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

Mary J Harker, APN

Individual provider Nurse Practitioner · NPI 1649410994

Mary J Harker, APN is a Nurse Practitioner in Belvidere, Illinois. Licensed in Illinois. Registered with an NPI since 2009.

Licensed in
IL
In the registry since
2009
What do these letters mean?
APN — Advanced Practice Nurse
The umbrella title some states use for nurse practitioners and other advanced practice nurses.

See every abbreviation used in this directory →

Practice location Address checks out

230 W Chrysler Dr
Belvidere, IL 61008-6304
Phone: (866) 825-3227
Show map & directions

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

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 209000739 (IL)

Record details

NPI number1649410994
Entity typeIndividual (Type 1)
GenderFemale
Credentials APN
Sole proprietorNo
NPI enumeratedFebruary 26, 2009
Last updated in NPPESFebruary 26, 2009

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