Joseph Chungsun Chao, M.D.
Cardiovascular Disease Physician · Mountain View, CA
Joseph Chungsun Chao, M.D. is a cardiovascular disease physician with a practice address in Mountain View, California, and NPI 1992891493, issued on Oct 4, 2006. Check the license (California A45961, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joseph Chungsun Chao
- Credential
- M.D.
- Primary taxonomy
- Cardiovascular Disease Physician 207RC0000X
- License number
- A45961 CA
Self-reported in NPPES; status is on the state search - Practice location
- 525 South Drive, Mountain View, CA 94040
- Phone
- (650) 962-0242
- Enumerated
- Oct 4, 2006
- Record last updated
- Apr 15, 2024
- Medicaid ID
- 00A459610 CA
- Medicare enrollment
- Enrolled (PECOS I20100329000713); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest cardiovascular disease physician records → All 2,574 in California → Look up another NPI →
Also registered at 525 South Drive
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joseph Chungsun Chao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A45961Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average cardiovascular disease physician in 2024
697 Medicare Part D claims for 144 beneficiaries, against an average of 3,078 among the 20,728 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims.
Most prescribed
- Rosuvastatin Calcium244 claims
- Metoprolol Succinate47 claims
- Atorvastatin Calcium32 claims
- Eliquis30 claims
- Metformin Hcl30 claims
- Atenolol24 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.
The MIPS final score for 2023 (Medicare payment program): 17.7 of 100
The Merit-based Incentive Payment System score is reported for this clinician. 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; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $1,777.66
51 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 16,686 providers of this specialty with any payment received $3,819.56 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Joseph Chungsun Chao among 2,574 cardiovascular disease physician records in California
Joseph Chungsun Chao, 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 2006, is newer than 10% of them.
- NPI issued2006 · 10% of these records are older, 45% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1976 · median 1999 among the 1,742 with a school on file
- Record last updated2024 · 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 Mountain View → Cardiovascular Disease Physician nationwide →
The 8 cardiovascular disease physician records with the nearest ZIP codes
- Clayton Bavor, M.D.Mountain View, CA 940401912912569
- Edward Bough, M.D.Mountain View, CA 940401417962994
- Catherine Collings, M.D.Mountain View, CA 940401447253349
- Frank Galli, M.D.Mountain View, CA 940401790788693
- Surendra Gudapati, M.D.Mountain View, CA 940401245262716
- Martin Klughaupt, M.D.Mountain View, CA 940401558378711
- Felix Lee, MDMountain View, CA 940401811975113
- L. Liem, DOMountain View, CA 940401932103827
Common questions
What is Joseph Chungsun Chao, M.D.'s NPI number?
Joseph Chungsun Chao, M.D.'s National Provider Identifier (NPI) is 1992891493, issued on Oct 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Chungsun Chao, M.D. located?
The NPPES record lists a practice address at 525 South Drive, Mountain View, CA, 94040. Phone: (650) 962-0242. Providers update this record themselves, so call before visiting.
How can I verify Joseph Chungsun Chao, M.D.'s license?
NPPES lists California license number A45961, 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 Joseph Chungsun Chao, M.D. prescribe under Medicare Part D?
In 2024, Joseph Chungsun Chao, M.D. had 697 Medicare Part D claims for 144 beneficiaries; the average among cardiovascular disease physician prescribers was 3,078. Part D covers Medicare prescriptions only.
What is Joseph Chungsun Chao, M.D.'s MIPS final score?
The 2023 MIPS final score is 17.7 of 100. 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.