Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Mary Ellen O'Sullivan, EDD

Individual provider Clinical Psychologist · NPI 1952469884

Dr. Mary Ellen O'Sullivan, EDD is a Clinical Psychologist in North Chelmsford, Massachusetts. Qualified in 1982, 44 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in Massachusetts.

Years since qualifying
44
Licensed in
MA
In the registry since
2006
What do these letters mean?
EDD — Doctor of Education
A doctorate in education.

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Practice location Address checks out

10 Adams St Ste 2
North Chelmsford, MA 01863-1746
Phone: (978) 251-7337
Fax: (978) 251-8453
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 3256 (MA)

Record details

NPI number1952469884
Entity typeIndividual (Type 1)
GenderFemale
Credentials EDD
Sole proprietorYes
NPI enumeratedDecember 4, 2006
Last updated in NPPESOctober 22, 2011

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCLINICAL PSYCHOLOGIST
Medical schoolOTHER
Graduated 1982 (44 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in North Chelmsford