J. Brian Delfanti, MD
Otolaryngology Physician · San Rafael, CA
J. Brian Delfanti, MD is an otolaryngology physician with a practice address in San Rafael, California, and NPI 1356425425, issued on Oct 25, 2006. Check the license (California G55829, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- J. Brian Delfanti
- Credential
- MD
- Primary taxonomy
- Otolaryngology Physician 207Y00000X
- License number
- G55829 CA
Self-reported in NPPES; status is on the state search - Practice location
- 99 Montecillo RD, San Rafael, CA 94903
- Phone
- (415) 444-2000
- Enumerated
- Oct 25, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00G558290 CA
- Medicare enrollment
- Enrolled (PECOS I20101115001417); accepts Medicare assignment
- Medical or professional school
- Loyola University Of Chicago, Stritch School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest otolaryngology physician records → All 1,212 in California → Look up another NPI →
Also registered at 99 Montecillo RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Scott Adelman, MDCardiovascular Disease Physician1396829362
- Navid AfrahPhysical Therapist1275997017
- Omar Ahmed, PHARMDAmbulatory Care Pharmacist1285254037
- Mary Air, M.D.Physical Medicine & Rehabilitation Physician1376772913
- Tarik Alagha, MDInternal Medicine Physician1740869676
- Paul Alpert, MDUrology Physician1417031402
Verify J. Brian Delfanti in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G55829Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average otolaryngology physician in 2024
153 Medicare Part D claims for 76 beneficiaries, against an average of 541 among the 8,339 providers of this specialty who prescribed in Part D.
Most prescribed
- Fluticasone Propionate46 claims
- Hydrocortisone25 claims
- Famotidine19 claims
- Triamcinolone Acetonide14 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- North East Medical ServicesSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
J. Brian Delfanti among 1,212 otolaryngology physician records in California
J. Brian Delfanti, MD is one of 1,212 otolaryngology physician records with a practice address in California. 80% 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 · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated1984 · median 2004 among the 818 with a school on file
- Record last updated2007 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Y00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Otolaryngology Physician providers in California
There are 1,212 otolaryngology physician records in California.
All 1,212 in California → Every provider in San Rafael → Otolaryngology Physician nationwide →
The 8 otolaryngology physician records with the nearest ZIP codes
- Jeffrey Chien, MDSan Rafael, CA 949031770667776
- Thomas Guerry, MDSan Rafael, CA 949031457435430
- Gary Mizono, MDSan Rafael, CA 949031174607147
- Virginia Smith-Bronstein, M.D.San Rafael, CA 949031093159634
- Peter Vila, MD, MSPHSan Rafael, CA 949031437413945
- Romeo Agbayani, MDGreenbrae, CA 949041205909603
- Daniel Flis, M.D.Greenbrae, CA 949041316266042
- Kambridge Hribar, MDGreenbrae, CA 949041619100195
Common questions
What is J. Brian Delfanti, MD's NPI number?
J. Brian Delfanti, MD's National Provider Identifier (NPI) is 1356425425, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is J. Brian Delfanti, MD located?
The NPPES record lists a practice address at 99 Montecillo RD, San Rafael, CA, 94903. Phone: (415) 444-2000. Providers update this record themselves, so call before visiting.
How can I verify J. Brian Delfanti, MD's license?
NPPES lists California license number G55829, 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.
How much does J. Brian Delfanti, MD prescribe under Medicare Part D?
In 2024, J. Brian Delfanti, MD had 153 Medicare Part D claims for 76 beneficiaries; the average among otolaryngology physician prescribers was 541. Part D covers Medicare prescriptions only.
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.