Quick answers
- Which hospitals does William Casas work at?
- Medicare's official clinician data lists William Casas at 1 hospital: Pomona Valley Hospital Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William Casas see patients?
- Medicare's clinician data lists 2 practice locations, including La Verne, CA and Chino Hills, CA. Call before your visit to confirm the address.
- What is William Casas's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does William Casas accept Medicare assignment?
- Medicare's clinician data says William Casas may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does William Casas offer telehealth?
- Medicare's clinician data says William Casas offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William Casas?
- (909) 392-6501, as listed in official Medicare / NPI Registry data.
- What is William Casas's NPI number?
- 1477998615. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where William Casas works
Medicare's Facility Affiliation Data lists William Casas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Pomona Valley Hospital Medical CenterPomona, CA · Acute Care Hospital · CCN 050231
Practice locations
Addresses where William Casas is enrolled with Medicare (CMS data updated 2026-10-02).
- 2333 Foothill BlvdLa Verne, CA 91750 (909) 392‑6501
- 3110 Chino Ave, Suite 150bChino Hills, CA 91709 (909) 630‑7868
Group practices
Medicare enrollment lists William Casas as a member of this group (CMS data updated 2026-10-02).
- Premier Family Medicine Associates, Inc65 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in La Verne
Clinicians with the same Medicare primary specialty in La Verne, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1996 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1477998615 |
| 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