Quick answers
- Which hospitals does Gregory Tchejeyan work at?
- Medicare's official clinician data lists Gregory Tchejeyan at 1 hospital: Los Robles Hospital & Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory Tchejeyan see patients?
- Medicare's clinician data lists 2 practice locations, including Thousand Oaks, CA. Call before your visit to confirm the address.
- What is Gregory Tchejeyan's specialty?
- Medicare lists Orthopedic Surgery as the primary specialty.
- Does Gregory Tchejeyan accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory Tchejeyan 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 Gregory Tchejeyan?
- (805) 495-3687, as listed in official Medicare / NPI Registry data.
- What is Gregory Tchejeyan's NPI number?
- 1689668188. 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 Tchejeyan works
Medicare's Facility Affiliation Data lists Gregory Tchejeyan 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
Practice locations
Addresses where Gregory Tchejeyan is enrolled with Medicare (CMS data updated 2026-10-02).
- 2100 Lynn RdThousand Oaks, CA 91360
- 250 Lombard St, Suite 1Thousand Oaks, CA 91360 (805) 495‑3687
Specialties
- Orthopedic Surgeryprimary
Other orthopedic surgeons in Thousand Oaks
Clinicians with the same Medicare primary specialty in Thousand Oaks, CA — not a recommendation.
Clinician information
| Medical school | University Of Southern California Keck School Of Medicine |
|---|---|
| Graduation year | 1994 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1689668188 |
| 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