Christopher O'Brien, MD
NPI 1730250788 · Infectious Disease Physician · San Diego, CA
Enrolled with Medicare as Practitioner - Infectious Disease · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Christopher O'Brien, MD is a Infectious Disease Physician provider in San Diego, CA (NPI 1730250788).
Provider details
- NPI number
- 1730250788
- Entity type
- Individual
- Primary specialty
- Infectious Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A70951 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 12 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cephalexin | 33 | 13 |
| Doxycycline Monohydrate | 31 | 15 |
| Isavuconazonium Sulfatebrand: Cresemba | 28 | — |
| Valganciclovir Hcl | 21 | — |
| Mening Vac A,c,y,w-135 Dip/Pfbrand: Menveo A-C-Y-W-135-Dip | 20 | 20 |
| Azithromycin | 15 | — |
| Testosterone | 14 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-13
- Last updated
- 2021-11-29
Frequently asked questions
- What is Christopher O'Brien's NPI number?
- Christopher O'Brien's National Provider Identifier (NPI) is 1730250788, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Christopher O'Brien's specialty?
- Christopher O'Brien is listed in the NPPES registry with a primary specialty of Infectious Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Christopher O'Brien located?
- Christopher O'Brien's practice location on file with NPPES is 4647 Zion Ave, San Diego, CA 92120-2507.
- What is Christopher O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Christopher O'Brien is (619) 528-5000.
- Does Christopher O'Brien accept Medicare?
- Christopher O'Brien is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Christopher O'Brien's NPI active?
- Yes — Christopher O'Brien's NPI (1730250788) is active in the NPPES registry as of the last update on 2021-11-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.