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

Diana Guillaume, NP

Individual provider Adult Health Nurse Practitioner · NPI 1396037685

Diana Guillaume, NP is a Nurse Practitioner in Skokie, Illinois. Qualified in 2009, 17 years ago. Practices with Oak Street Health Physicians Group PC, a 234-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
17
Licensed in
IL
In the registry since
2011
What do these letters mean?
NP — Nurse Practitioner
An advanced practice nurse who can diagnose, treat and in most states prescribe.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

4120 Dempster St
Skokie, IL 60076-2101
Phone: (224) 601-7032
Fax: (224) 257-7432
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

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

Specialties & licences

Adult Health Nurse Practitioner (primary) Taxonomy 363LA2200X · Licence 277.005282 (IL)

Record details

NPI number1396037685
Entity typeIndividual (Type 1)
GenderFemale
Credentials NP
Sole proprietorNo
NPI enumeratedMay 5, 2011
Last updated in NPPESApril 14, 2026
Certification dateApril 14, 2026

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2009 (17 years in practice)
Group practice Oak Street Health Physicians Group Pc — 234 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients48
Services billed 182 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Oak Street Health Physicians Group PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 234 clinicians in the practice; 12 are shown here.

Other providers in Skokie