Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Brian D. Hertz, MD

Individual provider Family Medicine Physician · NPI 1831273812

Brian D. Hertz, MD is registered under Family Practice in San Rafael, California. Graduated from University of Michigan Medical School in 1984, 42 years ago. Practices with Petaluma Health Center Inc, a 76-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in California and Vermont.

Years since qualifying
42
Trained at
University of Michigan Medical School
Licensed in
CA, VT
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

99 Montecillo Rd
San Rafael, CA 94903-3308
Phone: (415) 444-2000
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 859 Old County Rd, Waitsfield, VT 05673-6221 — (802) 496-3838

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G86565 (CA)
Family Medicine Physician Taxonomy 207Q00000X · Licence 042-0015837 (VT)

Record details

NPI number1831273812
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 25, 2006
Last updated in NPPESMay 12, 2022
Certification dateMay 12, 2022

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1984 (42 years in practice)
Group practice Petaluma Health Center Inc — 76 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients171
Services billed 262 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Petaluma Health Center Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 76 clinicians in the practice; 12 are shown here.

Other providers in San Rafael