Quick answers
- Which hospitals does Benjamin Leach work at?
- Medicare's official clinician data lists Benjamin Leach at 4 hospitals: Adventist Health Simi Valley, Henry Mayo Newhall Hospital, Northridge Hospital Medical Center and Providence Holy Cross Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Benjamin Leach see patients?
- Medicare's clinician data lists 4 practice locations, including Simi Valley, CA, Mission Hills, CA and South Pasadena, CA. Call before your visit to confirm the address.
- What is Benjamin Leach's specialty?
- Medicare lists Medical Oncology as the primary specialty, and also Hematology/Oncology.
- Does Benjamin Leach accept Medicare assignment?
- Yes. Medicare's clinician data says Benjamin Leach accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does Benjamin Leach offer telehealth?
- Medicare's clinician data says Benjamin Leach offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Benjamin Leach?
- (805) 527-2770, as listed in official Medicare / NPI Registry data.
- What is Benjamin Leach's NPI number?
- 1497026140. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Benjamin Leach works
Medicare's Facility Affiliation Data lists Benjamin Leach at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health Simi ValleySimi Valley, CA · Acute Care Hospital · CCN 050236
- Henry Mayo Newhall HospitalValencia, CA · Acute Care Hospital · CCN 050624
- Northridge Hospital Medical CenterNorthridge, CA · Acute Care Hospital · CCN 050116
- Providence Holy Cross Medical CenterMission Hills, CA · Acute Care Hospital · CCN 050278
Practice locations
Addresses where Benjamin Leach is enrolled with Medicare (CMS data updated 2026-10-02).
- 1157 Swallow LnSimi Valley, CA 93065 (805) 527‑2770
- 15031 Rinaldi St, Suite 100and150Mission Hills, CA 91345 (818) 496‑4410
- 209 Fair Oaks AveSouth Pasadena, CA 91030 (626) 396‑2900
- 425 Haaland Dr, Suite 101Thousand Oaks, CA 91361 (805) 496‑2949
Group practices
Medicare enrollment lists Benjamin Leach as a member of this group (CMS data updated 2026-10-02).
- City of Hope Medical Foundation982 clinicians in the group
Specialties
- Medical Oncologyprimary
- Hematology/Oncologyalso
Other oncologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tulane University School Of Medicine |
| Graduation year | 2011 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1497026140 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians