Christopher Mark O'Brien, MD
NPI 1730250788ActiveIndividual· Internal Medicine, Infectious Disease· San Diego, CA
Internal Medicine, Infectious Disease (MD) in San Diego, California, trained at Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $345,804 for 356 claims, against $1,762 paid for services in 2024. Heartflow, Inc. reported $174.44 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1730250788 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 13, 2006 |
| Last updated in NPPES | Nov 29, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | A70951 | 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 - Infectious Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 12 |
|---|---|
| Services billed | 215 across 10 procedure codes |
| Paid by Medicare | $1,762 |
Part D prescriptions in 2024
| Prescriptions (claims) | 356 · 654 30-day fills |
|---|---|
| Patients | 101 |
| Total drug cost | $345,804 |
| Generic share | 72% of claims |
Education and affiliations
| Medical school | Clvlnd Clinic Lerner College of Med of Case Wstn Rsv University |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Infectious Disease |
Medical group
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
Industry payments (Open Payments)
- 2025$174.44 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Heartflow, Inc. | $174.44 | 1 |
What the 2025 payments were for
- Food and Beverage$174.44 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other infectious disease specialists in San Diego
- 1104925205
- 1184647893
- 1235559436
- 1326266081
- 1346408523
- 1720141153
- 1740334978
- 1851503718
- 1861928921
- 1871727859
- 1902954910
- 1922461557
All 89 infectious disease specialists in San Diego · All infectious disease specialists in California