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

Mary Deirdre Johnston, MD

Individual provider Geriatric Psychiatry Physician · NPI 1881670958

Mary Deirdre Johnston, MD is a Geriatric Psychiatry Physician in Baltimore, Maryland. Licensed in North Carolina. Registered with an NPI since 2005.

Licensed in
NC
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

600 N Wolfe Street Johns Hopkins University School Of Medicine
Baltimore, MD 21287-7279
Phone: (410) 955-5147
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Geriatric Psychiatry Physician (primary) Taxonomy 2084P0805X · Licence 9500105 (NC)

Record details

NPI number1881670958
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedDecember 20, 2005
Last updated in NPPESSeptember 18, 2012

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