Quick answers
- Which hospitals does John Sun work at?
- Medicare's official clinician data lists John Sun at 3 hospitals: Hoag Memorial Hospital Presbyterian, Memorialcare Saddleback Medical Center and Providence Mission Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Sun see patients?
- Medicare's clinician data lists 1 practice location in Laguna Hills, CA. Call before your visit to confirm the address.
- What is John Sun's specialty?
- Medicare lists Otolaryngology as the primary specialty.
- Does John Sun accept Medicare assignment?
- Yes. Medicare's clinician data says John Sun 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 John Sun?
- (949) 305-8000, as listed in official Medicare / NPI Registry data.
- What is John Sun's NPI number?
- 1578664025. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John Sun works
Medicare's Facility Affiliation Data lists John Sun 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
Practice locations
Addresses where John Sun is enrolled with Medicare (CMS data updated 2026-10-02).
- 24411 Health Ctr Dr, Suite 600Laguna Hills, CA 92653 (949) 305‑8000
Group practices
Medicare enrollment lists John Sun as a member of this group (CMS data updated 2026-10-02).
- Orange County Ear Nose and Throat3 clinicians in the group
Specialties
- Otolaryngologyprimary
Other ENT doctors in Laguna Hills
Clinicians with the same Medicare primary specialty in Laguna Hills, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Washington University School Of Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1578664025 |
| 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