Quick answers
- Which hospitals does William W. Chang work at?
- Medicare's official clinician data lists William W. Chang at 4 hospitals: Hoag Memorial Hospital Presbyterian, Memorialcare Saddleback Medical Center, Providence Mission Hospital and Providence St. Jude Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does William W. Chang see patients?
- Medicare's clinician data lists 2 practice locations, including Laguna Hills, CA and San Juan Capistrano, CA. Call before your visit to confirm the address.
- What is William W. Chang's specialty?
- Medicare lists Pulmonary Disease as the primary specialty, and also Critical Care (Intensivists) and Internal Medicine.
- Does William W. Chang accept Medicare assignment?
- Yes. Medicare's clinician data says William W. Chang 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 W. Chang offer telehealth?
- Medicare's clinician data says William W. Chang offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for William W. Chang?
- (949) 443-4303, as listed in official Medicare / NPI Registry data.
- What is William W. Chang's NPI number?
- 1417902149. 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 W. Chang works
Medicare's Facility Affiliation Data lists William W. Chang at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · CCN 050224
- Memorialcare Saddleback Medical CenterLaguna Hills, CA · Acute Care Hospital · CCN 050603
- Providence Mission HospitalMission Viejo, CA · Acute Care Hospital · CCN 050567
- Providence St. Jude Medical CenterFullerton, CA · Acute Care Hospital · CCN 050168
Practice locations
Addresses where William W. Chang is enrolled with Medicare (CMS data updated 2026-10-02).
- 23141 Moulton Pkwy, Suite 108Laguna Hills, CA 92653 (949) 443‑4303
- 30230 Rancho Viejo Rd, Suite 200San Juan Capistrano, CA 92675 (949) 443‑4303
Group practices
Medicare enrollment lists William W. Chang as a member of this group (CMS data updated 2026-10-02).
- Paloma Medical Group Inc19 clinicians in the group
Specialties
Other pulmonologists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Michigan State University College Of Osteopathic Medicine |
| Graduation year | 2000 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1417902149 |
| 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