Charles Thomas Chaya, M.D.
NPI 1760438873ActiveIndividual· Internal Medicine, Gastroenterology· Riverside, CA
Internal Medicine, Gastroenterology (M.D.) in Riverside, California, trained at Loma Linda University School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $566,676 for 1,201 claims, against $3,247 paid for services in 2024. Boston Scientific Corporation reported $22.90 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1760438873 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 26, 2006 |
| Last updated in NPPES | Nov 29, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A75305 | CA |
| Internal Medicine, Gastroenterology | 207RG0100X | M1049 | TX |
| Internal Medicine, Gastroenterology | 207RG0100X | 34631 | AZ |
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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 14 |
|---|---|
| Services billed | 22 across 13 procedure codes |
| Paid by Medicare | $3,247 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,201 · 2,420 30-day fills |
|---|---|
| Patients | 596 |
| Total drug cost | $566,676 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | Loma Linda University School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Gastroenterology |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Industry payments (Open Payments)
- 2025$22.90 · 1 payment from 1 company
- 2024$153.45 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Boston Scientific Corporation | $22.90 | 1 |
What the 2025 payments were for
- Food and Beverage$22.90 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Gastroenterology providers in Riverside
- 1083813158
- 1851082267
- 1629396353
- 1679700579
- 1326651688
- 1326140153
- 1396893863
- 1932476975
- 1821160300
- 1073796728
- 1841406568
- 1205817681
All Internal Medicine, Gastroenterology providers in California →