Quick answers
- Where does William K. Halliday see patients?
- Medicare's clinician data lists 1 practice location in Cerritos, CA. Call before your visit to confirm the address.
- What is William K. Halliday's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does William K. Halliday accept Medicare assignment?
- Yes. Medicare's clinician data says William K. Halliday 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 William K. Halliday?
- (562) 622-2800, as listed in official Medicare / NPI Registry data.
- What is William K. Halliday's NPI number?
- 1013021708. 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 William K. Halliday is enrolled with Medicare (CMS data updated 2026-10-02).
- 12900 Park Plaza Dr, Suite 700Cerritos, CA 90703 (562) 622‑2800
Group practices
Medicare enrollment lists William K. Halliday as a member of this group (CMS data updated 2026-10-02).
- Albion Medical Partners of California West P C25 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in California →
Other cardiologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 1968 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1013021708 |
| 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