Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Cornerstone Montgomery, Inc.

Q: What is the NPI number for Cornerstone Montgomery, Inc.?

The NPI for Cornerstone Montgomery, Inc. is 1245933597, a Type 2 (organization) record in the CMS NPPES registry.

Community/Behavioral Health Agency in Prince Frederick, MD · enumerated 2023 · authorized official Michael Ostrowski, Billing Manager.

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

National Provider Identifier

1245933597

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Registry record

Entity type Organization (Type 2)

Legal business name Cornerstone Montgomery, Inc.

Practice address 305 Prince Frederick Blvd, Prince Frederick, MD, 20678

Phone (410) 535-4787

Fax (410) 535-4965

Enumeration date Mar 24, 2023

Last updated in NPPES Mar 24, 2023

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.

Read the full guide → Validate an NPI →

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 1245933597, 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 2023-03-24.