Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Benjamin Leach, MD

Individual provider Hematology & Oncology Physician · NPI 1497026140

Benjamin Leach, MD practises Medical Oncology in Mission Hills, California. Graduated from Tulane University School of Medicine in 2011, 15 years ago. Practices with City of Hope Medical Foundation, a 959-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
15
Trained at
Tulane University School of Medicine
Licensed in
CA
In the registry since
2012
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

15031 Rinaldi St Ste 150
Mission Hills, CA 91345-1207
Phone: (818) 660-4700
Fax: (818) 837-1987
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1100 San Bernardino Road, Upland, CA 91786-4952 — (909) 949-2242

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence A122493 (CA)

Record details

NPI number1497026140
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJanuary 25, 2012
Last updated in NPPESNovember 11, 2020
Certification dateNovember 11, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyMEDICAL ONCOLOGY
Also practisesHEMATOLOGY/ONCOLOGY
Medical schoolTULANE UNIVERSITY SCHOOL OF MEDICINE
Graduated 2011 (15 years in practice)
Group practice City Of Hope Medical Foundation — 959 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations4 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients494
Average patient age75

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $203 3 payments · a meal or drink at a meeting or visit, not a fee
Education $31 1 payment · educational material or training, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Adventist Health Simi Valley Hospital · Simi Valley, CA · listed as Simi Valley Hospital & Health Care Services
  • Henry Mayo Newhall Hospital Hospital · Valencia, CA · listed as Henry Mayo Newhall Memorial Hospital
  • Northridge Hospital Medical Center Hospital · Northridge, CA
  • Providence Holy Cross Medical Center Hospital · Mission Hills, CA

Also affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at City of Hope Medical Foundation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 959 clinicians in the practice; 12 are shown here.

Other providers in Mission Hills