Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Catherine Jean Ryan, PHD, RN, APN, CCRN

Individual provider Critical Care Medicine Clinical Nurse Specialist · NPI 1982918496

Catherine Jean Ryan, PHD, RN, APN, CCRN is a Critical Care Medicine Clinical Nurse Specialist in Chicago, Illinois. Licensed in Illinois. Registered with an NPI since 2010.

Licensed in
IL
In the registry since
2010
What do these letters mean?
PHD — Doctor of Philosophy
A research doctorate. In healthcare it usually sits alongside a clinical licence.
RN — Registered Nurse
A licensed nurse who completed a nursing degree and passed the NCLEX-RN examination.
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 →

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Practice location Address checks out

845 S Damen Ave Mc 802 Rm 744
Chicago, IL 60612-3727
Phone: (312) 996-2180
Fax: (312) 996-4979
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Critical Care Medicine Clinical Nurse Specialist (primary) Taxonomy 364SC0200X · Licence 041194116 (IL)

Record details

NPI number1982918496
Entity typeIndividual (Type 1)
GenderFemale
Credentials PHD , RN , APN , CCRN
Sole proprietorNo
NPI enumeratedJuly 27, 2010
Last updated in NPPESJuly 27, 2010
Mailing address845 S Damen Ave, Mc 802 Room 744, Chicago, IL 60612-3727

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