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

MS. Margaret Mary Grossmayer, APRN, FNP-C

Individual provider Nurse Practitioner · NPI 1548140973

MS. Margaret Mary Grossmayer, APRN, FNP-C is a Nurse Practitioner in Willowbrook, Illinois. Qualified in 2025, 1 year ago. Practices with Midwest Express Care 2, Inc, a 219-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
1
Licensed in
IL
In the registry since
2025
What do these letters mean?
APRN — Advanced Practice Registered Nurse
The umbrella licence covering nurse practitioners, midwives, anaesthetists and clinical nurse specialists.
FNP-C — Family Nurse Practitioner, Certified
A family nurse practitioner certified by the AANP.

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Practice location Address checks out

40 75th St
Willowbrook, IL 60527-2325
Phone: (630) 581-5372
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nurse Practitioner (primary) Taxonomy 363L00000X · Licence 209033129 (IL)

Record details

NPI number1548140973
Entity typeIndividual (Type 1)
GenderFemale
Credentials APRN , FNP-C
Sole proprietorYes
NPI enumeratedSeptember 5, 2025
Last updated in NPPESNovember 26, 2025
Certification dateNovember 26, 2025

Medicare enrollment

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

Medicare specialtyNURSE PRACTITIONER
Medical schoolOTHER
Graduated 2025 (1 years in practice)
Group practice Midwest Express Care 2, Inc — 219 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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