NPPES file of Aug 9, 2026

Margaret O'Brien, LMHC

Mental Health Counselor · Arlington, MA

Margaret O'Brien, LMHC is a mental health counselor with a practice address in Arlington, Massachusetts, and NPI 1891246518, issued on Oct 18, 2016. Check the license (Massachusetts 11198, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1891246518
Name
Margaret O'Brien
Credential
LMHC
Primary taxonomy
Mental Health Counselor 101YM0800X
License numbers
11198 MA
LMHC11198 MA
Self-reported in NPPES; status is on the state search
Practice location
406 Massachusetts Ave, Arlington, MA 02474
Phone
(781) 488-8243
Enumerated
Oct 18, 2016
Record last updated
Jul 19, 2024
Medicare enrollment
Enrolled (PECOS I20240522001817); accepts Medicare assignment
Telehealth
Offers telehealth (CMS)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest mental health counselor records → All 18,415 in Massachusetts → Look up another NPI →

Also registered at 406 Massachusetts Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Michelle Cresta, LMHCMental Health Counselor1750998597
  2. Julie D'Andrea, BSN, RNPsychiatric/Mental Health Registered Nurse1679245708
  3. Lauren Damsky, PMHNPPsychiatric/Mental Health Nurse Practitioner1487928412
  4. Thomas Heneghan, OTR/LOccupational Therapist1528651759
  5. Quinton KakaleyMental Health Counselor1639653421
  6. Robert Kum, D.C.Chiropractor1194788604

Verify Margaret O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
    Search for license 11198    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Massachusetts license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Bills Medicare through one group practice

  1. Thrive Counseling LLCFramingham, MA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Margaret O'Brien among 18,415 mental health counselor records in Massachusetts

Margaret O'Brien, LMHC is one of 18,415 mental health counselor records with a practice address in Massachusetts. 7% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 48% of them.

  • NPI issued2016 · 48% of these records are older, 48% newer
  • In a Medicare fileYes · 7% of these records are
  • In the CMS Doctors and Clinicians fileYes · 10% of these records are
  • Graduated2016 · median 2014 among the 1,811 with a school on file
  • Record last updated2024 · 60% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 101YM0800X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

112 mental health counselor records list a practice address in Arlington

They are 112 of the 974 NPPES records with a practice address in Arlington, and 18,415 mental health counselor records in Massachusetts.

All 18,415 in Massachusetts → Every provider in Arlington → Mental Health Counselor nationwide →

The 8 mental health counselor records with the nearest ZIP codes

  1. Zoi Andalcio, MS, LMHCArlington, MA 024741609046192
  2. Lynette Cassel, MS, ATR, LMHCArlington, MA 024741588719975
  3. Pauline Chan, MAArlington, MA 024741386892917
  4. Carmen Dominguez, LMHCArlington, MA 024741558585570
  5. Judith Glick, LMHCArlington, MA 024741881754943
  6. Stephen Joseph, L.M.H.C.Arlington, MA 024741316962764
  7. Mark Koenig, MAArlington, MA 024741215073101
  8. Isa Mattei, LMHCArlington, MA 024741619016136

Common questions

What is Margaret O'Brien, LMHC's NPI number?

Margaret O'Brien, LMHC's National Provider Identifier (NPI) is 1891246518, issued on Oct 18, 2016. An NPI identifies a provider in billing; it is not a license.

Where is Margaret O'Brien, LMHC located?

The NPPES record lists a practice address at 406 Massachusetts Ave, Arlington, MA, 02474. Phone: (781) 488-8243. Providers update this record themselves, so call before visiting.

How can I verify Margaret O'Brien, LMHC's license?

NPPES lists Massachusetts license number 11198, 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. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.