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Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William Mitchell Jr, LLC

Ambulatory Surgical Clinic/Center in Wellesley, MA · enumerated 2014 · authorized official Matthew Dupee, Practice Administrator.

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

National Provider Identifier

1881008670

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Registry record

Entity type Organization (Type 2)
Legal business name William Mitchell Jr, LLC
Practice address 65 Walnut St, Suite 440, Wellesley, MA, 02481
Phone (781) 235-9089
Enumeration date Jun 19, 2014
Last updated in NPPES Jun 19, 2014

Taxonomy & classification

261QA1903X Ambulatory Surgical Clinic/Center Ambulatory Health Care Facilities Primary

Authorized official

Name Matthew Dupee
Title Practice Administrator
Phone (781) 235-9089

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.

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Frequently asked questions

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.
What type of organization is William Mitchell Jr, LLC?
William Mitchell Jr, LLC is registered in NPPES as a Ambulatory Surgical Clinic/Center (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-06-19.