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Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum Organization subpart

Cornerstone Montgomery, Inc.

Community/Behavioral Health Agency in Rockville, MD · enumerated 2019 · authorized official Michael Ostrowski, Billing Supervisor.

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

National Provider Identifier

1376181750

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Registry record

Entity type Organization (Type 2)
Legal business name Cornerstone Montgomery, Inc.
Parent organization Cornerstone Montgomery, Inc.
Practice address 2 Taft Ct Ste 200, Rockville, MD, 20850
Phone (301) 493-4200
Fax (888) 496-8354
Enumeration date Dec 16, 2019
Last updated in NPPES Dec 16, 2019

Taxonomy & classification

251S00000X Community/Behavioral Health Agency Agencies Primary

Authorized official

Name Michael Ostrowski
Title Billing Supervisor
Phone (301) 493-4200

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 the NPI number for Cornerstone Montgomery, Inc.?
The NPI for Cornerstone Montgomery, Inc. is 1376181750, a Type 2 (organization) record in the CMS NPPES registry.
Who is the authorized official for Cornerstone Montgomery, Inc.?
NPPES lists Michael Ostrowski (Billing Supervisor) as the authorized official for this organization.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-12-16.