Quick answers
- Which hospitals does Andrew M. Gregg work at?
- Medicare's official clinician data lists Andrew M. Gregg at 3 hospitals: Los Robles Hospital & Medical Center, Ronald Reagan UCLA Medical Center and UCLA West Valley Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Andrew M. Gregg see patients?
- Medicare's clinician data lists 5 practice locations, including Thousand Oaks, CA, Santa Monica, CA and West Hills, CA. Call before your visit to confirm the address.
- What is Andrew M. Gregg's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Andrew M. Gregg accept Medicare assignment?
- Yes. Medicare's clinician data says Andrew M. Gregg 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 Andrew M. Gregg offer telehealth?
- Medicare's clinician data says Andrew M. Gregg offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Andrew M. Gregg?
- (805) 418-3500, as listed in official Medicare / NPI Registry data.
- What is Andrew M. Gregg's NPI number?
- 1942769104. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Andrew M. Gregg works
Medicare's Facility Affiliation Data lists Andrew M. Gregg at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Los Robles Hospital & Medical CenterThousand Oaks, CA · Acute Care Hospital · CCN 050549
- Ronald Reagan UCLA Medical CenterLos Angeles, CA · Acute Care Hospital · CCN 050262
- UCLA West Valley Medical CenterWest Hills, CA · Acute Care Hospital · CCN 050481
Practice locations
Addresses where Andrew M. Gregg is enrolled with Medicare (CMS data updated 2026-10-02).
- 100 Moody Ct, Suite 200Thousand Oaks, CA 91360 (805) 418‑3500
- 2020 Santa Monica Blvd, Suite 210Santa Monica, CA 90404 (310) 458‑2381
- 215 W Janss RdThousand Oaks, CA 91360 (805) 497‑2727
- 248 Hampshire Rd, Suite 100Thousand Oaks, CA 91361 (805) 370‑0040
- 7300 Medical Ctr DrWest Hills, CA 91307 (818) 676‑4000
Group practices
Medicare enrollment lists Andrew M. Gregg as a member of this group (CMS data updated 2026-10-02).
- The Regents of the University of California1,462 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Thousand Oaks
Clinicians with the same Medicare primary specialty in Thousand Oaks, CA — not a recommendation.
Clinician information
| Graduation year | 2019 |
|---|---|
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942769104 |
| 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