Robert J. Marsan, M.D.
Emergency Medicine Physician · San Diego, CA
Robert J. Marsan, M.D. is an emergency medicine physician with a practice address in San Diego, California, and NPI 1780766279, issued on Oct 20, 2006. Check the license (California A92679, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert J. Marsan
- Credential
- M.D.
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- A92679 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2001 4TH Ave, San Diego, CA 92101
- Phone
- (619) 499-2777
- Enumerated
- Oct 20, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200326003439); accepts Medicare assignment
- Medical or professional school
- Perelman School Of Med At The University Of Pennsylvania, 2004
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 7,751 in California → Look up another NPI →
Also registered at 2001 4TH Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Robyn Bodecker, PA-CPhysician Assistant1427067727
Verify Robert J. Marsan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A92679Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
32% fewer Medicare Part D claims than the average emergency medicine physician in 2024
153 Medicare Part D claims for 107 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D. 14 claims were for opioids.
Most prescribed
- Prednisone17 claims
- Cephalexin16 claims
- Doxycycline Monohydrate14 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
- Copley Hospital IncMorrisville, VT
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert J. Marsan among 7,751 emergency medicine physician records in California
Robert J. Marsan, 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
- Graduated2004 · 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).
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 Diego → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- Colleen Buono, MDSan Diego, CA 921011467494179
- Shauna Conry, M.D.San Diego, CA 921011285877787
- Richard Gwinn, M.D.San Diego, CA 921011265442727
- Timothy Hinman, M.D.San Diego, CA 921011003896945
- Mamata Kene, M.D.San Diego, CA 921011407066111
- Gene Lee, MDSan Diego, CA 921011316026461
- Ryan Limberg, MDSan Diego, CA 921011871752816
- Julie Marmon, M.D.San Diego, CA 921011154538957
Common questions
What is Robert J. Marsan, M.D.'s NPI number?
Robert J. Marsan, M.D.'s National Provider Identifier (NPI) is 1780766279, issued on Oct 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert J. Marsan, M.D. located?
The NPPES record lists a practice address at 2001 4TH Ave, San Diego, CA, 92101. Phone: (619) 499-2777. Providers update this record themselves, so call before visiting.
How can I verify Robert J. Marsan, M.D.'s license?
NPPES lists California license number A92679, 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 J. Marsan, M.D. prescribe under Medicare Part D?
In 2024, Robert J. Marsan, M.D. had 153 Medicare Part D claims for 107 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.