MS. MARY K DAHILIG APN, FNP-BC
NPI 1225314990
Nurse Practitioner in Chicago, IL

Q: What is Mary Dahilig's NPI number?

The NPI number for Mary Dahilig is 1225314990. It was assigned to this individual provider in the NPPES registry on October 26, 2011.

Q: What is Mary Dahilig's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Q: When was this NPI record last updated?

The NPPES record for Mary Dahilig was last updated on May 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since October 26, 2011PECOS EnrolledAccepts Medicare Assignment

20 S CLARK ST FL 11, CHICAGO, IL 60603(312) 926-3627(312) 357-2284 Get Directions Write a Review

NPPES record last updated: May 6, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: May 6, 2025, Dec 16, 2024, Dec 13, 2024 and 2 more (5 updates tracked since 2017).

On this page

About Ms. Mary K Dahilig Apn, Fnp-bc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MS. MARY K DAHILIG APN, FNP-BC (NPI 1225314990) is an individual nurse practitioner in Chicago, Illinois, licensed in Illinois (277003870) and active in the NPI registry since October 2011. She is enrolled in Medicare PECOS, is affiliated with Northwestern Memorial Hospital, and maintains a secondary practice location in Rolling Meadows.

NPPES Registry Identity

NPI1225314990

Entity TypeIndividualFemale

Primary Taxonomy363L00000X

Provider Legal NameMS. MARY K DAHILIGCredential: APN, FNP-BC

Location Address20 S CLARK ST FL 11Chicago, IL 60603-1882

Mailing Address20 S Clark St Fl 11Chicago, IL 60603-1882 · (312) 926-3627 · Fax (312) 357-2284

Phone(312) 926-3627

Fax(312) 357-2284

Sole ProprietorNo

Medical School CMSUniversity Of Illinois College Of Med (chi/peor/rock/chm-urb)Graduated 2011

Enumeration DateOctober 26, 2011

Last NPPES UpdateMay 6, 20255 updates tracked since enumeration

NPPES CertifiedMay 6, 2025

✔ NPI 1225314990 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyNurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363L00000X

Licenses✔ Licensed in IL · 277003870✔ Licensed in IL · 209009165

Definition

(1) A registered nurse provider with a graduate degree in nursing prepared for advanced practice involving independent and interdependent decision making and direct accountability for clinical judgment across the health care continuum or in a certified specialty. (2) A registered nurse who has completed additional training beyond basic nursing education and who provides primary health care services in accordance with state nurse practice laws or statutes. Tasks performed by nurse practitioners vary with practice requirements mandated by geographic, political, economic, and social factors. Nurse practitioner specialists include, but are not limited to, family nurse practitioners, gerontological nurse practitioners, pediatric nurse practitioners, obstetric-gynecologic nurse practitioners, and school nurse practitioners.

Also ListedNurse Practitioner · FamilyTaxonomy 363LF0000X · License 209009165 (IL)

20 S CLARK ST FL 11, Chicago, IL 60603

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Secondary Practice Location 1

Location 15999 New Wilke Rd Ste 200Rolling Meadows, IL 60008-4502 · Phone (847) 618-0800

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Ms. Mary K Dahilig Apn, Fnp-bc is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID8022284959

PECOS Enrollment IDI20111227000477

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Mary Dahilig reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Endeavor Health Medical Group

13 mi

Allergy & Immunology

1000 CENTRAL ST
Evanston, IL 60201

Reassigned Medicare billing, Illinois enrollment
4,841 clinicians in this Medicare group

NPI 1497701882 (847) 570-5235

Minuteclinic Diagnostic Of Illinois PLLC

29 mi

Family

11200 W LINCOLN HWY
Mokena, IL 60448

Reassigned Medicare billing, Illinois enrollment
223 clinicians in this Medicare group

NPI 1356485809 (866) 389-2727

Northwestern Medical Faculty Foundation

34 mi

Multi-Specialty

DEPT 5777
Carol Stream, IL 60122

Reassigned Medicare billing, Illinois enrollment
4,817 clinicians in this Medicare group

NPI 1346235314 (855) 694-2866

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

24 services23 patients

New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203

This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.

21 services21 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Northwestern Memorial Hospital

Acute Care Hospitals · Chicago, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140281

Location251 E Huron StChicago, IL 60611 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60603 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$94.06 typical visit price

range $60.08 – $183.39

Typical copayment $23.51 (range $15.02 – $45.84)

Most-billed visit code 99203

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

ALYSSA RIOS PA-C

Physician Assistant

20 S CLARK ST FL 11
CHICAGO, IL 60603

Cook County (312) 926-3627

HYUN M CHO-STEINBERG MD

Internal Medicine

20 S CLARK ST FL 11
CHICAGO, IL 60603

Cook County (312) 926-3627

JESSICA MCGEE

Family Medicine

20 S CLARK ST FL 11
CHICAGO, IL 60603

Cook County (312) 926-3627

ROBIN GAYLE SCHEMMEL PA-C

Physician Assistant

20 S CLARK ST FL 11
CHICAGO, IL 60603

Cook County (312) 926-3627

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mary Dahilig's NPI number?

The NPI number for Mary Dahilig is 1225314990. It was assigned to this individual provider in the NPPES registry on October 26, 2011.

Where is Mary Dahilig located?

Mary Dahilig practices at 20 S Clark St Fl 11, Chicago, IL 60603. The listed phone number is (312) 926-3627.

What is Mary Dahilig's specialty?

The primary specialty registered for this NPI is Nurse Practitioner with taxonomy code 363L00000X.

Is Mary Dahilig enrolled in Medicare?

Yes. Mary Dahilig is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Mary Dahilig's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Dahilig reassigns Medicare benefits to 3 organizations: Endeavor Health Medical Group (Evanston, IL), Minuteclinic Diagnostic Of Illinois PLLC (Mokena, IL) and Northwestern Medical Faculty Foundation (Carol Stream, IL). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mary Dahilig's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Mary Dahilig affiliated with any hospitals?

According to CMS data, Mary Dahilig is affiliated with Northwestern Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Mary Dahilig was last updated on May 6, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.