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LUKE B O'BRIEN
NPI 1366062861
Social Worker in Willimantic, CT

Active since April 24, 2020PECOS Enrolled
1491 MAIN ST, WILLIMANTIC, CT 06226(860) 731-5522 Get Directions Write a Review

NPPES record last updated: April 24, 2020. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Luke B O'brien NPPES

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

LUKE B O'BRIEN (NPI 1366062861) is an individual social worker in Willimantic, Connecticut and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1366062861
Entity TypeIndividualMale
Primary Taxonomy104100000X
Provider Legal NameLUKE B O'BRIEN
Location Address1491 MAIN STWillimantic, CT 06226-1914
Mailing Address2 Waterside Xing Ste 401Windsor, CT 06095-1588 · (860) 731-5522
Phone(860) 731-5522
Sole ProprietorNo
Enumeration DateApril 24, 2020
NPPES CertifiedApril 24, 2020
✔ NPI 1366062861 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySocial WorkerBehavioral Health & Social Service Providers
Taxonomy Code104100000X
Definition
A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.
1491 MAIN ST, Willimantic, CT 06226
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Luke B O'brien is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment– Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Luke O'brien reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Natchaug Hospital, Inc.
2.6 mi
Psychiatric Hospital
189 STORRS ROAD
Mansfield Center, CT 06250
  • Reassigned Medicare billing, Connecticut enrollment
  • 200 clinicians in this Medicare group
NPI 1295811321 (860) 456-1311

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Other Providers at the Same Location NPPES 17

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

WILLIAM BERGMANN
Counselor
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215
RYAN TACY
Counselor
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215
LISA HEIDTMANN
Counselor (Mental Health)
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215
LIZ SANCHEZ
Counselor
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215
TERRENCE SMITH LADC
Counselor (Addiction (Substance Use Disorder))
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-1769
KELLI GUSTAVSON
Counselor (Mental Health)
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215
ERIN PARFITT
Counselor (Mental Health)
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215
ELIZABETH KELLERT
Social Worker
1491 MAIN ST
WILLIMANTIC, CT 06226
Southeastern Connecticut Planning Region (860) 456-3215

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 Luke O'brien's NPI number?

The NPI number for Luke O'brien is 1366062861. It was assigned to this individual provider in the NPPES registry on April 24, 2020.

Where is Luke O'brien located?

Luke O'brien practices at 1491 Main St, Willimantic, CT 06226. The listed phone number is (860) 731-5522.

What is Luke O'brien's specialty?

The primary specialty registered for this NPI is Social Worker with taxonomy code 104100000X.

Is Luke O'brien enrolled in Medicare?

Yes. Luke O'brien is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Luke O'brien's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Luke O'brien reassigns Medicare benefits to Natchaug Hospital, Inc. (Mansfield Center, CT). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Luke O'brien's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Luke O'brien was last updated on April 24, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.