John M. Tsao, MD
Endocrinology, Diabetes & Metabolism Physician · Torrance, CA
John M. Tsao, MD is an endocrinology, diabetes & metabolism physician with a practice address in Torrance, California, and NPI 1194736082, issued on Aug 10, 2006. Check the license (California C23235, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John M. Tsao
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- C23235 CA
Self-reported in NPPES; status is on the state search - Practice location
- 20911 Earl St Ste 340, Torrance, CA 90503
- Phone
- (310) 542-6333
- Enumerated
- Aug 10, 2006
- Record last updated
- Aug 2, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (310) 542-4695
- Medicaid IDs
- 00C232350 CA
1194736082 CA - Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Also registered at 20911 Earl St Ste 340
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John M. Tsao in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C23235Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
45 Medicare Part D claims, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Amlodipine Besylate20 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.
John M. Tsao among 1,131 endocrinology, diabetes & metabolism physician records in California
John M. Tsao, MD is one of 1,131 endocrinology, diabetes & metabolism physician records with a practice address in California. 84% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2013 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Torrance → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Cathy Doria-Medina, M.D.Torrance, CA 905031982661591
- Steffan Havas, M.D.Torrance, CA 905031841266707
- Hae Seung Lee, M.D.Torrance, CA 905031477971331
- Alicia Lee, M.D.Torrance, CA 905031184150492
- Prativa Rajbhandari, MDTorrance, CA 905031659628667
- Tatiana Sams, MDTorrance, CA 905031174815427
- Rajesh Garg, MDTorrance, CA 905021609863190
- Anahita Ghazi, M.D.Torrance, CA 905021588385322
Common questions
What is John M. Tsao, MD's NPI number?
John M. Tsao, MD's National Provider Identifier (NPI) is 1194736082, issued on Aug 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John M. Tsao, MD located?
The NPPES record lists a practice address at 20911 Earl St Ste 340, Torrance, CA, 90503. Phone: (310) 542-6333. Providers update this record themselves, so call before visiting.
How can I verify John M. Tsao, MD's license?
NPPES lists California license number C23235, 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 John M. Tsao, MD prescribe under Medicare Part D?
In 2024, John M. Tsao, MD had 45 Medicare Part D claims; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.