Mary Ellen O'Sullivan, ED.D.
Clinical Psychologist · North Chelmsford, MA
Mary Ellen O'Sullivan, ED.D. is a clinical psychologist with a practice address in North Chelmsford, Massachusetts, and NPI 1952469884, issued on Dec 4, 2006. Check the license (Massachusetts 3256, as entered in NPPES) with the Massachusetts board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Mary Ellen O'Sullivan
- Credential
- ED.D.
- Primary taxonomy
- Clinical Psychologist 103TC0700X
- License number
- 3256 MA
Self-reported in NPPES; status is on the state search - Practice location
- 10 Adams St, North Chelmsford, MA 01863
- Phone
- (978) 251-7337
- Enumerated
- Dec 4, 2006
- Record last updated
- Oct 22, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (978) 251-8453
- Medicare enrollment
- Enrolled (PECOS I20121120000181); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest clinical psychologist records → All 3,185 in Massachusetts → Look up another NPI →
Also registered at 10 Adams St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Peter Alfano, PA-CMedical Physician Assistant1619472586
- Nicole BenjaminPrimary Care Nurse Practitioner1790599769
- Chau Le, AGPCNP-BCPrimary Care Nurse Practitioner1871969535
- Meeta Nguyen, M.D.Preventive Medicine/Occupational Environmental Medicine Physician1366637605
- Daniel Rosa, PH.D.Clinical Psychologist1477621738
- Marguerite Ryan, LMFT, CADAC IIMental Health Counselor1700938164
Verify Mary Ellen O'Sullivan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 3256Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Mary Ellen O'Sullivan among 3,185 clinical psychologist records in Massachusetts
Mary Ellen O'Sullivan, ED.D. is one of 3,185 clinical psychologist records with a practice address in Massachusetts. 12% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 2% of them.
- NPI issued2006 · 2% of these records are older, 70% newer
- In a Medicare fileNo · 12% of these records are
- In the CMS Doctors and Clinicians fileYes · 24% of these records are
- Graduated1982 · median 2000 among the 777 with a school on file
- Record last updated2011 · 71% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 103TC0700X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
4 clinical psychologist records list a practice address in North Chelmsford
They are 4 of the 159 NPPES records with a practice address in North Chelmsford, and 3,185 clinical psychologist records in Massachusetts. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3,185 in Massachusetts → Every provider in North Chelmsford → Clinical Psychologist nationwide →
The 8 clinical psychologist records with the nearest ZIP codes
- Rosemary Duffy, PSY.D.North Chelmsford, MA 018631033276167
- Vanessa Leary, PSYDNorth Chelmsford, MA 018631114252236
- Daniel Rosa, PH.D.North Chelmsford, MA 018631477621738
- Paul Domigan, PHDNorth Billerica, MA 018621851935860
- Colleen Long, PSY.D.North Reading, MA 018641558662445
- Gregory Morin, PH.D.North Reading, MA 018641588727325
- Allison Jekogian, PSY.D.Reading, MA 018671891163879
- Jennifer Macdonald, PH.D.Reading, MA 018671013103407
Common questions
What is Mary Ellen O'Sullivan, ED.D.'s NPI number?
Mary Ellen O'Sullivan, ED.D.'s National Provider Identifier (NPI) is 1952469884, issued on Dec 4, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Mary Ellen O'Sullivan, ED.D. located?
The NPPES record lists a practice address at 10 Adams St, North Chelmsford, MA, 01863. Phone: (978) 251-7337. Providers update this record themselves, so call before visiting.
How can I verify Mary Ellen O'Sullivan, ED.D.'s license?
NPPES lists Massachusetts license number 3256, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.