Mary O'Brien, CRNP
NPI 1578554887 · Primary Care Nurse Practitioner · Laurel, MD
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary O'Brien, CRNP is a Primary Care Nurse Practitioner provider in Laurel, MD (NPI 1578554887).
Provider details
- NPI number
- 1578554887
- Entity type
- Individual
- Primary specialty
- Primary Care Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- CRNP
- Sex
- Female
- Sole proprietor
- No
- License
- R073974 (MD)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
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
- 2005-11-04
- Last updated
- 2013-07-06
Frequently asked questions
- What is Mary O'Brien's NPI number?
- Mary O'Brien's National Provider Identifier (NPI) is 1578554887, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary O'Brien's specialty?
- Mary O'Brien is listed in the NPPES registry with a primary specialty of Primary Care Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Mary O'Brien located?
- Mary O'Brien's practice location on file with NPPES is 13952 Baltimore Ave, Laurel, MD 20707-5000.
- What is Mary O'Brien's phone number?
- The practice phone number listed in the NPPES registry for Mary O'Brien is (301) 490-1990.
- Does Mary O'Brien accept Medicare?
- Mary 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 Mary O'Brien's NPI active?
- Yes — Mary O'Brien's NPI (1578554887) is active in the NPPES registry as of the last update on 2013-07-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.