Robert Blair Ash, MD
NPI 1326238650ActiveIndividual· Radiology, Radiation Oncology· Orange, CA
Radiology, Radiation Oncology (MD) with City of Hope Medical Foundation, practicing in Orange, California. In 2024 Medicare paid $142,808 for 204 patients, and Part D covered 216 of their prescriptions, 82% of them generic. Monteris Medical Corporation was the largest of 4 companies reporting payments in 2025, $280.42 in all, mostly food and beverage. Lists Providence St. Joseph Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1326238650 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 1, 2007 |
| Last updated in NPPES | Nov 11, 2020 |
| Certified by provider | Nov 11, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Radiation Oncology Primary | 2085R0001X | C52450 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Radiation Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 204 |
|---|---|
| Services billed | 1,931 across 30 procedure codes |
| Paid by Medicare | $142,808 |
Part D prescriptions in 2024
| Prescriptions (claims) | 216 · 299 30-day fills |
|---|---|
| Patients | 106 |
| Total drug cost | $1,881 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Radiation Oncology |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliations
- Providence St. Joseph HospitalOrange, CA
- Providence St. Jude Medical CenterFullerton, CA
- Uci Health-OrangeOrange, CA
Industry payments (Open Payments)
- 2025$280.42 · 5 payments from 4 companies
- 2024$22.63 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Monteris Medical Corporation | $130.37 | 1 |
| Boston Scientific Corporation | $94.02 | 1 |
| Teleflex LLC | $36.92 | 2 |
| Novocure Inc. | $19.11 | 1 |
What the 2025 payments were for
- Food and Beverage$280.42 · 5 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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