Quick answers
- Where does Geoffrey Geiger see patients?
- Medicare's clinician data lists 3 practice locations, including Downey, CA, Lakewood, CA and Covina, CA. Call before your visit to confirm the address.
- What is Geoffrey Geiger's specialty?
- Medicare lists Hematology/Oncology as the primary specialty.
- Does Geoffrey Geiger accept Medicare assignment?
- Yes. Medicare's clinician data says Geoffrey Geiger 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 Geoffrey Geiger?
- (562) 869-1201, as listed in official Medicare / NPI Registry data.
- What is Geoffrey Geiger's NPI number?
- 1285836619. 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 Geoffrey Geiger is enrolled with Medicare (CMS data updated 2026-10-02).
- 11525 Brookshire Ave, Suite 202Downey, CA 90241 (562) 869‑1201
- 3300 E S St, Suite 304Lakewood, CA 90805 (562) 232‑0550
- 554 E San Bernardino Rd, Suite 105Covina, CA 91723 (626) 331‑6866
Group practices
Medicare enrollment lists Geoffrey Geiger as a member of this group (CMS data updated 2026-10-02).
- The Oncology Institute Ca, a Professional Corporation113 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 | Pennsylvania State University College Of Medicine |
| Graduation year | 2007 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1285836619 |
| 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