Marcus O'Brien, M.D.
NPI 1215944772 · Pediatrics Physician · Little Rock, AR
Enrolled with Medicare as Practitioner - Pediatric Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcus O'Brien, M.D. is a Pediatrics Physician provider in Little Rock, AR (NPI 1215944772).
Provider details
- NPI number
- 1215944772
- Entity type
- Individual
- Primary specialty
- Pediatrics PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- C-6643 (AR)
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
- 2006-08-01
- Last updated
- 2018-05-30
Frequently asked questions
- What is Marcus O'Brien's NPI number?
- Marcus O'Brien's National Provider Identifier (NPI) is 1215944772, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcus O'Brien's specialty?
- Marcus O'Brien is listed in the NPPES registry with a primary specialty of Pediatrics Physician (Allopathic & Osteopathic Physicians).
- Where is Marcus O'Brien located?
- Marcus O'Brien's practice location on file with NPPES is 1 Childrens Way #653, Little Rock, AR 72202.
- What is Marcus O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Marcus O'Brien is (501) 364-1100.
- Does Marcus O'Brien accept Medicare?
- Marcus 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 Marcus O'Brien's NPI active?
- Yes — Marcus O'Brien's NPI (1215944772) is active in the NPPES registry as of the last update on 2018-05-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.