Paul Marcus
Internal Medicine Physician · Palo Alto, CA
Paul Marcus is an internal medicine physician with a practice address in Palo Alto, California, and NPI 1386900959, issued on Apr 7, 2012. Check the license (California A128420, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Paul Marcus
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A128420 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3801 Miranda Ave # MC111, Palo Alto, CA 94304
- Phone
- (650) 493-5000
- Enumerated
- Apr 7, 2012
- Record last updated
- Feb 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20150821014388); accepts Medicare assignment
- Medical or professional school
- Ohio State University College Of Medicine, 2012
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Paul Marcus in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A128420Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average internal medicine physician in 2024
155 Medicare Part D claims for 53 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of 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 IncOakland, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Paul Marcus among 17,696 internal medicine physician records in California
Paul Marcus 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 2012, is newer than 68% of them.
- NPI issued2012 · 68% of these records are older, 29% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2012 · median 2004 among the 11,065 with a school on file
- Record last updated2022 · 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).
187 internal medicine physician records list a practice address in Palo Alto
They are 187 of the 7,617 NPPES records with a practice address in Palo Alto, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Palo Alto → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Arlina Ahluwalia, MDPalo Alto, CA 943041295723559
- Bankole Asebiomo, MDPalo Alto, CA 943041841301884
- Lisa Backus, MD PHDPalo Alto, CA 943041033152285
- Mina Charon, MDPalo Alto, CA 943041558349266
- Stephen Ezeji-Okoye, M.D.Palo Alto, CA 943041366493595
- Susan Frayne, MD, MPHPalo Alto, CA 943041952314890
- James Hallenbeck, MDPalo Alto, CA 943041316982358
- Rhonda Hamilton, M.D.Palo Alto, CA 943041225063241
Common questions
What is Paul Marcus's NPI number?
Paul Marcus's National Provider Identifier (NPI) is 1386900959, issued on Apr 7, 2012. An NPI identifies a provider in billing; it is not a license.
Where is Paul Marcus located?
The NPPES record lists a practice address at 3801 Miranda Ave # MC111, Palo Alto, CA, 94304. Phone: (650) 493-5000. Providers update this record themselves, so call before visiting.
How can I verify Paul Marcus's license?
NPPES lists California license number A128420, 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 Paul Marcus prescribe under Medicare Part D?
In 2024, Paul Marcus had 155 Medicare Part D claims for 53 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.