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

Mrs. Mary Colleen Welles, APN

Individual provider Oncology Clinical Nurse Specialist · NPI 1366768764

Mrs. Mary Colleen Welles, APN is a Certified Clinical Nurse Specialist (Cns) in Chicago, Illinois. Graduated from Rush Medical College of Rush University in 1994, 32 years ago. Practices with Northwestern Medical Faculty Foundation, a 4,394-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
32
Trained at
Rush Medical College of Rush University
Licensed in
IL
In the registry since
2010
What do these letters mean?
APN — Advanced Practice Nurse
The umbrella title some states use for nurse practitioners and other advanced practice nurses.

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Practice location Address checks out

676 N Saint Clair St Ste 2125
Chicago, IL 60611-2927
Phone: (312) 926-5400
Fax: (312) 926-8885
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Oncology Clinical Nurse Specialist (primary) Taxonomy 364SX0200X · Licence 209.002324 (IL)

Record details

NPI number1366768764
Entity typeIndividual (Type 1)
GenderFemale
Credentials APN
Sole proprietorNo
NPI enumeratedApril 12, 2010
Last updated in NPPESApril 12, 2010

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCERTIFIED CLINICAL NURSE SPECIALIST (CNS)
Medical schoolRUSH MEDICAL COLLEGE OF RUSH UNIVERSITY
Graduated 1994 (32 years in practice)
Group practice Northwestern Medical Faculty Foundation — 4394 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations4 on file with Medicare

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