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DR. MARY ELLEN O'SULLIVAN ED.D.
NPI 1952469884
Psychologist - Clinical in North Chelmsford, MA

Active since December 04, 2006PECOS EnrolledAccepts Medicare Assignment
10 ADAMS ST, SUITE 2, NORTH CHELMSFORD, MA 01863(978) 251-7337(978) 251-8453 Get Directions Write a Review

NPPES record last updated: October 22, 2011. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Mary Ellen O'sullivan Ed.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. MARY ELLEN O'SULLIVAN ED.D. (NPI 1952469884) is an individual clinical provider in North Chelmsford, Massachusetts, licensed in Massachusetts (3256) and active in the NPI registry since December 2006. She is enrolled in Medicare PECOS and is a graduate of Other (1982).

NPPES Registry Identity

NPI1952469884
Entity TypeIndividualFemale
Primary Taxonomy103TC0700X
Provider Legal NameDR. MARY ELLEN O'SULLIVANCredential: ED.D.
Location Address10 ADAMS ST, SUITE 2North Chelmsford, MA 01863-1746
Mailing Address10 Adams St, Suite 2North Chelmsford, MA 01863-1746 · (978) 251-7337 · Fax (978) 251-8453
Phone(978) 251-7337
Fax(978) 251-8453
Sole ProprietorYes
Medical School CMSOtherGraduated 1982
Enumeration DateDecember 4, 2006
Last NPPES UpdateOctober 22, 2011
✔ NPI 1952469884 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychologist · ClinicalBehavioral Health & Social Service Providers
Taxonomy Code103TC0700X
License✔ Licensed in MA · 3256
Definition
A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.
10 ADAMS ST, North Chelmsford, MA 01863
Open in Google Maps ↗

Other Identifiers 1

Medicare ID-Type UnspecifiedWO3374MA · Psychology Provider

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Mary Ellen O'sullivan Ed.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID4385895473
PECOS Enrollment IDI20121120000181
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01863 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$189.86 typical visit price
range $63.72 – $189.86
Typical copayment $47.46 (range $15.93 – $47.46)
Most-billed visit code 99205
Established Patient
$111.18 typical visit price
range $21.07 – $155.29
Typical copayment $27.79 (range $5.26 – $38.82)
Most-billed visit code 99214
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 14

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

TRICIA M SCOTT M.D.
Family Medicine
10 ADAMS ST
N CHELMSFORD, MA 01863
Middlesex County (978) 251-3159
SUSAN E MUNROE R.N., B.C., F.N.P.
Nurse Practitioner
10 ADAMS ST
N CHELMSFORD, MA 01863
Middlesex County (978) 251-3159
DAN S NGUYEN M.D.
Family Medicine
10 ADAMS ST
N CHELMSFORD, MA 01863
Middlesex County (978) 251-3159
ZACHARY ST AMANT CNP
Nurse Practitioner (Family)
10 ADAMS ST
N CHELMSFORD, MA 01863
Middlesex County (978) 251-3159
JEFFREY M BYRNE M.D.
Family Medicine
10 ADAMS ST
N CHELMSFORD, MA 01863
Middlesex County (978) 251-3159
DR. MEETA SHAH NGUYEN M.D.
Preventive Medicine (Preventive Medicine/Occupational Environmental Medicine)
10 ADAMS ST
NORTH CHELMSFORD, MA 01863
Middlesex County (978) 251-3159
DR. DANIEL WILLIAM ROSA PH.D.
Psychologist (Clinical)
10 ADAMS ST, SUITE 2
NORTH CHELMSFORD, MA 01863
Middlesex County (978) 251-7887
PETER MICHAEL ALFANO PA-C
Physician Assistant (Medical)
10 ADAMS ST
NORTH CHELMSFORD, MA 01863
Middlesex County (978) 251-3159

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary O'sullivan's NPI number?

The NPI number for Mary O'sullivan is 1952469884. It was assigned to this individual provider in the NPPES registry on December 4, 2006.

Where is Mary O'sullivan located?

Mary O'sullivan practices at 10 Adams St Suite 2, North Chelmsford, MA 01863. The listed phone number is (978) 251-7337.

What is Mary O'sullivan's specialty?

The primary specialty registered for this NPI is Psychologist, specializing in Clinical, with taxonomy code 103TC0700X.

Is Mary O'sullivan enrolled in Medicare?

Yes. Mary O'sullivan is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Mary O'sullivan was last updated on October 22, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.