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MARY ELLEN WEEG AGCNS-BC
NPI 1417765694
Clinical Nurse Specialist in New Lenox, IL

Active since December 20, 2024PECOS EnrolledAccepts Medicare Assignment
1850 SILVER CROSS BLVD, NEW LENOX, IL 60451(815) 300-5783(815) 485-4830 Get Directions Write a Review

NPPES record last updated: December 20, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Mary Ellen Weeg Agcns-bc NPPES

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

MARY ELLEN WEEG AGCNS-BC (NPI 1417765694) is an individual clinical nurse specialist in New Lenox, Illinois, licensed in Illinois (309.021859) and active in the NPI registry since December 2024. She is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and is a graduate of Other (2021).

NPPES Registry Identity

NPI1417765694
Entity TypeIndividualFemale
Primary Taxonomy364S00000X
Provider Legal NameMARY ELLEN WEEGCredential: AGCNS-BC
Location Address1850 SILVER CROSS BLVDNew Lenox, IL 60451-9508
Mailing Address1850 Silver Cross BlvdNew Lenox, IL 60451-9508 · (815) 300-5783 · Fax (815) 485-4830
Phone(815) 300-5783
Fax(815) 485-4830
Sole ProprietorNo
Medical School CMSOtherGraduated 2021
Enumeration DateDecember 20, 2024
NPPES CertifiedDecember 20, 2024
✔ NPI 1417765694 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinical Nurse SpecialistPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code364S00000X
License✔ Licensed in IL · 309.021859
Definition
A registered nurse who, through a graduate degree program in nursing, or through a formal post-basic education program or continuing education courses and clinical experience, is expert in a specialty area of nursing practice within one or more of the components of direct patient/client care, consultation, education, research and administration.
1850 SILVER CROSS BLVD, New Lenox, IL 60451
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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

Mary Ellen Weeg Agcns-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 ID4486176781
PECOS Enrollment IDI20250317000885
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

2

Medicare enrollment records show Mary Ellen Weeg reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The University Of Chicago Medical Center
26 mi
General Acute Care Hospital
5841 S MARYLAND AVE
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 635 clinicians in this Medicare group
NPI 1033218128 (773) 702-1530
University Of Chicago
26 mi
Multi-Specialty
5841 S MARYLAND AVE, UCPG/MC 1099
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 2,237 clinicians in this Medicare group
NPI 1821048786 (773) 702-9200

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

Hospital Affiliations CMS Care Compare 3

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

The University Of Chicago Medical Center

Acute Care Hospitals · Chicago, IL
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140088
Location5841 South MarylandChicago, IL 60637 · Cook County
Emergency services Birthing friendly

Ingalls Memorial Hospital

Acute Care Hospitals · Harvey, IL
2/5 CMS rating
OwnershipPhysician
CMS Certification Number140191
Location1 Ingalls DriveHarvey, IL 60426 · Cook County
Emergency services Birthing friendly

Silver Cross Hospital And Medical Centers

Acute Care Hospitals · New Lenox, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140213
Location1900 Silver Cross BlvdNew Lenox, IL 60451 · Will County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60451 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
$137.43 typical visit price
range $59.81 – $181.38
Typical copayment $34.35 (range $14.95 – $45.34)
Most-billed visit code 99204
Established Patient
$105.07 typical visit price
range $19.15 – $147.12
Typical copayment $26.26 (range $4.78 – $36.78)
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 3

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

DR. DARIO MARTIN VILLAMAR M.D.
Internal Medicine (Hematology & Oncology)
1850 SILVER CROSS BLVD
NEW LENOX, IL 60451
Will County (815) 300-1400
GABRIELA RODRIGUEZ APRN
Nurse Practitioner (Adult Health)
1850 SILVER CROSS BLVD
NEW LENOX, IL 60451
Will County (815) 300-1400
SIMONA C CHIVU MD
Internal Medicine (Hematology & Oncology)
1850 SILVER CROSS BLVD
NEW LENOX, IL 60451
Will County (815) 300-1100

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 Ellen Weeg's NPI number?

The NPI number for Mary Ellen Weeg is 1417765694. It was assigned to this individual provider in the NPPES registry on December 20, 2024.

Where is Mary Ellen Weeg located?

Mary Ellen Weeg practices at 1850 Silver Cross Blvd, New Lenox, IL 60451. The listed phone number is (815) 300-5783.

What is Mary Ellen Weeg's specialty?

The primary specialty registered for this NPI is Clinical Nurse Specialist with taxonomy code 364S00000X.

Is Mary Ellen Weeg enrolled in Medicare?

Yes. Mary Ellen Weeg 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 Ellen Weeg's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mary Ellen Weeg reassigns Medicare benefits to 2 organizations: The University Of Chicago Medical Center (Chicago, IL) and University Of Chicago (Chicago, 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 Ellen Weeg's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Mary Ellen Weeg affiliated with any hospitals?

According to CMS data, Mary Ellen Weeg is affiliated with The University Of Chicago Medical Center, Ingalls Memorial Hospital and Silver Cross Hospital And Medical Centers.

When was this NPI record last updated?

The NPPES record for Mary Ellen Weeg was last updated on December 20, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 22 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.