Mark Chou, D.O.
NPI 1578854543ActiveIndividual· Internal Medicine, Cardiovascular Disease· Loma Linda, CA
Internal Medicine, Cardiovascular Disease (D.O.) with Intermountain Medical Group Grand Junction, LLC, practicing in Loma Linda, California. Their prescriptions cost Medicare Part D more than their services did: $390,104 for 1,938 claims, against $101,428 paid for services in 2024. Medtronic, Inc. reported $49.60 in payments in 2025, mostly food and beverage. Lists Good Samaritan Medical Center LLC and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1578854543 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | Apr 26, 2011 |
| Last updated in NPPES | Aug 4, 2020 |
| Certified by provider | Aug 4, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | DR.0064783 | CO |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (CO); Practitioner - Cardiovascular Disease (Cardiology) (ME) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 736 |
|---|---|
| Services billed | 1,587 across 91 procedure codes |
| Paid by Medicare | $101,428 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,938 · 5,019 30-day fills |
|---|---|
| Patients | 336 |
| Total drug cost | $390,104 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
Medical group
- Intermountain Medical Group Grand Junction, LLCGrand Junction, CO · 296 clinicians
Hospital affiliations
- Good Samaritan Medical Center LLCLafayette, CO
- Intermountain Health Platte Valley HospitalBrighton, CO
- Intermountain Health St. Mary's Regional HospitalGrand Junction, CO
- Northern Light Maine Coast HospitalEllsworth, ME
- Saint Joseph HospitalDenver, CO
Industry payments (Open Payments)
- 2025$49.60 · 1 payment from 1 company
- 2024$797.74 · 26 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Medtronic, Inc. | $49.60 | 1 |
What the 2025 payments were for
- Food and Beverage$49.60 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Cardiovascular Disease providers in Loma Linda
- 1265686109
- 1316997596
- 1982899704
- 1801900998
- 1093807356
- 1265454672
- 1306296074
- 1417047937
- 1649374299
- 1639551302
- 1619397296
- 1427240639
All Internal Medicine, Cardiovascular Disease providers in California →