Arthur M. Inoshita, MD
Internal Medicine Physician · Ventura, CA
Arthur M. Inoshita, MD is an internal medicine physician with a practice address in Ventura, California, and NPI 1932105277, issued on Jun 22, 2005. Check the license (California 39112230, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Arthur M. Inoshita
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 39112230 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3003 Loma Vista RD, Ventura, CA 93003
- Phone
- (805) 652-1520
- Enumerated
- Jun 22, 2005
- Record last updated
- Sep 7, 2023
- Fax
- (805) 652-1588
- Medicaid ID
- 00G336221 CA
- Medicare enrollment
- Enrolled (PECOS I20100923001193); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 1975
- 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 3003 Loma Vista RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Arthur M. Inoshita in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 39112230Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.0 times the Medicare Part D claims of the average internal medicine physician in 2024
6,491 Medicare Part D claims for 374 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 223 claims were for opioids.
Most prescribed
- Atorvastatin Calcium357 claims
- Levothyroxine Sodium258 claims
- Losartan Potassium230 claims
- Amlodipine Besylate193 claims
- Eliquis150 claims
- Gabapentin142 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.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $687.60
19 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. 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.
Arthur M. Inoshita among 17,696 internal medicine physician records in California
Arthur M. Inoshita, MD 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 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 95% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1975 · median 2004 among the 11,065 with a school on file
- Record last updated2023 · 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).
68 internal medicine physician records list a practice address in Ventura
They are 68 of the 4,435 NPPES records with a practice address in Ventura, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Ventura → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Deborah Carlson, M.D.Ventura, CA 930031942231121
- James Estes, M.D.Ventura, CA 930031336176098
- Doina Galiatzatos, M.D.Ventura, CA 930031548206089
- Scott Goodfriend, M.D.Ventura, CA 930031982636965
- Albert Kam, M.D.Ventura, CA 930031114953593
- Karen Lockwood, MDVentura, CA 930031558330399
- James Mitchell, MDVentura, CA 930031598705485
- Charles Pankratz, M.D.Ventura, CA 930031689610511
Common questions
What is Arthur M. Inoshita, MD's NPI number?
Arthur M. Inoshita, MD's National Provider Identifier (NPI) is 1932105277, issued on Jun 22, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Arthur M. Inoshita, MD located?
The NPPES record lists a practice address at 3003 Loma Vista RD, Ventura, CA, 93003. Phone: (805) 652-1520. Providers update this record themselves, so call before visiting.
How can I verify Arthur M. Inoshita, MD's license?
NPPES lists California license number 39112230, 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 Arthur M. Inoshita, MD prescribe under Medicare Part D?
In 2024, Arthur M. Inoshita, MD had 6,491 Medicare Part D claims for 374 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Arthur M. Inoshita, MD's MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
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.