Ralph Maximillian Koenker, M.D.
Diagnostic Radiology Physician · Greenbrae, CA
Ralph Maximillian Koenker, M.D. is a diagnostic radiology physician with a practice address in Greenbrae, California, and NPI 1891734265, issued on Jun 4, 2006. Check the license (California G60981, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ralph Maximillian Koenker
- Credential
- M.D.
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License number
- G60981 CA
Self-reported in NPPES; status is on the state search - Practice location
- 250 Bon Air RD, Greenbrae, CA 94904
- Phone
- (415) 925-7000
- Enumerated
- Jun 4, 2006
- Record last updated
- Jun 28, 2026
- Medicaid ID
- 00G609810 CA
- Medicare enrollment
- Enrolled (PECOS I20060209000255); accepts Medicare assignment
- Medical or professional school
- University Of California, San Diego School Of Medicine, 1985
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 250 Bon Air RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lisa Abrahams, MFTMarriage & Family Therapist1184738445
- Jory Adam, PA-CSurgical Physician Assistant1922269521
- Samuel Adams, MDHospitalist Physician1497785034
- Barbara Addleman, RNRegistered Nurse1053551267
- Linda Alexander, RNPsychiatric/Mental Health Registered Nurse1205589405
- Maxwell AlikinneyCounselor1538668728
Verify Ralph Maximillian Koenker in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G60981Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 94.8 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $162.41
1 payment: food and beverage; the largest payer was Inari Medical, Inc. The 8,048 providers of this specialty with any payment received $2,488.38 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.
Bills Medicare through 2 group practices
- California Advanced Imaging Medical Associates IncNovato, CA
- Prima Medical FoundationGreenbrae, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ralph Maximillian Koenker among 4,500 diagnostic radiology physician records in California
Ralph Maximillian Koenker, M.D. is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1985 · median 2004 among the 3,130 with a school on file
- Record last updated2026 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
13 diagnostic radiology physician records list a practice address in Greenbrae
They are 13 of the 727 NPPES records with a practice address in Greenbrae, and 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in Greenbrae → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- William Demartini, M.D.Greenbrae, CA 949041427091016
- Russell Fritz, M.D.Greenbrae, CA 949041679550032
- Chad Goodman, M.D.Greenbrae, CA 949041386686525
- Susan Gootnick, M.D.Kentfield, CA 949041386714905
- Donna Hoghooghi, M.D.Greenbrae, CA 949041295781201
- Betsy Holland, M.D.Greenbrae, CA 949041659357481
- Jay Kaiser, M.D.Greenbrae, CA 949041275519001
- Philip Kurzman, M.D.Greenbrae, CA 949041346424991
Common questions
What is Ralph Maximillian Koenker, M.D.'s NPI number?
Ralph Maximillian Koenker, M.D.'s National Provider Identifier (NPI) is 1891734265, issued on Jun 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ralph Maximillian Koenker, M.D. located?
The NPPES record lists a practice address at 250 Bon Air RD, Greenbrae, CA, 94904. Phone: (415) 925-7000. Providers update this record themselves, so call before visiting.
How can I verify Ralph Maximillian Koenker, M.D.'s license?
NPPES lists California license number G60981, 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.
What is Ralph Maximillian Koenker, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.8 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.