Robert Andrew Zimmerman, MD
Emergency Medicine Physician · South San Francisco, CA
Robert Andrew Zimmerman, MD is an emergency medicine physician with a practice address in South San Francisco, California, and NPI 1275612301, issued on Nov 2, 2006. Check the license (California C42900, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert Andrew Zimmerman
- Credential
- MD
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- C42900 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1200 EL Camino Real, South San Francisco, CA 94080
- Phone
- (650) 742-2000
- Enumerated
- Nov 2, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicaid ID
- 00C429000 CA
- Medicare enrollment
- Enrolled (PECOS I20250115003669); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 1200 EL Camino Real
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Robert Andrew Zimmerman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license C42900Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.1 times the Medicare Part D claims of the average emergency medicine physician in 2024
476 Medicare Part D claims for 307 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. Brand-name drugs were 7% of claims. 37 claims were for opioids.
Most prescribed
- Ibuprofen57 claims
- Cefdinir36 claims
- Ondansetron Odt28 claims
- Gabapentin27 claims
- Hydrocodone-Acetaminophen24 claims
- Prednisone23 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): 80.7 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
- Alegent Creighton ClinicOmaha, NE
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Andrew Zimmerman among 7,751 emergency medicine physician records in California
Robert Andrew Zimmerman, MD 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
- Graduated1980 · median 2011 among the 4,560 with a school on file
- Record last updated2007 · 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).
23 emergency medicine physician records list a practice address in South San Francisco
They are 23 of the 1,173 NPPES records with a practice address in South San Francisco, and 7,751 emergency medicine physician records in California.
All 7,751 in California → Every provider in South San Francisco → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
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- Jeffrey Crowder, MDSouth San Francisco, CA 940801710065313
- Eric Dilda, MDSouth San Francisco, CA 940801386722999
- Elijah Edwards, MDSouth San Francisco, CA 940801538374160
- Jason Eiband, MDSouth San Francisco, CA 940801114005717
- Kim Feigon, MDSouth San Francisco, CA 940801609954254
Common questions
What is Robert Andrew Zimmerman, MD's NPI number?
Robert Andrew Zimmerman, MD's National Provider Identifier (NPI) is 1275612301, issued on Nov 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert Andrew Zimmerman, MD located?
The NPPES record lists a practice address at 1200 EL Camino Real, South San Francisco, CA, 94080. Phone: (650) 742-2000. Providers update this record themselves, so call before visiting.
How can I verify Robert Andrew Zimmerman, MD's license?
NPPES lists California license number C42900, 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 Robert Andrew Zimmerman, MD prescribe under Medicare Part D?
In 2024, Robert Andrew Zimmerman, MD had 476 Medicare Part D claims for 307 beneficiaries; the average among emergency medicine physician prescribers was 226. Part D covers Medicare prescriptions only.
What is Robert Andrew Zimmerman, MD's MIPS final score?
The 2023 MIPS final score is 80.7 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.