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Cornerstone Montgomery, Inc.

Mental Illness Community Based Residential Treatment Facility in Silver Spring, MD · enumerated 2020 · authorized official Michael Ostrowski, Billing Supervisor.

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

National Provider Identifier

1235730037

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Registry record

Entity type Organization (Type 2)
Legal business name Cornerstone Montgomery, Inc.
Practice address 14531 Layhill Rd, Silver Spring, MD, 20906
Phone (301) 598-3400
Enumeration date Nov 6, 2020
Last updated in NPPES Nov 6, 2020

Taxonomy & classification

320800000X Mental Illness Community Based Residential Treatment Facility Residential Treatment Facilities 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 type of organization is Cornerstone Montgomery, Inc.?
Cornerstone Montgomery, Inc. is registered in NPPES as a Mental Illness Community Based Residential Treatment Facility (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 2020-11-06.