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ASHLEY JILLIAN WILLIAMSON M.D.
NPI 1548640386
Surgery - Vascular Surgery in Chicago, IL

Active since June 07, 2015PECOS EnrolledAccepts Medicare Assignment
5841 S MARYLAND AVE # MC6040, CHICAGO, IL 60637(773) 753-1880(773) 702-2140 Get Directions Write a Review

NPPES record last updated: June 5, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 5, 2025, Sep 5, 2024 (2 updates tracked since 2024).

About Ashley Jillian Williamson M.d. NPPES

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

ASHLEY JILLIAN WILLIAMSON M.D. (NPI 1548640386) is an individual vascular surgery provider in Chicago, Illinois, licensed in Illinois (036143888) and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS, is affiliated with The University Of Chicago Medical Center, and maintains a secondary practice location in Crown Point.

NPPES Registry Identity

NPI1548640386
Entity TypeIndividualFemale
Primary Taxonomy2086S0129X
Provider Legal NameASHLEY JILLIAN WILLIAMSONCredential: M.D.
Location Address5841 S MARYLAND AVE # MC6040Chicago, IL 60637-1447
Mailing Address150 Harvester Dr Ste 300Burr Ridge, IL 60527-5965
Phone(773) 753-1880
Fax(773) 702-2140
Sole ProprietorYes
Medical School CMSOtherGraduated 2015
Enumeration DateJune 7, 2015
Last NPPES UpdateJune 5, 20252 updates tracked since enumeration
NPPES CertifiedJune 5, 2025
✔ NPI 1548640386 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtySurgery · Vascular SurgeryAllopathic & Osteopathic Physicians
Taxonomy Code2086S0129X
Licenses✔ Licensed in IL · 036143888✔ Licensed in IN · 01094916A
Definition
A surgeon with expertise in the management of surgical disorders of the blood vessels, excluding the intracranial vessels or the heart.
Also ListedSurgeryTaxonomy 208600000X · License 125066659 (IL)
5841 S MARYLAND AVE # MC6040, Chicago, IL 60637
Open in Google Maps ↗

Secondary Practice Location 1

Location 110855 Virginia StCrown Point, IN 46307-0210 · Phone (888) 824-0200

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource, Oscar Health.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

Ashley Jillian Williamson M.d. 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 ID7810290939
PECOS Enrollment IDI20240918001144, I20250107000627
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 Ashley Williamson reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The University Of Chicago Medical Center
Same address
General Acute Care Hospital
5841 S MARYLAND AVE
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois enrollment
  • 1,905 clinicians in this Medicare group
NPI 1033218128 (773) 702-1530
University Of Chicago
Same address
Multi-Specialty
5841 S MARYLAND AVE, UCPG/MC 1099
Chicago, IL 60637
  • Reassigned Medicare billing, Illinois and Indiana enrollments
  • 2,237 clinicians in this Medicare group
NPI 1821048786 (773) 702-9200
Smg South State Health Center
1.5 mi
Family Medicine
5050 S STATE ST
Chicago, IL 60609
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Mount Sinai Community Foundation
  • 646 clinicians in this Medicare group
NPI 1366787012 (773) 257-1110
The Methodist Hospitals, Inc
17 mi
Endocrinology, Diabetes & Metabolism
600 RICHARD GORDON HATCHER BLVD
Gary, IN 46402
  • Reassigned Medicare billing, Indiana enrollment
  • Also billed through NPI 1326614991 (Indiana)
  • 71 clinicians in this Medicare group
NPI 1265109227 (219) 886-4000

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 4

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.

Ultrasound study of arm or leg veins with compression and maneuvers 93970
An ultrasound study of arm or leg veins with compression and maneuvers is a non-invasive procedure that uses sound waves to create images of your veins. This helps identify blood clots or other vein problems. During the procedure, pressure is applied to the veins and certain movements are performed to assess blood flow.
36 services36 patients
Ultrasound study of arm and leg arteries 93922
An ultrasound study of arm and leg arteries is a non-invasive procedure that uses sound waves to create images of your arteries. It helps in checking blood flow, identifying blockages, or detecting other abnormalities in your arteries.
23 services23 patients
Ultrasound of both sides of head and neck blood flow 93880
An ultrasound of the head and neck blood flow is a safe, non-invasive procedure that uses sound waves to create images of blood vessels. It helps detect abnormalities like blockages or clots, ensuring optimal blood flow.
16 services16 patients
Ultrasound study of one arm or leg veins with compression and maneuvers 93971
This is a non-invasive procedure using sound waves to visualize veins in an arm or leg. It involves applying gentle pressure and performing certain movements. It helps identify any abnormal blood flow or clots, ensuring vascular health.
15 services15 patients

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

St Mary Medical Center Inc

Acute Care Hospitals · Hobart, IN
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number150034
Location1500 S Lake Park AveHobart, IN 46342 · Lake County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60637 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
$74.80 typical visit price
range $18.97 – $148.12
Typical copayment $18.70 (range $4.74 – $37.03)
Most-billed visit code 99213
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.

DR. BOBIEJO A FERGUSON BRYAN MD
Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-1000
MARCO BERTUCCI ZOCCALI MD
Colon & Rectal Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-6337
MATTHEW HARRIETH WHEELWRIGHT MD
Thoracic Surgery (Cardiothoracic Vascular Surgery)
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-2500
BRIANNA WILSON
Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-6337
TYLER WAYNE WILSON
Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-6337
HUNTER DENNIS DICKSON WITMER MD
Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-1000
MOHAMED SHAKEEB ALDALLAL
Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-6337
DR. DANIELLE THOMPSON MD
Surgery
5841 S MARYLAND AVE # MC6040
CHICAGO, IL 60637
Cook County (773) 702-6337

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 Ashley Williamson's NPI number?

The NPI number for Ashley Williamson is 1548640386. It was assigned to this individual provider in the NPPES registry on June 7, 2015.

Where is Ashley Williamson located?

Ashley Williamson practices at 5841 S Maryland Ave # Mc6040, Chicago, IL 60637. The listed phone number is (773) 753-1880.

What is Ashley Williamson's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Vascular Surgery, with taxonomy code 2086S0129X.

Is Ashley Williamson enrolled in Medicare?

Yes. Ashley Williamson 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 Ashley Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ashley Williamson reassigns Medicare benefits to 4 organizations: The University Of Chicago Medical Center (Chicago, IL), University Of Chicago (Chicago, IL), Smg South State Health Center (Chicago, IL) and The Methodist Hospitals, Inc (Gary, IN). 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 Ashley Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Ashley Williamson accept?

Health plans from CareSource and Oscar Health list Ashley Williamson 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 Ashley Williamson affiliated with any hospitals?

According to CMS data, Ashley Williamson is affiliated with The University Of Chicago Medical Center, Ingalls Memorial Hospital and St Mary Medical Center Inc.

When was this NPI record last updated?

The NPPES record for Ashley Williamson was last updated on June 5, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.