Robert E. Marshall, MD
Internal Medicine Physician · South San Francisco, CA
Robert E. Marshall, MD is an internal medicine physician with a practice address in South San Francisco, California, and NPI 1801960117, issued on Nov 20, 2006. Check the license (California G77466, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Robert E. Marshall
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G77466 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 20, 2006
- Record last updated
- Dec 29, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G774660 CA
- Medicare enrollment
- Enrolled (PECOS I20110104001313); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Human Medicine, 1992
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 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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- Jason Anderson, MDHospitalist Physician1831277466
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Verify Robert E. Marshall in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G77466Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
7,965 Medicare Part D claims for 703 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 359 claims were for opioids.
Most prescribed
- Atorvastatin Calcium703 claims
- Losartan Potassium431 claims
- Amlodipine Besylate263 claims
- Tamsulosin Hcl262 claims
- Atenolol248 claims
- Levothyroxine Sodium242 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
- Permanente Medical Group IncRedwood City, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert E. Marshall among 17,696 internal medicine physician records in California
Robert E. Marshall, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1992 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
63 internal medicine physician records list a practice address in South San Francisco
They are 63 of the 1,173 NPPES records with a practice address in South San Francisco, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in South San Francisco → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
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Common questions
What is Robert E. Marshall, MD's NPI number?
Robert E. Marshall, MD's National Provider Identifier (NPI) is 1801960117, issued on Nov 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert E. Marshall, 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 E. Marshall, MD's license?
NPPES lists California license number G77466, 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 E. Marshall, MD prescribe under Medicare Part D?
In 2024, Robert E. Marshall, MD had 7,965 Medicare Part D claims for 703 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.