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TRENIKA J WILLIAMS MD, MS
NPI 1083295497
Emergency Medicine in Chicago, IL

Active since April 16, 2021PECOS EnrolledAccepts Medicare Assignment
1653 W CONGRESS PKWY, CHICAGO, IL 60612(312) 947-1000(312) 942-4021 Get Directions Write a Review

NPPES record last updated: April 10, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 10, 2026, Jan 14, 2026, Dec 29, 2025 and 2 more (5 updates tracked since 2021).

About Trenika J Williams Md, Ms NPPES

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

TRENIKA J WILLIAMS MD, MS (NPI 1083295497) is an individual emergency medicine provider in Chicago, Illinois, licensed in Illinois (036177236) and active in the NPI registry since April 2021. She is enrolled in Medicare PECOS, is affiliated with Rush University Medical Center, and maintains 2 additional practice locations.

NPPES Registry Identity

NPI1083295497
Entity TypeIndividualFemale
Primary Taxonomy207P00000X
Provider Legal NameTRENIKA J WILLIAMSCredential: MD, MS
Location Address1653 W CONGRESS PKWYChicago, IL 60612-3833
Mailing Address1653 W Congress PkwyChicago, IL 60612-3833
Phone(312) 947-1000
Fax(312) 942-4021
Sole ProprietorNo
Medical School CMSGeisel School Of Medicine At DartmouthGraduated 2021
Enumeration DateApril 16, 2021
Last NPPES UpdateApril 10, 20265 updates tracked since enumeration
NPPES CertifiedApril 10, 2026
✔ NPI 1083295497 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in IL · 036177236
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
1653 W CONGRESS PKWY, Chicago, IL 60612
Open in Google Maps ↗

Secondary Practice Locations 2

Location 12320 E 93rd StChicago, IL 60617-3909 · Phone (773) 967-5430 · Fax (773) 967-4205
Location 21000 Health Center DrMattoon, IL 61938-4644 · Phone (217) 258-2551 · Fax (217) 258-2256

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.Insurance ›

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

Trenika J Williams Md, Ms 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 ID4880096700
PECOS Enrollment IDI20251024001640
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

4

Medicare enrollment records show Trenika Williams reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Rush University Medical Center
0.1 mi
Diagnostic Radiology
1620 W HARRISON ST
Chicago, IL 60612
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Rush University Medical Group
  • 2,169 clinicians in this Medicare group
NPI 1184269425 (312) 563-4270
Advocate Health & Hospitals Corp.
2.2 mi
Emergency Medicine
3435 W VAN BUREN ST
Chicago, IL 60624
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Advocate Health And Hospitals Corporation
  • 4,870 clinicians in this Medicare group
NPI 1750315545 (773) 265-3583
Rush Oak Park ER Physicians Group
6.9 mi
Emergency Medical Services
520 S MAPLE AVE, EMERGENCY DEPARTMENT
Oak Park, IL 60304
  • Reassigned Medicare billing, Illinois enrollment
  • 124 clinicians in this Medicare group
NPI 1447260880 (708) 660-5995
Sarah Bush Lincoln Health Center
168 mi
Family Medicine
1000 HEALTH CENTER DR
Mattoon, IL 61938
  • Reassigned Medicare billing, Illinois enrollment
  • 652 clinicians in this Medicare group
NPI 1568581379 (217) 258-2525

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

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

Rush University Medical Center

Acute Care Hospitals · Chicago, IL
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140119
Location1653 West Congress ParkwayChicago, IL 60612 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 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 20

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

KAITLIN ROBLING MD
Radiology (Diagnostic Radiology)
1653 W CONGRESS PKWY
CHICAGO, IL 60612
Cook County (312) 942-5000
LAUREN ELIZABETH ARSENAULT MD
Radiology (Diagnostic Radiology)
1653 W CONGRESS PKWY
CHICAGO, IL 60612
Cook County (312) 942-5781
ALEX MICHAEL JAMES
Student in an Organized Health Care Education/Training Program
1653 W CONGRESS PKWY
CHICAGO, IL 60612
Cook County (888) 352-7874
WERNER MEIER M.D.
Pediatrics (Neonatal-Perinatal Medicine)
1653 W CONGRESS PKWY
CHICAGO, IL 60612
Cook County (312) 942-7154
UNIVERSITY PATHOLOGISTS P C
Pathology (Anatomic Pathology & Clinical Pathology)
1653 W CONGRESS PKWY
CHICAGO, IL 60612
Cook County (312) 942-5700
RUSH UNIVERSITY MEDICAL CENTER
Clinical Medical Laboratory
1653 W CONGRESS PKWY, ROOM 1188-JELKE
CHICAGO, IL 60612
Cook County (312) 942-2054
DR. PATOULA PANAGOS-BILLIRIS MD
Pediatrics (Neonatal-Perinatal Medicine)
1653 W CONGRESS PKWY, 3 PAVILLION
CHICAGO, IL 60612
Cook County (312) 942-3306
KAREN HARVEY
Nurse Practitioner (Psychiatric/Mental Health)
1653 W CONGRESS PKWY
CHICAGO, IL 60612
Cook County (312) 947-0100

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 Trenika Williams's NPI number?

The NPI number for Trenika Williams is 1083295497. It was assigned to this individual provider in the NPPES registry on April 16, 2021.

Where is Trenika Williams located?

Trenika Williams practices at 1653 W Congress Pkwy, Chicago, IL 60612. The listed phone number is (312) 947-1000.

What is Trenika Williams's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Trenika Williams enrolled in Medicare?

Yes. Trenika Williams 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 Trenika Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Trenika Williams reassigns Medicare benefits to 4 organizations: Rush University Medical Center (Chicago, IL), Advocate Health & Hospitals Corp. (Chicago, IL), Rush Oak Park ER Physicians Group (Oak Park, IL) and Sarah Bush Lincoln Health Center (Mattoon, 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 Trenika Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Trenika Williams accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Trenika Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Trenika Williams affiliated with any hospitals?

According to CMS data, Trenika Williams is affiliated with Rush University Medical Center.

When was this NPI record last updated?

The NPPES record for Trenika Williams was last updated on April 10, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.