Brian D. Hertz, MD
Family Medicine Physician · San Rafael, CA
Brian D. Hertz, MD is a family medicine physician with a practice address in San Rafael, California, and NPI 1831273812, issued on Oct 25, 2006. Check the license (California G86565, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Brian D. Hertz
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- G86565 CA
042-0015837 VT
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
- May 12, 2022
- Medicaid ID
- 00G865650 CA
- Medicare enrollment
- Enrolled (PECOS I20220523001393); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1984
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 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.
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Verify Brian D. Hertz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G86565Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
56% fewer Medicare Part D claims than the average family medicine physician in 2024
1,568 Medicare Part D claims for 428 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. 38 claims were for opioids.
Most prescribed
- Atorvastatin Calcium85 claims
- Gabapentin83 claims
- Lisinopril78 claims
- Fluticasone Propionate59 claims
- Losartan Potassium46 claims
- Amlodipine Besylate43 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 2 group practices
- Central Vermont Medical Center IncWaitsfield, VT
- Petaluma Health Center IncPetaluma, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Brian D. Hertz among 17,133 family medicine physician records in California
Brian D. Hertz, MD is one of 17,133 family medicine physician records with a practice address in California. 81% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated1984 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
37 family medicine physician records list a practice address in San Rafael
They are 37 of the 3,159 NPPES records with a practice address in San Rafael, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Rafael → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Charles Calza, M.D.San Rafael, CA 949031629081161
- John Clothier, M.D.San Rafael, CA 949031750431250
- Marissa Fernandez Kiemele, MDSan Rafael, CA 949031144297516
- Orna Hananel, MDSan Rafael, CA 949031497839484
- Ann Hathaway, MDSan Rafael, CA 949031093893752
- Meenal Lohtia, M.D.San Rafael, CA 949031205883121
- Sarah Mansell, MDSan Rafael, CA 949031548332364
- Drew MarisSan Rafael, CA 949031467538397
Common questions
What is Brian D. Hertz, MD's NPI number?
Brian D. Hertz, MD's National Provider Identifier (NPI) is 1831273812, issued on Oct 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Brian D. Hertz, 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 Brian D. Hertz, MD's license?
NPPES lists California license number G86565, 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 Brian D. Hertz, MD prescribe under Medicare Part D?
In 2024, Brian D. Hertz, MD had 1,568 Medicare Part D claims for 428 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.