Quick answers
- Where does Christopher M. O'Brien see patients?
- Medicare's clinician data lists 1 practice location in San Diego, CA. Call before your visit to confirm the address.
- What is Christopher M. O'Brien's specialty?
- Medicare lists Infectious Disease as the primary specialty.
- Does Christopher M. O'Brien accept Medicare assignment?
- Yes. Medicare's clinician data says Christopher M. O'Brien 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 Christopher M. O'Brien?
- (619) 528-5000, as listed in official Medicare / NPI Registry data.
- What is Christopher M. O'Brien's NPI number?
- 1730250788. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Christopher M. O'Brien is enrolled with Medicare (CMS data updated 2026-10-02).
- 4647 Zion AveSan Diego, CA 92120 (619) 528‑5000
Group practices
Medicare enrollment lists Christopher M. O'Brien as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
- Infectious Diseaseprimary
Other infectious disease doctors in San Diego
Clinicians with the same Medicare primary specialty in San Diego, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University |
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1730250788 |
| 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
- 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