Walter O'Brien, M.D.
NPI 1346290814 · Sports Medicine (Family Medicine) Physician · Los Angeles, CA
Enrolled with Medicare as Practitioner - Orthopedic Surgery · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Walter O'Brien, M.D. is a Sports Medicine (Family Medicine) Physician provider in Los Angeles, CA (NPI 1346290814).
Provider details
- NPI number
- 1346290814
- Entity type
- Individual
- Primary specialty
- Sports Medicine (Family Medicine) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G063193 (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
20 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-12
- Last updated
- 2023-03-07
- Certified
- 2020-05-22
Frequently asked questions
- What is Walter O'Brien's NPI number?
- Walter O'Brien's National Provider Identifier (NPI) is 1346290814, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Walter O'Brien's specialty?
- Walter O'Brien is listed in the NPPES registry with a primary specialty of Sports Medicine (Family Medicine) Physician (Allopathic & Osteopathic Physicians).
- Where is Walter O'Brien located?
- Walter O'Brien's practice location on file with NPPES is 11600 Wilshire Blvd, Los Angeles, CA 90025-5781.
- What is Walter O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Walter O'Brien is (310) 477-7276.
- Does Walter O'Brien accept Medicare?
- Walter 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 Walter O'Brien's NPI active?
- Yes — Walter O'Brien's NPI (1346290814) is active in the NPPES registry as of the last update on 2023-03-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.