Gregory H. Tchejeyan, M.D., INC
NPI 1689668188ActiveIndividual· Specialist· Thousand Oaks, CA
Specialist (M.D., INC) in Thousand Oaks, California, trained at University of Southern California Keck School of Medicine (class of 1994). 657 Medicare patients in 2024, $465,112 paid; nearly all of their 519 Part D prescriptions were generic (99%). Stryker Corporation was the largest of 2 companies reporting payments in 2025, $126.07 in all, mostly food and beverage.
Overview
| NPI | 1689668188 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., INC |
| Sole proprietor | Yes |
| NPI issued | Sep 12, 2005 |
| Last updated in NPPES | Mar 29, 2022 |
| Certified by provider | Mar 29, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | A55364 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Orthopedic Surgery (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 657 |
|---|---|
| Services billed | 21,529 across 104 procedure codes |
| Paid by Medicare | $465,112 |
Part D prescriptions in 2024
| Prescriptions (claims) | 519 · 531 30-day fills |
|---|---|
| Patients | 187 |
| Total drug cost | $4,776 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Orthopedic Surgery |
Hospital affiliation
- Los Robles Hospital & Medical CenterThousand Oaks, CA
Other facilities
- Assisted Home CareHome health agency · Ventura, CA
- Assisted Home CareHome health agency · Mission Hills, CA
- Los Robles HealthcareHome health agency · Thousand Oaks, CA
Industry payments (Open Payments)
- 2025$126.07 · 2 payments from 2 companies
- 2024$137.41 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Stryker Corporation | $64.11 | 1 |
| Saxum Surgical, Inc. | $61.96 | 1 |
What the 2025 payments were for
- Food and Beverage$126.07 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 54 Specialist providers in Thousand Oaks · All Specialist providers in California