Phone
- (951) 735-4771
- Enumerated
- Aug 22, 2005
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (951) 735-3855
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Verify Isaac K. Tsai in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A39031Check 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 cardiovascular disease physician in 2024
19 Medicare Part D claims, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D.
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.
The practice group's MIPS final score for 2023 (Medicare payment program): 100 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Isaac K. Tsai among 2,574 cardiovascular disease physician records in California
Isaac K. Tsai, M.D. is one of 2,574 cardiovascular disease physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 68% of these records are
- Record last updated2007 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RC0000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Cardiovascular Disease Physician providers in California
There are 2,574 cardiovascular disease physician records in California.
All 2,574 in California → Every provider in Corona → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Brian Chen, D.O.Corona, CA 928791053792366
- L R Moscoso, M.D.Corona, CA 928821073548962
- Gilbert Plasencia, M.D.Corona, CA 928821043245822
- Narakanti Rao, MDCorona, CA 928821003919655
- William Suh, MDCorona, CA 928821740200351
- Sa'd Tuqan, M.D.Corona, CA 928821629030895
- Mandira Patel, DOTemescal Valley, CA 928831114452810
- Derek Phan, MDTemescal Valley, CA 928831598184244
Common questions
What is Isaac K. Tsai, M.D.'s NPI number?
Isaac K. Tsai, M.D.'s National Provider Identifier (NPI) is 1013909407, issued on Aug 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Isaac K. Tsai, M.D. located?
The NPPES record lists a practice address at 341 Magnolia Ave., Corona, CA, 92879. Phone: (951) 735-4771. Providers update this record themselves, so call before visiting.
How can I verify Isaac K. Tsai, M.D.'s license?
NPPES lists California license number A39031, 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 Isaac K. Tsai, M.D. prescribe under Medicare Part D?
In 2024, Isaac K. Tsai, M.D. had 19 Medicare Part D claims; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
What is Isaac K. Tsai, M.D.'s MIPS final score?
The 2023 MIPS final score is 100 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.