Dr. Masaharu M. Osato, MD
- Medicare services, 2024
- 9,236
- Medicare patients, 2024
- 302
- Part D claims, 2024
- 43
- Industry payments
- $1,581
- Affiliated sites
- 1
- Practice address
- 3440 Lomita Blvd, Torrance, CA 90505
- Practice phone
- Call (310) 534-8200
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Osato Surgical Center
Torrance, California
Find Dr. Osato's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Masaharu M. Osato is a gastroenterologist in Torrance, California
Dr. Osato practices at Osato Surgical Center in Torrance, California.
Dr. Osato's NPI, 1265470280, was assigned on June 3, 2006. Dr. Osato graduated from Loma Linda University School of Medicine in 1983. Dr. Osato holds California license G060449.
- NPI
- 1265470280NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6901843192
- NPI enumeration date
- June 3, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 534-8200
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 69
- Medical school graduation
- 1983
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Masaharu M. Osato practices at Osato Surgical Center in Torrance, California
Dr. Osato's primary practice is Osato Surgical Center, at 3440 Lomita Blvd, Torrance, CA 90505 in Los Angeles County. The practice phone is (310) 534-8200.
- Osato Surgical Center3440 Lomita Blvd, Torrance, CA 90505 · Los Angeles CountyPhone(310) 534-8200
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Masaharu M. Osato is affiliated with 2 sites of care and 1 medical group
Dr. Osato's primary practice is Osato Surgical Center in Torrance, California. The medical group on file is Osato Medical Clinic. Dmand AI also links Dr. Osato to 1 more ambulatory surgery center, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Masaharu M. Osato's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Osato practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Osato Surgical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Masaharu M. Osato is one of 1,977 gastroenterologists in California
Gastroenterology is Dr. Osato's primary specialty in the NPI Registry, under taxonomy code 207RG0100X. Dr. Osato is licensed in California.
Specialties and state licenses
- Gastroenterology, CaliforniaPrimary
Gastroenterologists near Dr. Osato
Counts of gastroenterologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Masaharu M. Osato billed Medicare for 9,236 services in 2024
CMS data shows 9,236 Medicare services from Dr. Osato across 30 procedure codes in 2024, for 302 Medicare patients. Medicare paid $234,301 for them. Every service was in an office.
Dr. Osato's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Drugs given in the office
- 2023: 4,6202024: 4,9206%
- Lab and pathology
- 2023: 1,6102024: 2,21337%
- Office and hospital visits
- 2023: 6902024: 1,12663%
- Surgery
- 2023: 3462024: 55962%
- Tests and treatments
- 2023: 2302024: 19217%
- Imaging
- 2023: 1222024: 14216%
- Other services
- 2023: 1002024: 8416%
Dr. Osato compared with the California median for gastroenterologists, 2024
- Dr. Osato
- California median
- Medicare services
- 9,236vs 58615.8 times
- Medicare patients
- 302vs 302Close to median
- Part D claims
- 31vs 38092% below
Medians across 1,875 gastroenterologists in California with Dmand AI profiles that report each measure.
Dr. Osato's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Osato and other gastroenterologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Masaharu M. Osato treated 302 Medicare patients in 2024, average age 78
CMS counts 302 Medicare patients who saw Dr. Osato in 2024. The largest group is 75 to 84, with 124 patients. 75% of them have high cholesterol, and 72% have high blood pressure. Their average risk score is 0.72, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Osato's median patient age at 50, with 74% women.
Dr. Osato's Medicare patients by age, 2024
Dr. Osato's Medicare patients by sex, 2024
- Women16555%
- Men13745%
Chronic conditions among Dr. Osato's Medicare patients, 2024
- High cholesterol75%
- High blood pressure72%
- Diabetes25%
- Osteoporosis25%
- Arthritis22%
- Cancer15%
- Chronic kidney disease13%
- Ischemic heart disease11%
Share of Medicare patients with each condition. A patient can have several.
Dr. Osato's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 50
Patient panel by sex, all payers
- Women74%
- Men24%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Masaharu M. Osato wrote 43 Medicare Part D claims in 2024
In 2024, Dr. Osato wrote 43 Medicare Part D claims for 26 patients. CMS names the drug for 31 of them, across 1 drug with 11 or more claims each, at $6,771 in total drug cost. In 2023, CMS named 47 claims across 1 drug.
Dr. Osato's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 472024: 3134%
Drugs named by CMS: 1 in 2024, 1 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Masaharu M. Osato takes part in Medicare
Dr. Osato accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Masaharu M. Osato received $1,581 in industry payments from 2016 to 2024
CMS Open Payments shows 81 general payments to Dr. Osato from 15 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 94% of the total. Merck Sharp & Dohme Corporation paid the most, $394.
General payments to Dr. Osato by program year, 2016 to 2024
General payments to Dr. Osato by kind, 2016 to 2024
- Food and beverage$1,49094%
- Gifts$825%
- Education$91%
Companies that paid Dr. Osato the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Masaharu M. Osato graduated from Loma Linda University School of Medicine
Dr. Osato graduated from Loma Linda University School of Medicine in 1983.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Masaharu M. Osato's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Masaharu M. Osato
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Masaharu M. Osato's NPI number?
Dr. Masaharu M. Osato's NPI number is 1265470280. It was assigned on June 3, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Masaharu M. Osato?
Dr. Masaharu M. Osato is a gastroenterologist in Torrance, California. The primary specialty in the NPI Registry is Gastroenterology Physician (taxonomy code 207RG0100X).
Where does Dr. Masaharu M. Osato practice?
Dr. Osato practices at 3440 Lomita Blvd, Torrance, CA 90505. Dr. Osato's primary practice is Osato Surgical Center in Torrance, California. Dmand AI also links Dr. Osato to 1 ambulatory surgery center.
What is Dr. Masaharu M. Osato's office phone number?
The practice phone on file for Dr. Osato is (310) 534-8200.
What is Dr. Masaharu M. Osato's medical license number?
Dr. Osato holds California license G060449.
What medical group is Dr. Masaharu M. Osato part of?
Dr. Osato is linked to Osato Medical Clinic.
Does Dr. Masaharu M. Osato accept Medicare?
Yes. CMS data shows Dr. Osato billed Medicare for 9,236 services in 2024, and Dr. Osato accepts Medicare assignment.
How many Medicare patients does Dr. Masaharu M. Osato see?
CMS counts 302 Medicare patients who saw Dr. Osato in 2024, with an average age of 78.
What services does Dr. Masaharu M. Osato bill to Medicare?
In 2024, Dr. Osato's most billed Medicare services were injected or infused drug (J0897), surgery: heart and blood vessels (36415) and office visit, established patient (99214).
Where did Dr. Masaharu M. Osato go to medical school?
Dr. Osato graduated from Loma Linda University School of Medicine in 1983.
Show 3 more questionsShow fewer questions
What drugs does Dr. Masaharu M. Osato prescribe most?
In 2024 Medicare Part D data, Dr. Osato's most prescribed drugs by claims were Shingrix.
Has Dr. Masaharu M. Osato received payments from drug or device companies?
CMS Open Payments shows $1,581 in general payments to Dr. Osato from 15 companies from 2016 to 2024. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. Masaharu M. Osato been practicing?
Dr. Osato graduated from medical school in 1983, 43 years ago.
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