NPPES file of Aug 9, 2026

Barbara Giannelli-O'Brien, LCSW

Mental Health Counselor · South Setauket, NY

Barbara Giannelli-O'Brien, LCSW is a mental health counselor with a practice address in South Setauket, New York, and NPI 1144239484, issued on Aug 5, 2006. Check the license (New York R040503-1, as entered in NPPES) with the New York board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.

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

NPPES recordNPPES file of Aug 9, 2026
1144239484
Name
Barbara Giannelli-O'Brien
Credential
LCSW
Primary taxonomy
Mental Health Counselor 101YM0800X
License number
R040503-1 NY
Self-reported in NPPES; status is on the state search
Practice location
3771 Nesconset Hwy Ste 208A, South Setauket, NY 11720
Phone
(631) 751-9600
Enumerated
Aug 5, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20040506000054); accepts Medicare assignment
Medical or professional school
State University Of New York At Stony Brook, School Of Medicine, 1989
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 19,989 in New York → Look up another NPI →

Also registered at 3771 Nesconset Hwy Ste 208A

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

  1. Kimberly Frasca, PSY.D.Psychologist1437349792
  2. Heawon Hake, LCSWSpecialist1720183718

Verify Barbara Giannelli-O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich New York board licenses this profession
    Search for license R040503-1    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 New York license search

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Barbara Giannelli-O'Brien among 19,989 mental health counselor records in New York

Barbara Giannelli-O'Brien, LCSW is one of 19,989 mental health counselor records with a practice address in New York. 6% 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 under 1% of them.

  • NPI issued2006 · under 1% of these records are older, 96% newer
  • In a Medicare fileNo · 6% of these records are
  • In the CMS Doctors and Clinicians fileYes · 11% of these records are
  • Graduated1989 · median 2018 among the 2,142 with a school on file
  • Record last updated2007 · 46% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

4 mental health counselor records list a practice address in South Setauket

They are 4 of the 135 NPPES records with a practice address in South Setauket, and 19,989 mental health counselor records in New York. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 19,989 in New York → Every provider in South Setauket → Mental Health Counselor nationwide →

The 8 mental health counselor records with the nearest ZIP codes

  1. Lizette AmparadoCentereach, NY 117201700532751
  2. Lori Dean, MHC-LPCentereach, NY 117201841004389
  3. Joy Gootkin, LCSWSouth Setauket, NY 117201184719833
  4. Diana Manor, MSCentereach, NY 117201659411254
  5. Marguerite Metzendorf, LCSWRCentereach, NY 117201083816821
  6. Shari Pennington, LCSWSouth Setauket, NY 117201013720507
  7. Dayna RussoCentereach, NY 117201508634296
  8. Christine Walzak, LMHCCentereach, NY 117201013766146

Common questions

What is Barbara Giannelli-O'Brien, LCSW's NPI number?

Barbara Giannelli-O'Brien, LCSW's National Provider Identifier (NPI) is 1144239484, issued on Aug 5, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Barbara Giannelli-O'Brien, LCSW located?

The NPPES record lists a practice address at 3771 Nesconset Hwy Ste 208A, South Setauket, NY, 11720. Phone: (631) 751-9600. Providers update this record themselves, so call before visiting.

How can I verify Barbara Giannelli-O'Brien, LCSW's license?

NPPES lists New York license number R040503-1, as entered by the provider. Search the New York 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.

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.