Ronald Tsao, M.D.
Internal Medicine Physician · Redondo Beach, CA
Ronald Tsao, M.D. is an internal medicine physician with a practice address in Redondo Beach, California, and NPI 1770802746, issued on May 28, 2010. Check the license (California A138271, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ronald Tsao
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A138271 CA
Self-reported in NPPES; status is on the state search - Practice location
- 514 N Prospect Ave, Redondo Beach, CA 90277
- Phone
- (310) 937-8555
- Enumerated
- May 28, 2010
- Record last updated
- Oct 13, 2017 (not updated in 9 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20151012002251); accepts Medicare assignment
- Medical or professional school
- University Of Illinois College Of Med (Chi/Peor/Rock/Chm-Urb), 2010
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 514 N Prospect Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Beverly Chen, M.D.Gastroenterology Physician1154622454
Verify Ronald Tsao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A138271Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
33% fewer Medicare Part D claims than the average internal medicine physician in 2024
2,123 Medicare Part D claims for 237 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium274 claims
- Amlodipine Besylate149 claims
- Losartan Potassium107 claims
- Hydrochlorothiazide63 claims
- Levothyroxine Sodium57 claims
- Rosuvastatin Calcium52 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 2 group practices
- The Regents OF The University OF CaliforniaLos Angeles, CA
- Venice Family ClinicSanta Monica, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald Tsao among 17,696 internal medicine physician records in California
Ronald Tsao, M.D. is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2010, is newer than 63% of them.
- NPI issued2010 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2010 · median 2004 among the 11,065 with a school on file
- Record last updated2017 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 internal medicine physician records list a practice address in Redondo Beach
They are 28 of the 1,513 NPPES records with a practice address in Redondo Beach, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Redondo Beach → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- George Alexander, M.D.Redondo Beach, CA 902771265595136
- John Armato, MDRedondo Beach, CA 902771447263926
- Weip Chen, M.D.Redondo Beach, CA 902771295754281
- Julie Delilly, M.DRedondo Beach, CA 902771790890408
- Gabriele Engelhardt, M.D.Redondo Beach, CA 902771992810634
- Diane Ferguson, M.D.Redondo Beach, CA 902771447294384
- Brian Gee, M.D.Redondo Beach, CA 902771962585828
- John Johnson, MDRedondo Beach, CA 902771194786764
Common questions
What is Ronald Tsao, M.D.'s NPI number?
Ronald Tsao, M.D.'s National Provider Identifier (NPI) is 1770802746, issued on May 28, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Tsao, M.D. located?
The NPPES record lists a practice address at 514 N Prospect Ave, Redondo Beach, CA, 90277. Phone: (310) 937-8555. Providers update this record themselves, so call before visiting.
How can I verify Ronald Tsao, M.D.'s license?
NPPES lists California license number A138271, 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 Ronald Tsao, M.D. prescribe under Medicare Part D?
In 2024, Ronald Tsao, M.D. had 2,123 Medicare Part D claims for 237 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.