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

Mary T Johnston, RN

Individual provider Registered Nurse First Assistant · NPI 1659595494

Mary T Johnston, RN is a Registered Nurse First Assistant in Naperville, Illinois. Licensed in Illinois. Registered with an NPI since 2007.

Licensed in
IL
In the registry since
2007
What do these letters mean?
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.

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Practice location Address checks out

120 Osler Dr
Naperville, IL 60540
Phone: (630) 428-2229
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Registered Nurse First Assistant (primary) Taxonomy 163WR0006X · Licence 41199041 (IL)

Record details

NPI number1659595494
Entity typeIndividual (Type 1)
GenderFemale
Credentials RN
Sole proprietorNo
NPI enumeratedApril 12, 2007
Last updated in NPPESJuly 8, 2007
Mailing address27555 Diehl Rd., Entrance B, Warrenville, IL 60555

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