Bryn James Duffy, MD
Internal Medicine Physician · San Rafael, CA
Bryn James Duffy, MD is an internal medicine physician with a practice address in San Rafael, California, and NPI 1235243775, issued on Aug 19, 2006. Check the license (California A110571, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Bryn James Duffy
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A110571 CA
Self-reported in NPPES; status is on the state search - Practice location
- 16 Bolanos Dr, San Rafael, CA 94903
- Phone
- (415) 306-1560
- Enumerated
- Aug 19, 2006
- Record last updated
- Feb 1, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Bryn James Duffy in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A110571Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bryn James Duffy among 17,696 internal medicine physician records in California
Bryn James Duffy, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileNo · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2010 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
51 internal medicine physician records list a practice address in San Rafael
They are 51 of the 3,159 NPPES records with a practice address in San Rafael, and 17,696 internal medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 17,696 in California → Every provider in San Rafael → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Patricia Bauman, M.D.San Rafael, CA 949031710077482
- Jill Dunton, MDSan Rafael, CA 949031588748552
- Joseph Habis, M.D.San Rafael, CA 949031760439681
- Jeffrey Harris, MDSan Rafael, CA 949031134203136
- Alpana Kharkar, MDSan Rafael, CA 949031982788055
- Steven Killpack, MDSan Rafael, CA 949031477651149
- Alan Kneitel, MDSan Rafael, CA 949031417031584
- William Leggett, MDSan Rafael, CA 949031215011283
Common questions
What is Bryn James Duffy, MD's NPI number?
Bryn James Duffy, MD's National Provider Identifier (NPI) is 1235243775, issued on Aug 19, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Bryn James Duffy, MD located?
The NPPES record lists a practice address at 16 Bolanos Dr, San Rafael, CA, 94903. Phone: (415) 306-1560. Providers update this record themselves, so call before visiting.
How can I verify Bryn James Duffy, MD's license?
NPPES lists California license number A110571, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.