Quick answers
- Where does Allen Hassen see patients?
- Medicare's clinician data lists 2 practice locations, including El Monte, CA and Van Nuys, CA. Call before your visit to confirm the address.
- What is Allen Hassen's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Allen Hassen accept Medicare assignment?
- Yes. Medicare's clinician data says Allen Hassen 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 Allen Hassen?
- (626) 575-7500, as listed in official Medicare / NPI Registry data.
- What is Allen Hassen's NPI number?
- 1659604023. 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 Allen Hassen is enrolled with Medicare (CMS data updated 2026-10-02).
- 12100 Valley Blvd, Suite 109aEl Monte, CA 91732 (626) 575‑7500
- 14550 Haynes StVan Nuys, CA 91411 (818) 650‑6700
Group practices
Medicare enrollment lists Allen Hassen as a member of this group (CMS data updated 2026-10-02).
- Southern California Medical Center Inc13 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in El Monte
Clinicians with the same Medicare primary specialty in El Monte, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1659604023 |
| 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