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

Cornerstone Montgomery, Inc.

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

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

National Provider Identifier

1184262560

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Registry record

Entity type Organization (Type 2)

Legal business name Cornerstone Montgomery, Inc.

Parent organization Cornerstone Montgomery, Inc.

Practice address 1398 Lamberton Dr, Silver Spring, MD, 20902

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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where is Cornerstone Montgomery, Inc. located?

The practice location on file with NPPES is in Silver Spring, MD.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2019-12-16. Verify at npiregistry.cms.hhs.gov.

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