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Cornerstone Montgomery, Inc.

Community/Behavioral Health Agency in Waldorf, MD · enumerated 2022 · authorized official Michael Ostrowski, Billing Manager.

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

National Provider Identifier

1700596921

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Registry record

Entity type Organization (Type 2)
Legal business name Cornerstone Montgomery, Inc.
Practice address 2670 Crain Hwy Ste 505, Waldorf, MD, 20601
Phone (301) 932-9146
Fax (301) 932-9361
Enumeration date Nov 29, 2022
Last updated in NPPES Nov 29, 2022

Taxonomy & classification

251S00000X Community/Behavioral Health Agency Agencies Primary

Authorized official

Name Michael Ostrowski
Title Billing Manager
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

Who is the authorized official for Cornerstone Montgomery, Inc.?
NPPES lists Michael Ostrowski (Billing Manager) as the authorized official for this organization.
What is the NPI number for Cornerstone Montgomery, Inc.?
The NPI for Cornerstone Montgomery, Inc. is 1700596921, a Type 2 (organization) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-11-29.