Jennifer Grayzar, M.D.
Emergency Medicine Physician · San Rafael, CA
Jennifer Grayzar, M.D. is an emergency medicine physician with a practice address in San Rafael, California, and NPI 1336160530, issued on Jul 22, 2006. Check the license (California A65858, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jennifer Grayzar
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A65858 CA
Self-reported in NPPES; status is on the state search - Practice location
- 4000 Civic Center Dr Ste 206, San Rafael, CA 94903
- Phone
- (415) 925-8865
- Enumerated
- Jul 22, 2006
- Record last updated
- Aug 13, 2025
- Medicaid ID
- 00A658580 CA
- Medicare enrollment
- Enrolled (PECOS I20080611000308); may accept Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 1994
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 4000 Civic Center Dr Ste 206
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jennifer Grayzar in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A65858Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
14% fewer Medicare Part D claims than the average emergency medicine physician in 2024
194 Medicare Part D claims for 146 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 19 claims were for opioids.
Most prescribed
- Cephalexin34 claims
- Prednisone19 claims
- Hydrocodone-Acetaminophen14 claims
- Amoxicillin-Clavulanate Potass13 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 94.6 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).
Bills Medicare through one group practice
- Regents Univ OF California UcsfSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jennifer Grayzar among 7,751 emergency medicine physician records in California
Jennifer Grayzar, M.D. is one of 7,751 emergency 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 4% of them.
- NPI issued2006 · 4% of these records are older, 60% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1994 · median 2011 among the 4,560 with a school on file
- Record last updated2025 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Emergency Medicine Physician providers in California
There are 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in San Rafael → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Morgan Camp, MDSan Rafael, CA 949031407845738
- Cynthia Clark, MDSan Rafael, CA 949031144219767
- John David, MDSan Rafael, CA 949031912081993
- Anna Denham, MDSan Rafael, CA 949031750465738
- Douglas Harris, MDSan Rafael, CA 949031073697066
- Kurt Kunzel, MDSan Rafael, CA 949031073502696
- Frederick Meyer, MDSan Rafael, CA 949031780768788
- Seth Peckler, MDSan Rafael, CA 949031285718262
Common questions
What is Jennifer Grayzar, M.D.'s NPI number?
Jennifer Grayzar, M.D.'s National Provider Identifier (NPI) is 1336160530, issued on Jul 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jennifer Grayzar, M.D. located?
The NPPES record lists a practice address at 4000 Civic Center Dr Ste 206, San Rafael, CA, 94903. Phone: (415) 925-8865. Providers update this record themselves, so call before visiting.
How can I verify Jennifer Grayzar, M.D.'s license?
NPPES lists California license number A65858, 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 Jennifer Grayzar, M.D. prescribe under Medicare Part D?
In 2024, Jennifer Grayzar, M.D. had 194 Medicare Part D claims for 146 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Jennifer Grayzar, M.D.'s MIPS final score?
The 2023 MIPS final score is 94.6 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.