Mcdonald & O'Callaghan, P.A.
Mcdonald & O'Callaghan, P.A. is a healthcare organization registered as Clinical Psychologist in Arnold, MD, holding Type 2 (organization) NPI 1265553879 since 2007. The authorized official on file is P Gayle O'Callaghan, President.
✓ Active NPI ✓ Valid NPI checksum
| NPI | 1265553879 |
|---|---|
| Entity type | Organization (Type 2) |
| Legal business name | Mcdonald & O'Callaghan, P.A. |
| Practice address | 1521 RITCHIE HWY STE 3E, Arnold, MD, 21012 |
| Phone | 4107579311 |
| Enumeration date | 2007-04-02 |
| Last updated in NPPES | 2020-08-22 |
Authorized official
| Name | P Gayle O'Callaghan |
|---|---|
| Title | President |
| Phone | 4107579311 |
Taxonomy & classification
| Taxonomy code | Specialty | Primary | License | State |
|---|---|---|---|---|
| 103TC0700X | Clinical Psychologist | Primary | 1753 | MD |
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| NO IDENTIFICATION # | Other | MD | NO DESCRIPTION KNOWN |
Copy-ready billing details
Provider: Mcdonald & O'Callaghan, P.A. NPI: 1265553879 Taxonomy: 103TC0700X (Clinical Psychologist) Address: 1521 RITCHIE HWY STE 3E, Arnold, MD, 21012
Verify this record
Cross-check NPI 1265553879 against the authoritative CMS record: view Mcdonald & O'Callaghan, P.A. 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
Who is the authorized official for Mcdonald & O'Callaghan, P.A.?
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Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2020-08-22.