NPPES file of Aug 9, 2026

Thomas Joseph O'Brien, PSY D

Clinical Psychologist · Hartford, CT

Thomas Joseph O'Brien, PSY D is a clinical psychologist with a practice address in Hartford, Connecticut, and NPI 1316922644, issued on Dec 9, 2005. Check the license (Connecticut 002550, as entered in NPPES) with the Connecticut 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
1316922644
Name
Thomas Joseph O'Brien
Credential
PSY D
Primary taxonomy
Clinical Psychologist 103TC0700X
License number
002550 CT
Self-reported in NPPES; status is on the state search
Practice location
500 Vine St, Hartford, CT 06112
Phone
(860) 297-0852
Enumerated
Dec 9, 2005
Record last updated
Jan 15, 2008 (not updated in 18 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20040420000485); accepts Medicare assignment
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 clinical psychologist records → All 1,114 in Connecticut → Look up another NPI →

Also registered at 500 Vine St

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

  1. Margaret Chaplin, M.D.Psychiatry Physician1295874899
  2. Selina Christian, LCSWClinical Social Worker1275698425
  3. Brian Conover, PSY.D.Psychologist1003085150
  4. Allison Dalrymple-Mason, LCSWClinical Social Worker1598831034
  5. Kathleen Dering, LCSWClinical Social Worker1629133871
  6. Claude Fields, LCSWClinical Social Worker1285799437

Verify Thomas Joseph O'Brien in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Connecticut board licenses this profession
    Search for license 002550    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 Connecticut 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. State OF ConnecticutHartford, CT

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

Thomas Joseph O'Brien among 1,114 clinical psychologist records in Connecticut

Thomas Joseph O'Brien, PSY D is one of 1,114 clinical psychologist records with a practice address in Connecticut. 14% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 98% newer
  • In a Medicare fileYes · 14% of these records are
  • In the CMS Doctors and Clinicians fileYes · 26% of these records are
  • Graduated2002 · median 2000 among the 294 with a school on file
  • Record last updated2008 · 72% 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 Connecticut practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

113 clinical psychologist records list a practice address in Hartford

They are 113 of the 6,317 NPPES records with a practice address in Hartford, and 1,114 clinical psychologist records in Connecticut.

All 1,114 in Connecticut → Every provider in Hartford → Clinical Psychologist nationwide →

The 8 clinical psychologist records with the nearest ZIP codes

  1. Michelle Brisman, PH.D.Hartford, CT 061121770663460
  2. Steven Brown, PSY.D.Hartford, CT 061121992753164
  3. Elizabeth Gromisch, PHDHartford, CT 061121578309613
  4. Ann Lenz, PSY.DHartford, CT 061121700060217
  5. Jennifer Paul, PHDHartford, CT 061121932298171
  6. Gary Bryson, PSYDNewington, CT 061111346358504
  7. Judith Cooney, PH.D.Newington, CT 061111841301827
  8. Sharon Cooper, PH.D.Newington, CT 061111558510883

Common questions

What is Thomas Joseph O'Brien, PSY D's NPI number?

Thomas Joseph O'Brien, PSY D's National Provider Identifier (NPI) is 1316922644, issued on Dec 9, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Thomas Joseph O'Brien, PSY D located?

The NPPES record lists a practice address at 500 Vine St, Hartford, CT, 06112. Phone: (860) 297-0852. Providers update this record themselves, so call before visiting.

How can I verify Thomas Joseph O'Brien, PSY D's license?

NPPES lists Connecticut license number 002550, as entered by the provider. Search the Connecticut 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.