1. Home
  2. Directory
  3. Massachusetts
  4. Lexington
  5. Counselor
  6. NPI Profile

MARY E O'BRIEN
NPI 1275839433
Counselor - Mental Health in Lexington, MA

Active since February 07, 2011
1040 WALTHAM ST, LEXINGTON, MA 02421(781) 761-5089 Get Directions Write a Review

NPPES record last updated: June 13, 2016. Verified against the NPPES registry weekly; last sync: August 09, 2026.

About Mary E O'brien NPPES

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

MARY E O'BRIEN (NPI 1275839433) is an individual mental health provider in Lexington, Massachusetts and active in the NPI registry since February 2011.

NPPES Registry Identity

NPI1275839433
Entity TypeIndividualFemale
Primary Taxonomy101YM0800X
Provider Legal NameMARY E O'BRIEN
Location Address1040 WALTHAM STLexington, MA 02421-8033
Mailing Address1040 Waltham StLexington, MA 02421-8033
Phone(781) 761-5089
Sole ProprietorNo
Enumeration DateFebruary 7, 2011
Last NPPES UpdateJune 13, 2016
✔ NPI 1275839433 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCounselor · Mental HealthBehavioral Health & Social Service Providers
Taxonomy Code101YM0800X
1040 WALTHAM ST, Lexington, MA 02421
Open in Google Maps ↗

Other Identifiers 7

Other0000023532MA · Bmc
OtherM18633MA · Bcbs
Other042611055MA · Tax Id
Other1004745MA · Nhp
Other99618201MA · Network Health
Other1303287MA · Mbhp
Other1004745MA · Fallon

Other Providers at the Same Location NPPES 20

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

DENISE MOYO MSW
Counselor (Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 761-5165
MR. KYLE COMBS
Counselor (Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (774) 262-2868
MISS FRANCESCA CAROLINA PERSSON
Counselor (Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 761-5057
MONIQUE MITCHELL
Counselor (Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 761-5165
ASHLEY POIRIER
Counselor (Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 761-5077
DIANA AGATHA NANTONGO MA, LMHC
Counselor (Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 761-5077
MRS. CAROLYN ANN CLAIBORNE
Registered Nurse (Psychiatric/Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 862-3600
ASHLEY SMITH RN
Registered Nurse (Psychiatric/Mental Health)
1040 WALTHAM ST
LEXINGTON, MA 02421
Middlesex County (781) 761-5121

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'brien's NPI number?

The NPI number for Mary O'brien is 1275839433. It was assigned to this individual provider in the NPPES registry on February 7, 2011.

Where is Mary O'brien located?

Mary O'brien practices at 1040 Waltham St, Lexington, MA 02421. The listed phone number is (781) 761-5089.

What is Mary O'brien's specialty?

The primary specialty registered for this NPI is Counselor, specializing in Mental Health, with taxonomy code 101YM0800X.

When was this NPI record last updated?

The NPPES record for Mary O'brien was last updated on June 13, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 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.