Arthur M. Inoshita, MD
NPI 1932105277ActiveIndividual· Internal Medicine· Ventura, CA
Internal Medicine (MD) in Ventura, California, trained at University of Arizona College of Medicine (class of 1975). Their prescriptions cost Medicare Part D more than their services did: $585,572 for 6,491 claims, against $142,591 paid for services in 2024. Amgen Inc. was the largest of 9 companies reporting payments in 2025, $934.22 in all, mostly food and beverage.
Overview
| NPI | 1932105277 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 22, 2005 |
| Last updated in NPPES | Sep 7, 2023 |
| Reactivated | May 5, 2006 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 39112230 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 289 |
|---|---|
| Services billed | 1,714 across 19 procedure codes |
| Paid by Medicare | $142,591 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,491 · 12,639 30-day fills |
|---|---|
| Patients | 374 |
| Total drug cost | $585,572 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of Arizona College of Medicine |
|---|---|
| Graduation year | 1975 |
| Medicare specialty | Internal Medicine |
| Secondary specialties | Geriatric Medicine |
| Telehealth | Offers telehealth |
Hospital affiliation
- Community Memorial Hospital - VenturaVentura, CA
Other facilities
- Assisted Home CareHome health agency · Ventura, CA
- Las Posas Home Health ServicesHome health agency · Camarillo, CA
- Los Robles HealthcareHome health agency · Thousand Oaks, CA
- Mission Home Health of Ventura, LLCHome health agency · Oxnard, CA
- We Care Home Health, IncHome health agency · Van Nuys, CA
- Ojai Health & RehabilitationNursing home · Ojai, CA
Industry payments (Open Payments)
- 2025$934.22 · 21 payments from 9 companies
- 2024$687.60 · 19 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $377.92 | 6 |
| Merck Sharp & Dohme LLC | $167.12 | 4 |
| Novo Nordisk Inc | $141.96 | 2 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $93.36 | 3 |
| Astrazeneca Pharmaceuticals LP | $42.18 | 2 |
What the 2025 payments were for
- Food and Beverage$927.14 · 20 payments
- Education$7.08 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 77 internal medicine physicians in Ventura · All internal medicine physicians in California