NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Dwinnells Behavioral Health LLC

Mental Health Counselor in Holliston, MA · enumerated 2025 · authorized official William Dwinnells, Owner.

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

National Provider Identifier

1164222519

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Dwinnells Behavioral Health LLC
Practice address 360 Woodland St, Holliston, MA, 01746
Phone (978) 254-4119
Fax (508) 371-9215
Enumeration date Mar 14, 2025
Last updated in NPPES Mar 14, 2025

Taxonomy & classification

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers Primary

Authorized official

Name William Dwinnells
Title Owner
Phone (978) 254-4119

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

Who is the authorized official for Dwinnells Behavioral Health LLC?
NPPES lists William Dwinnells (Owner) as the authorized official for this organization.
What is the NPI number for Dwinnells Behavioral Health LLC?
The NPI for Dwinnells Behavioral Health LLC is 1164222519, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-03-14.