Ralph Maximillian Koenker, M.D.
NPI 1891734265ActiveIndividual· Radiology, Diagnostic Radiology· Greenbrae, CA
Radiology, Diagnostic Radiology (M.D.) in Greenbrae, California, trained at University of California, San Diego School of Medicine (class of 1985). Medicare paid $229,599 for services to 4,159 patients in 2024. Boston Scientific Corporation reported $109.06 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1891734265 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 4, 2006 |
| Last updated in NPPES | Jun 28, 2026 |
| Certified by provider | Jun 28, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Radiology, Diagnostic Radiology Primary | 2085R0202X | G60981 | CA |
| Radiology, Neuroradiology | 2085N0700X | G60981 | CA |
| Radiology, Vascular & Interventional Radiology | 2085R0204X | G60981 | 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 - Diagnostic Radiology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 4,159 |
|---|---|
| Services billed | 7,386 across 258 procedure codes |
| Paid by Medicare | $229,599 |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 1985 |
| Medicare specialty | Diagnostic Radiology |
| Secondary specialties | Interventional Radiology |
Medical groups
- California Advanced Imaging Medical Associates IncSan Francisco, CA · 88 clinicians
- Prima Medical FoundationGreenbrae, CA · 31 clinicians
Hospital affiliations
- Marinhealth Medical CenterGreenbrae, CA
- Novato Community HospitalNovato, CA
- Providence Queen of the Valley Medical CenterNapa, CA
- Sonoma Valley HospitalSonoma, CA
- UCSF Medical CenterSan Francisco, CA
Industry payments (Open Payments)
- 2025$109.06 · 1 payment from 1 company
- 2024$162.41 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Boston Scientific Corporation | $109.06 | 1 |
What the 2025 payments were for
- Food and Beverage$109.06 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 15 diagnostic radiologists in Greenbrae · All diagnostic radiologists in California