Katrina Fischer
Hematology & Oncology Physician · San Mateo, CA
Katrina Fischer is a hematology & oncology physician with a practice address in San Mateo, California, and NPI 1477972388, issued on Apr 8, 2014. Check the license (California A139123, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Katrina Fischer
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- A139123 CA
Self-reported in NPPES; status is on the state search - Practice location
- 100 S San Mateo Dr, San Mateo, CA 94401
- Phone
- (650) 696-4509
- Enumerated
- Apr 8, 2014
- Record last updated
- Aug 17, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200817000189); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest hematology & oncology physician records → All 1,583 in California → Look up another NPI →
Also registered at 100 S San Mateo Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Harriet Borofsky, M.D.Diagnostic Radiology Physician1033162912
- Kelly Broderick, M.D.Diagnostic Radiology Physician1609821891
- Joey CheungRadiological Physics Physician1154256493
Verify Katrina Fischer in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A139123Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
378 Medicare Part D claims for 111 beneficiaries, against an average of 877 among the 10,784 providers of this specialty who prescribed in Part D. Brand-name drugs were 26% of claims. 14 claims were for opioids.
Most prescribed
- Letrozole50 claims
- Hydroxyurea27 claims
- Dexamethasone21 claims
- Xarelto19 claims
- Prochlorperazine Maleate18 claims
- Eliquis12 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): 96.5 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).
Industry payments in 2024: $1,065.51
14 payments; by number, the most common kind was long term medical supply or device loan; the largest payer was Novartis Pharmaceuticals Corporation. The 8,560 providers of this specialty with any payment received $7,481.41 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Monterey Bay Oncology A Medical CorporationMonterey, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katrina Fischer among 1,583 hematology & oncology physician records in California
Katrina Fischer is one of 1,583 hematology & 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 2014, is newer than 81% of them.
- NPI issued2014 · 81% of these records are older, 16% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2014 · median 2003 among the 1,124 with a school on file
- Record last updated2020 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RH0003X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hematology & Oncology Physician providers in California
There are 1,583 hematology & oncology physician records in California.
All 1,583 in California → Every provider in San Mateo → Hematology & Oncology Physician nationwide →
The 8 hematology & oncology physician records with the nearest ZIP codes
- Brian Henderson, M.D.San Mateo, CA 944011497846901
- Eric Kuo, MDSan Mateo, CA 944011962907014
- Julian McLain, MDSan Mateo, CA 944011063916591
- Kent Adler, M.D.San Mateo, CA 944021013074632
- Jennifer Brown, M.D.San Mateo, CA 944021740347350
- Karen Chee, M.D.San Mateo, CA 944021487637310
- Robert Cohen, MDSan Mateo, CA 944021073034765
- Bradley Ekstrand, M.D., PH.D.San Mateo, CA 944021528125135
Common questions
What is Katrina Fischer's NPI number?
Katrina Fischer's National Provider Identifier (NPI) is 1477972388, issued on Apr 8, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Katrina Fischer located?
The NPPES record lists a practice address at 100 S San Mateo Dr, San Mateo, CA, 94401. Phone: (650) 696-4509. Providers update this record themselves, so call before visiting.
How can I verify Katrina Fischer's license?
NPPES lists California license number A139123, 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 Katrina Fischer prescribe under Medicare Part D?
In 2024, Katrina Fischer had 378 Medicare Part D claims for 111 beneficiaries; the average among hematology & oncology physician prescribers was 877. Part D covers Medicare prescriptions only.
What is Katrina Fischer's MIPS final score?
The 2023 MIPS final score is 96.5 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.