Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Peter Edward Obrien, LICSW

Clinical Social Worker in Dalton, MA · enumerated 2018.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1487139416

Verified

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Registry record

Entity type Individual (Type 1)

Name Peter Edward Obrien

Credential LICSW

Sex Male

Practice address Dalton, MA, 01226

Phone (413) 684-0780

Enumeration date Sep 25, 2018

Last updated in NPPES Sep 25, 2018

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1021873 (MA) Secondary

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1021873-SW-LICSW (MA) Primary

Other identifiers

Identifier	Type	State	Issuer
1021873	Medicaid	MA	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Peter Obrien?

Peter Obrien is registered in NPPES with the primary taxonomy of Clinical Social Worker. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-09-25.