Masaharu Osato, M.D.
Gastroenterology Physician · Torrance, CA
Masaharu Osato, M.D. is a gastroenterology physician with a practice address in Torrance, California, and NPI 1265470280, issued on Jun 3, 2006. Check the license (California G060449, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Masaharu Osato
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- G060449 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2860 Sepulveda Blvd, Torrance, CA 90505
- Phone
- (310) 534-8200
- Enumerated
- Jun 3, 2006
- Record last updated
- Mar 1, 2026
- Fax
- (310) 534-8200
- Medicare enrollment
- Enrolled (PECOS I20050408000978); accepts Medicare assignment
- Medical or professional school
- Loma Linda University School Of Medicine, 1983
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 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
- Kazumasa OsatoInternal Medicine Physician1134748015
- Allen Pachtman, M.D.Internal Medicine Physician1225110802
Verify Masaharu Osato in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G060449Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 100% of the cost of the top drugs
43 Medicare Part D claims for 26 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 88% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Shingrix31 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: $29.00
1 payment: food and beverage; the largest payer was Abbott Laboratories. The 13,350 providers of this specialty with any payment received $5,015.95 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).
Masaharu Osato among 2,140 gastroenterology physician records in California
Masaharu Osato, M.D. is one of 2,140 gastroenterology 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 7% of them.
- NPI issued2006 · 7% of these records are older, 48% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated1983 · median 2002 among the 1,538 with a school on file
- Record last updated2026 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in Torrance → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Susanna Chan, M.D.Torrance, CA 905051497794283
- David Chung, MDTorrance, CA 905051851362974
- Karl Fukunaga, MDTorrance, CA 905051487644613
- Thai Ha, MDTorrance, CA 905051174512172
- Kenneth Holt, MDTorrance, CA 905051932198108
- Tonny Lee, M.D.Torrance, CA 905051639118748
- Norman Panitch, MDTorrance, CA 905051306881487
- Chirag Patel, MDTorrance, CA 905051457307142
Common questions
What is Masaharu Osato, M.D.'s NPI number?
Masaharu Osato, M.D.'s National Provider Identifier (NPI) is 1265470280, issued on Jun 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Masaharu Osato, M.D. 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 Masaharu Osato, M.D.'s license?
NPPES lists California license number G060449, 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 Masaharu Osato, M.D. prescribe under Medicare Part D?
In 2024, Masaharu Osato, M.D. had 43 Medicare Part D claims for 26 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.