Mark O'Brien, D.O.
NPI 1265532212 · Pediatrics Physician · Fort Wayne, IN
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mark O'Brien, D.O. is a Pediatrics Physician provider in Fort Wayne, IN (NPI 1265532212).
Provider details
- NPI number
- 1265532212
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 02001451A (IN)
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-09-22
- Last updated
- 2025-04-14
- Certified
- 2025-04-14
Frequently asked questions
- What is Mark O'Brien's NPI number?
- Mark O'Brien's National Provider Identifier (NPI) is 1265532212, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mark O'Brien's specialty?
- Mark O'Brien is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Mark O'Brien located?
- Mark O'Brien's practice location on file with NPPES is 6507 E State Blvd, Fort Wayne, IN 46815-7026.
- What is Mark O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Mark O'Brien is (260) 486-3300.
- Does Mark O'Brien accept Medicare?
- Mark 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 Mark O'Brien's NPI active?
- Yes — Mark O'Brien's NPI (1265532212) is active in the NPPES registry as of the last update on 2025-04-14.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.