Quick answers
- Which hospitals does William J. Mack Iv work at?
- Medicare's official clinician data lists William J. Mack Iv at 2 hospitals: Keck Hospital of USC and Los Angeles General Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William J. Mack Iv see patients?
- Medicare's clinician data lists 6 practice locations, including Los Angeles, CA. Call before your visit to confirm the address.
- What is William J. Mack Iv's specialty?
- Medicare lists Neurosurgery as the primary specialty, and also Diagnostic Radiology.
- Does William J. Mack Iv accept Medicare assignment?
- Yes. Medicare's clinician data says William J. Mack Iv 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.
- Does William J. Mack Iv offer telehealth?
- Medicare's clinician data says William J. Mack Iv offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William J. Mack Iv?
- (800) 872-2273, as listed in official Medicare / NPI Registry data.
- What is William J. Mack Iv's NPI number?
- 1811163793. 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 J. Mack Iv works
Medicare's Facility Affiliation Data lists William J. Mack Iv at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Keck Hospital of USCLos Angeles, CA · Acute Care Hospital · CCN 050696
- Los Angeles General Medical CenterLos Angeles, CA · Acute Care Hospital · CCN 050373
Practice locations
Addresses where William J. Mack Iv is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 6; the Medicare profile lists all.
- 1500 San Pablo StLos Angeles, CA 90033
- 1516 San Pablo StLos Angeles, CA 90033 (800) 872‑2273
- 1516 San Pablo St, Suite L3100Los Angeles, CA 90033 (800) 872‑2273
- 1520 San Pablo StLos Angeles, CA 90033 (800) 872‑2273
- 1520 San Pablo St, Fl 4Los Angeles, CA 90033 (800) 872‑2273
Group practices
Medicare enrollment lists William J. Mack Iv as a member of this group (CMS data updated 2026-10-02).
- USC Care Medical Group Inc1,380 clinicians in the group
Specialties
- Neurosurgeryprimary
- Diagnostic Radiologyalso
Other neurosurgeons in Los Angeles
Clinicians with the same Medicare primary specialty in Los Angeles, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Columbia University College Of Physicians And Surgeons |
| Graduation year | 2001 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1811163793 |
| 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