Carol Madellaine Marquez, MD
Radiation Oncology Physician · Stanford, CA
Carol Madellaine Marquez, MD is a radiation oncology physician with a practice address in Stanford, California, and NPI 1568478014, issued on Aug 1, 2006. Check the license (California G64905, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Carol Madellaine Marquez
- Credential
- MD
- Primary taxonomy
- Radiation Oncology Physician 2085R0001X
- License numbers
- G64905 CA
MD18221 OR
MD00034102 WA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Pasteur Dr, Stanford, CA 94305
- Phone
- (650) 723-4000
- Enumerated
- Aug 1, 2006
- Record last updated
- Jul 6, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicaid ID
- 286710 OR
- Medicare enrollment
- Enrolled (PECOS I20150724012293); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1987
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest radiation oncology physician records → All 735 in California → Look up another NPI →
Also registered at 300 Pasteur Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Carol Madellaine Marquez in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G64905Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
16% fewer Medicare Part D claims than the average radiation oncology physician in 2024
113 Medicare Part D claims for 77 beneficiaries, against an average of 134 among the 4,851 providers of this specialty who prescribed in Part D.
Most prescribed
- Mometasone Furoate87 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.
One hospital affiliation
- Stanford Health CareStanford, CA · Acute Care Hospitals5 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Carol Madellaine Marquez among 735 radiation oncology physician records in California
Carol Madellaine Marquez, MD is one of 735 radiation oncology physician records with a practice address in California. 83% 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 16% of them.
- NPI issued2006 · 16% of these records are older, 55% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1987 · median 2005 among the 545 with a school on file
- Record last updated2015 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
43 radiation oncology physician records list a practice address in Stanford
They are 43 of the 5,606 NPPES records with a practice address in Stanford, and 735 radiation oncology physician records in California.
All 735 in California → Every provider in Stanford → Radiation Oncology Physician nationwide →
The 8 radiation oncology physician records with the nearest ZIP codes
- Mark Buyyounouski, M.D.Stanford, CA 943051912927021
- Sarah Donaldson, M.D.Stanford, CA 943051033276316
- Steven Hancock, M.D.Stanford, CA 943051821136631
- Wendy Hara, M.D.Stanford, CA 943051437343076
- Richard Hoppe, M.D.Stanford, CA 943051730221821
- Kathleen Horst, M.D.Stanford, CA 943051144385386
- Daniel Kapp, MDStanford, CA 943051063550747
- Elizabeth Kidd, M.D.Stanford, CA 943051760508899
Common questions
What is Carol Madellaine Marquez, MD's NPI number?
Carol Madellaine Marquez, MD's National Provider Identifier (NPI) is 1568478014, issued on Aug 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Carol Madellaine Marquez, MD located?
The NPPES record lists a practice address at 300 Pasteur Dr, Stanford, CA, 94305. Phone: (650) 723-4000. Providers update this record themselves, so call before visiting.
How can I verify Carol Madellaine Marquez, MD's license?
NPPES lists California license number G64905, 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 Carol Madellaine Marquez, MD prescribe under Medicare Part D?
In 2024, Carol Madellaine Marquez, MD had 113 Medicare Part D claims for 77 beneficiaries; the average among radiation oncology physician prescribers was 134. 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.