Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Dorothy Mack, Licsw LLC

Q: What type of organization is Dorothy Mack, Licsw LLC?

Dorothy Mack, Licsw LLC is registered in NPPES as a Adult Mental Health Clinic/Center (its primary provider taxonomy).

Adult Mental Health Clinic/Center in Pittsfield, MA · enumerated 2020 · authorized official Dorothy Mack, Clinician.

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

National Provider Identifier

1578150439

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Registry record

Entity type Organization (Type 2)

Legal business name Dorothy Mack, Licsw LLC

Practice address 10 Wendell Avenue Ext Ste 209, Pittsfield, MA, 01201

Phone (413) 281-0141

Enumeration date Dec 28, 2020

Last updated in NPPES Jul 2, 2021

Taxonomy & classification

261QM0850X Adult Mental Health Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Dorothy Mack

Title Clinician

Phone (413) 281-0141

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 type of organization is Dorothy Mack, Licsw LLC?

Dorothy Mack, Licsw LLC is registered in NPPES as a Adult Mental Health Clinic/Center (its primary provider taxonomy).

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-02.