Mark M. Moasser, M.D.
Medical Oncology Physician · San Francisco, CA
Mark M. Moasser, M.D. is a medical oncology physician with a practice address in San Francisco, California, and NPI 1417911751, issued on Apr 13, 2006. Check the license (California A85674, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Mark M. Moasser
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- A85674 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1600 Divisadero St, San Francisco, CA 94115
- Phone
- (415) 353-7070
- Enumerated
- Apr 13, 2006
- Record last updated
- Jul 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (415) 353-7021
- Medicaid ID
- 00A865740 CA
- Medicare enrollment
- Enrolled (PECOS I20040618000450); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 1988
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 447 in California → Look up another NPI →
Also registered at 1600 Divisadero St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Betsy Althaus, PHARM.D.Pharmacist1366650657
- Mehrdad Arjomandi, MDCritical Care Medicine (Internal Medicine) Physician1912951153
- Chloe Atreya, MD, PHDMedical Oncology Physician1326058777
- Ronald Balassanian, MDAnatomic Pathology & Clinical Pathology Physician1043282379
- Christopher Benz, M.D.Medical Oncology Physician1457381014
- Emily Bergsland, MDMedical Oncology Physician1295792729
Verify Mark M. Moasser in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A85674Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
48% fewer Medicare Part D claims than the average medical oncology physician in 2024
363 Medicare Part D claims for 66 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 16% of claims. 18 claims were for opioids.
Most prescribed
- Letrozole111 claims
- Anastrozole65 claims
- Tamoxifen Citrate29 claims
- Verzenio24 claims
- Ibrance17 claims
- Exemestane13 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): 74.5 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 2 group practices
- Ucsf Medical Group Business ServicesSan Francisco, CA
- University OF California San FranciscoSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark M. Moasser among 447 medical oncology physician records in California
Mark M. Moasser, M.D. is one of 447 medical oncology physician records with a practice address in California. 82% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 55% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1988 · median 2004 among the 312 with a school on file
- Record last updated2008 · 41% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in California
There are 447 medical oncology physician records in California.
All 447 in California → Every provider in San Francisco → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Chloe Atreya, MD, PHDSan Francisco, CA 941151326058777
- Christopher Benz, M.D.San Francisco, CA 941151457381014
- Emily Bergsland, MDSan Francisco, CA 941151295792729
- John Berry, M.D.San Francisco, CA 941151942236997
- Charles Dollbaum, M.D.San Francisco, CA 941151205863552
- Thierry Jahan, MDSan Francisco, CA 941151427007657
- Kevin Kim, M.D.San Francisco, CA 941151851485056
- Alan Kramer, MDSan Francisco, CA 941151356357347
Common questions
What is Mark M. Moasser, M.D.'s NPI number?
Mark M. Moasser, M.D.'s National Provider Identifier (NPI) is 1417911751, issued on Apr 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mark M. Moasser, M.D. located?
The NPPES record lists a practice address at 1600 Divisadero St, San Francisco, CA, 94115. Phone: (415) 353-7070. Providers update this record themselves, so call before visiting.
How can I verify Mark M. Moasser, M.D.'s license?
NPPES lists California license number A85674, 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 Mark M. Moasser, M.D. prescribe under Medicare Part D?
In 2024, Mark M. Moasser, M.D. had 363 Medicare Part D claims for 66 beneficiaries; the average among medical oncology physician prescribers was 703. Part D covers Medicare prescriptions only.
What is Mark M. Moasser, M.D.'s MIPS final score?
The 2023 MIPS final score is 74.5 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.