Cornerstone Montgomery, Inc.
Cornerstone Montgomery, Inc. is a healthcare organization registered as Case Management Agency in Leonardtown, MD, holding Type 2 (organization) NPI 1689376998 since 2023. The authorized official on file is Michael Ostrowski, Billing Manager.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1689376998 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Cornerstone Montgomery, Inc. |
| Practice address | 41900 FENWICK ST, Leonardtown, MD, 20650 |
| Phone | 3014759315 |
| Fax | 3014759317 |
| Enumeration date | 2023-03-20 |
| Last updated in NPPES | 2023-03-20 |
Authorized official
| Name | Michael Ostrowski |
|---|---|
| Title | Billing Manager |
| Phone | 3014934200 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 251B00000X | Case Management Agency | Primary | — | — |
Copy-ready billing details
Provider: Cornerstone Montgomery, Inc. NPI: 1689376998 Taxonomy: 251B00000X (Case Management Agency) Address: 41900 FENWICK ST, Leonardtown, MD, 20650
Providers at this address
| NPI | Name | Type | Specialty | Location |
|---|---|---|---|---|
| 1265487888 | H Miller | Individual | Cognitive & Behavioral Psychologist | Leonardtown, MD |
| 1245346766 | Melanie Ledig | Individual | Social Worker | Leonardtown, MD |
| 1215043666 | Psychological Services Center, LLC | Organization | Counselor | Leonardtown, MD |
| 1619083110 | Jennifer Willoughby | Individual | Psychologist | Leonardtown, MD |
| 1891801304 | Paul Richard | Individual | Social Worker | Leonardtown, MD |
| 1871744946 | Psychotherapeutic Services of Southern Maryland | Organization | Case Management Agency | Leonardtown, MD |
| 1497907067 | Alissa S. Jones, Ph.D., P.A. | Organization | Psychologist | Leonardtown, MD |
| 1184958522 | Jennifer Carroll | Individual | Clinical Social Worker | Leonardtown, MD |
Verify this record
Cross-check NPI 1689376998 against the authoritative CMS record: view Cornerstone Montgomery, Inc. on the official NPPES registry .
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 or validate an NPI number.
Frequently asked questions
Where is Cornerstone Montgomery, Inc. located?
How current is this record?
Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2023-03-20.