Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

McDonald & O'Callaghan, PA

Organization Clinical Psychologist · NPI 1265553879

McDonald & O'Callaghan, PA is a Clinical Psychologist in Arnold, Maryland. Licensed in Maryland. Registered with an NPI since 2007.

Licensed in
MD
In the registry since
2007
What do these letters mean?
PA — Professional association
A form of business registration, not a clinical qualification.

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Practice location Address checks out

1521 Ritchie Hwy Ste 3E
Arnold, MD 21012-2747
Phone: (410) 757-9311
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Clinical Psychologist (primary) Taxonomy 103TC0700X · Licence 1753 (MD)

Record details

NPI number1265553879
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official P Gayle O'Callaghan — President · (410) 757-9311
NPI enumeratedApril 2, 2007
Last updated in NPPESAugust 22, 2020
Mailing addressPo Box 9708, 1521 Ritchie Highway Suite 3e, Arnold, MD 21012-0708

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