Quick answers
- Which hospitals does Gregory J. Katz work at?
- Medicare's official clinician data lists Gregory J. Katz at 1 hospital: Hoag Memorial Hospital Presbyterian. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory J. Katz see patients?
- Medicare's clinician data lists 1 practice location in Newport Beach, CA. Call before your visit to confirm the address.
- What is Gregory J. Katz's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Gregory J. Katz accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory J. Katz 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 Gregory J. Katz offer telehealth?
- Medicare's clinician data says Gregory J. Katz offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Gregory J. Katz?
- (949) 642-2333, as listed in official Medicare / NPI Registry data.
- What is Gregory J. Katz's NPI number?
- 1184674178. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory J. Katz works
Medicare's Facility Affiliation Data lists Gregory J. Katz 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
Practice locations
Addresses where Gregory J. Katz is enrolled with Medicare (CMS data updated 2026-10-02).
- 520 Superior Ave, Suite 220Newport Beach, CA 92663 (949) 642‑2333
Group practices
Medicare enrollment lists Gregory J. Katz as a member of this group (CMS data updated 2026-10-02).
- Newport Medicine Group Inc2 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Newport Beach
Clinicians with the same Medicare primary specialty in Newport Beach, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Albert Einstein College Of Medicine Of Yeshiva University |
| Graduation year | 1991 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1184674178 |
| 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