Quick answers
- Which hospitals does Reena Mahajan work at?
- Medicare's official clinician data lists Reena Mahajan at 1 hospital: Kaiser Foundation Hospital - Downey. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Reena Mahajan see patients?
- Medicare's clinician data lists 1 practice location in Harbor City, CA. Call before your visit to confirm the address.
- What is Reena Mahajan's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does Reena Mahajan accept Medicare assignment?
- Yes. Medicare's clinician data says Reena Mahajan 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 the phone number for Reena Mahajan?
- (310) 325-5111, as listed in official Medicare / NPI Registry data.
- What is Reena Mahajan's NPI number?
- 1457519910. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Reena Mahajan works
Medicare's Facility Affiliation Data lists Reena Mahajan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kaiser Foundation Hospital - DowneyDowney, CA · Acute Care Hospital · CCN 050139
Practice locations
Addresses where Reena Mahajan is enrolled with Medicare (CMS data updated 2026-10-02).
- 25825 Vermont AveHarbor City, CA 90710 (310) 325‑5111
Group practices
Medicare enrollment lists Reena Mahajan as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Hematology/Oncologyprimary
Other hematologist-oncologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | George Washington University School Of Medicine |
| Graduation year | 2008 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1457519910 |
| 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