Quick answers
- Which hospitals does Alvin G. Castillo work at?
- Medicare's official clinician data lists Alvin G. Castillo at 1 hospital: Kaiser Foundation Hospital - Downey. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Alvin G. Castillo see patients?
- Medicare's clinician data lists 4 practice locations, including Downey, CA and Bellflower, CA. Call before your visit to confirm the address.
- What is Alvin G. Castillo's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Alvin G. Castillo accept Medicare assignment?
- Yes. Medicare's clinician data says Alvin G. Castillo 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 Alvin G. Castillo?
- (800) 923-4040, as listed in official Medicare / NPI Registry data.
- What is Alvin G. Castillo's NPI number?
- 1447386115. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Alvin G. Castillo works
Medicare's Facility Affiliation Data lists Alvin G. Castillo 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 Alvin G. Castillo is enrolled with Medicare (CMS data updated 2026-10-02).
- 9333 Imperial HwyDowney, CA 90242 (800) 923‑4040
- 9333 Rosecrans AveBellflower, CA 90706 (562) 461‑3000
- 9353 Imperial HwyDowney, CA 90242 (562) 657‑9000
- 9449 Imperial HwyDowney, CA 90242 (562) 461‑3000
Group practices
Medicare enrollment lists Alvin G. Castillo as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Downey
Clinicians with the same Medicare primary specialty in Downey, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447386115 |
| 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