Mary O'Sullivan, ED.D.
NPI 1952469884 · Clinical Psychologist · North Chelmsford, MA
Enrolled with Medicare as Practitioner - Clinical Psychologist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mary O'Sullivan, ED.D. is a Clinical Psychologist provider in North Chelmsford, MA (NPI 1952469884).
Provider details
- NPI number
- 1952469884
- Entity type
- Individual
- Primary specialty
- Clinical PsychologistBehavioral Health & Social Service Providers
- Credential
- ED.D.
- Sex
- Female
- Sole proprietor
- Yes
- License
- 3256 (MA)
Specialties & taxonomies
Behavioral Health & Social Service Providers
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
- 2006-12-04
- Last updated
- 2011-10-22
Frequently asked questions
- What is Mary O'Sullivan's NPI number?
- Mary O'Sullivan's National Provider Identifier (NPI) is 1952469884, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mary O'Sullivan's specialty?
- Mary O'Sullivan is listed in the NPPES registry with a primary specialty of Clinical Psychologist (Behavioral Health & Social Service Providers).
- Where is Mary O'Sullivan located?
- Mary O'Sullivan's practice location on file with NPPES is 10 Adams St, North Chelmsford, MA 01863-1746.
- What is Mary O'Sullivan's phone number?
- The practice phone number listed in the NPPES registry for Mary O'Sullivan is (978) 251-7337.
- Does Mary O'Sullivan accept Medicare?
- Mary O'Sullivan 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'Sullivan's NPI active?
- Yes — Mary O'Sullivan's NPI (1952469884) is active in the NPPES registry as of the last update on 2011-10-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.