Quick answers
- Where does Leonard S. Sender see patients?
- Medicare's clinician data lists 1 practice location in El Segundo, CA. Call before your visit to confirm the address.
- What is Leonard S. Sender's specialty?
- Medicare lists Hematology/Oncology as the primary specialty, and also Pediatric Medicine.
- Does Leonard S. Sender accept Medicare assignment?
- Yes. Medicare's clinician data says Leonard S. Sender 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.
- What is Leonard S. Sender's NPI number?
- 1952499741. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Leonard S. Sender is enrolled with Medicare (CMS data updated 2026-10-02).
- 2040 E Mariposa AveEl Segundo, CA 90245
Group practices
Medicare enrollment lists Leonard S. Sender as a member of this group (CMS data updated 2026-10-02).
- Immuno-Oncology Clinic Inc3 clinicians in the group
Specialties
- Hematology/Oncologyprimary
- Pediatric Medicinealso
Other hematologist-oncologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1952499741 |
| 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
- 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