Ralph Koenker, M.D.
NPI 1891734265 · Diagnostic Radiology Physician · Novato, CA
Enrolled with Medicare as Practitioner - Diagnostic Radiology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ralph Koenker, M.D. is a Diagnostic Radiology Physician provider in Novato, CA (NPI 1891734265).
Provider details
- NPI number
- 1891734265
- Entity type
- Individual
- Primary specialty
- Diagnostic Radiology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G60981 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
6,755 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| X-Ray of Chest, 1 View71045 | 1,092 | $10 |
| Ct Scan Head Or Brain Without Contrast70450 | 480 | $46 |
| Ct Scan of Abdomen and Pelvis With Contrast74177 | 268 | $100 |
| Screening 3d Breast Mammography77063 | 243 | $33 |
| Screening Mammography77067 | 243 | $43 |
| X-Ray of Chest, 2 Views71046 | 208 | $12 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$162 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-04
- Last updated
- 2012-03-07
Frequently asked questions
- What is Ralph Koenker's NPI number?
- Ralph Koenker's National Provider Identifier (NPI) is 1891734265, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ralph Koenker's specialty?
- Ralph Koenker is listed in the NPPES registry with a primary specialty of Diagnostic Radiology Physician (Allopathic & Osteopathic Physicians).
- Where is Ralph Koenker located?
- Ralph Koenker's practice location on file with NPPES is 180 Rowland Way, Novato, CA 94945-5009.
- What is Ralph Koenker's phone number?
- The practice phone number listed in the NPPES registry for Ralph Koenker is (415) 290-1500.
- Does Ralph Koenker accept Medicare?
- Ralph Koenker is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ralph Koenker's NPI active?
- Yes — Ralph Koenker's NPI (1891734265) is active in the NPPES registry as of the last update on 2012-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.