John Benjamin Colby, MD, PHD
Neuroradiology Physician · Greenbrae, CA
John Benjamin Colby, MD, PHD is a neuroradiology physician with a practice address in Greenbrae, California, and NPI 1700205374, issued on Apr 10, 2014. Check the license (California A139185, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Benjamin Colby
- Credential
- MD, PHD
- Primary taxonomy
- Neuroradiology Physician 2085N0700X
- License number
- A139185 CA
Self-reported in NPPES; status is on the state search - Practice location
- 250 Bon Air RD, Greenbrae, CA 94904
- Phone
- (415) 925-7301
- Enumerated
- Apr 10, 2014
- Record last updated
- Jul 1, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200527000629); accepts Medicare assignment
- Medical or professional school
- University Of California, Geffen School Of Medicine, 2014
- Entity
- Type 1 · individual
8 nearest neuroradiology physician records → All 221 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 John Benjamin Colby in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A139185Check 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: $120.00
1 payment: food and beverage; the largest payer was Telix Pharmaceuticals. The 382 providers of this specialty with any payment received $10,885.19 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 IncSonoma, CA
- Prima Medical FoundationGreenbrae, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Benjamin Colby among 221 neuroradiology physician records in California
John Benjamin Colby, MD, PHD is one of 221 neuroradiology physician records with a practice address in California. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 75% of them.
- NPI issued2014 · 75% of these records are older, 21% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 78% of these records are
- Graduated2014 · median 2006 among the 172 with a school on file
- Record last updated2020 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085N0700X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neuroradiology Physician providers in California
There are 221 neuroradiology physician records in California.
All 221 in California → Every provider in Greenbrae → Neuroradiology Physician nationwide →
The 8 neuroradiology physician records with the nearest ZIP codes
- Hallie Whalen, MDSanta Clara, CA 950511932737939
- Stuart Mass, M.D.San Jose, CA 951241649289513
- Kenneth Ong, M.D.San Jose, CA 951241760492177
- Vivek Agrawal, MDSan Jose, CA 951281528160777
- Rajul Pandit, MDSan Jose, CA 951281356446835
- Mahesh Patel, MDSan Jose, CA 951281700842556
- Andrew Fenster, MDOakland, CA 946111932605193
- Kevin Terashima, MDOakland, CA 946111598269854
Common questions
What is John Benjamin Colby, MD, PHD's NPI number?
John Benjamin Colby, MD, PHD's National Provider Identifier (NPI) is 1700205374, issued on Apr 10, 2014. An NPI identifies a provider in billing; it is not a license.
Where is John Benjamin Colby, MD, PHD located?
The NPPES record lists a practice address at 250 Bon Air RD, Greenbrae, CA, 94904. Phone: (415) 925-7301. Providers update this record themselves, so call before visiting.
How can I verify John Benjamin Colby, MD, PHD's license?
NPPES lists California license number A139185, 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 John Benjamin Colby, MD, PHD'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.