Kazumasa Osato
Internal Medicine Physician · Torrance, CA
Kazumasa Osato is an internal medicine physician with a practice address in Torrance, California, and NPI 1134748015, issued on Apr 10, 2020. Check the license (California 188521, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Kazumasa Osato
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 188521 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2860 Sepulveda Blvd, Torrance, CA 90505
- Phone
- (310) 534-8200
- Enumerated
- Apr 10, 2020
- Record last updated
- Feb 3, 2024
- Medicare enrollment
- Enrolled (PECOS I20231017003654); accepts Medicare assignment
- 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 2860 Sepulveda Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Ariba Masood, MDInternal Medicine Physician1730708603
- Masaharu Osato, M.D.Gastroenterology Physician1265470280
- Allen Pachtman, M.D.Internal Medicine Physician1225110802
Verify Kazumasa Osato in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 188521Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
81% fewer Medicare Part D claims than the average internal medicine physician in 2024
590 Medicare Part D claims for 153 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims.
Most prescribed
- Atorvastatin Calcium70 claims
- Amlodipine Besylate46 claims
- Losartan Potassium31 claims
- Rosuvastatin Calcium27 claims
- Simvastatin24 claims
- Metformin Hcl23 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.
Industry payments in 2024: $547.30
23 payments; by number, the most common kind was food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Bills Medicare through one group practice
- Osato Medical Clinic IncTorrance, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Kazumasa Osato among 17,696 internal medicine physician records in California
Kazumasa Osato 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 2020, is newer than 89% of them.
- NPI issued2020 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2019 · median 2004 among the 11,065 with a school on file
- Record last updated2024 · 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).
231 internal medicine physician records list a practice address in Torrance
They are 231 of the 8,901 NPPES records with a practice address in Torrance, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Torrance → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Tanya Arvan, MDTorrance, CA 905051104827666
- Madhu Chatwani, M.D.Torrance, CA 905051215993894
- James Ding, MDTorrance, CA 905051285614636
- Vadim Fanous, MDTorrance, CA 905051457329716
- Tyler Jung, M.D.Torrance, CA 905051194791772
- Chong Kim, MDTorrance, CA 905051528034485
- Janet Lee, D.O.Torrance, CA 905051205826633
- Thomas Lee, M.D.Torrance, CA 905051609842079
Common questions
What is Kazumasa Osato's NPI number?
Kazumasa Osato's National Provider Identifier (NPI) is 1134748015, issued on Apr 10, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Kazumasa Osato located?
The NPPES record lists a practice address at 2860 Sepulveda Blvd, Torrance, CA, 90505. Phone: (310) 534-8200. Providers update this record themselves, so call before visiting.
How can I verify Kazumasa Osato's license?
NPPES lists California license number 188521, 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 Kazumasa Osato prescribe under Medicare Part D?
In 2024, Kazumasa Osato had 590 Medicare Part D claims for 153 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.