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STEPHEN JOSEPH WILLIAMS JR.
NPI 1801356845
Radiology - Diagnostic Radiology in Milwaukee, WI

Active since March 25, 2019PECOS EnrolledAccepts Medicare Assignment
9200 W WISCONSIN AVE, MILWAUKEE, WI 53226(414) 805-2060(414) 259-9290 Get Directions Write a Review

NPPES record last updated: March 29, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Stephen Joseph Williams Jr. NPPES

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

STEPHEN JOSEPH WILLIAMS JR. (NPI 1801356845) is an individual diagnostic radiology provider in Milwaukee, Wisconsin, licensed in Wisconsin (75935) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with Waukesha Memorial Hospital, and is a graduate of Other (2019).

NPPES Registry Identity

NPI1801356845
Entity TypeIndividualMale
Primary Taxonomy2085R0202X
Provider Legal NameSTEPHEN JOSEPH WILLIAMS JR.
Location Address9200 W WISCONSIN AVEMilwaukee, WI 53226-3522
Mailing Address9200 W Wisconsin AveMilwaukee, WI 53226-3522 · (414) 805-2060 · Fax (414) 259-9290
Phone(414) 805-2060
Fax(414) 259-9290
Sole ProprietorNo
Medical School CMSOtherGraduated 2019
Enumeration DateMarch 25, 2019
Last NPPES UpdateMarch 29, 2024
NPPES CertifiedMarch 27, 2024
✔ NPI 1801356845 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Diagnostic RadiologyAllopathic & Osteopathic Physicians
Taxonomy Code2085R0202X
License✔ Licensed in WI · 75935
Definition
A radiologist who utilizes x-ray, radionuclides, ultrasound and electromagnetic radiation to diagnose and treat disease.
9200 W WISCONSIN AVE, Milwaukee, WI 53226
Open in Google Maps ↗

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include CareSource (Common Ground Healthcare), Group Health Cooperative-SCW.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

Stephen Joseph Williams Jr. 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 ID9638505241
PECOS Enrollment IDI20240607000680
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 Stephen Williams reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

The Medical College Of Wisconsin, Inc.
0.5 mi
Internal Medicine
8701 WATERTOWN PLANK RD
Milwaukee, WI 53226
  • Reassigned Medicare billing, Wisconsin enrollment
  • 3,983 clinicians in this Medicare group
NPI 1699720086 (414) 955-7101
Prohealth Medical Group Inc
4.7 mi
Family Medicine
13900 W NATIONAL AVE
New Berlin, WI 53151
  • Reassigned Medicare billing, Wisconsin enrollment
  • 528 clinicians in this Medicare group
NPI 1962543728 (262) 928-4500
Froedtert & the Medical College Of Wisconsin Community Physicians, Inc.
10 mi
Internal Medicine
W180N8000 TOWN HALL RD
Menomonee Falls, WI 53051
  • Reassigned Medicare billing, Wisconsin enrollment
  • 2,294 clinicians in this Medicare group
NPI 1568787448 (262) 255-2500
Radiology Waukesha S.C.
11 mi
Diagnostic Radiology
725 AMERICAN AVE
Waukesha, WI 53188
  • Reassigned Medicare billing, Wisconsin enrollment
  • Medicare enrollment name: Radiology Waukesha Sc
  • 35 clinicians in this Medicare group
NPI 1730175258 (262) 928-2400

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 3

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.

X-ray of abdomen, 1 view 74018
An X-ray of the abdomen, 1 view, is a quick and painless imaging test. It uses a small amount of radiation to produce images of the structures in your abdomen, such as the stomach, liver, and intestines. This can help identify issues like blockages, infections, or injuries.
23 services22 patients
Ct scan of abdomen and pelvis with contrast 74177
A CT scan of the abdomen and pelvis with contrast is an imaging procedure. A special dye, called contrast, is used to make certain areas more visible. This can help identify issues such as infections, tumors, or other abnormalities. The procedure is painless and usually takes about 30 minutes.
21 services21 patients
Limited ultrasound scan of abdomen 76705
A limited ultrasound scan of the abdomen is a non-invasive imaging test. It uses sound waves to produce images of the abdominal organs such as the liver, gallbladder, spleen, pancreas, and kidneys. This helps to identify any abnormalities or issues.
14 services13 patients

Hospital Affiliations CMS Care Compare 3

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

Waukesha Memorial Hospital

Acute Care Hospitals · Waukesha, WI
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520008
Location725 American AveWaukesha, WI 53188 · Waukesha County
Emergency services Birthing friendly

Oconomowoc Memorial Hospital

Acute Care Hospitals · Oconomowoc, WI
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520062
Location791 E Summit AveOconomowoc, WI 53066 · Waukesha County
Emergency services Birthing friendly

Watertown Memorial Hospital

Acute Care Hospitals · Watertown, WI
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number520116
Location125 Hospital DriveWatertown, WI 53098 · Dodge County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 53226 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
$82.92 typical visit price
range $53.90 – $163.24
Typical copayment $20.73 (range $13.47 – $40.81)
Most-billed visit code 99203
Established Patient
$67.37 typical visit price
range $17.40 – $133.76
Typical copayment $16.84 (range $4.35 – $33.44)
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.

TRACY BLAIR WANDTKE HERRMANN APNP, CNM
Advanced Practice Midwife
9200 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 805-4777
DR. ZACHARY SMITH DO
Internal Medicine (Gastroenterology)
9200 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 955-6830
DR. COLLEEN ANN CROWE M.D., M.P.H.
Emergency Medicine
9200 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 805-6469
ROBERTO MEJIAS APNP
Nurse Practitioner (Pediatrics)
9200 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 805-6600
MRS. ANNE E B LAKATOS APN-BC, APNP, RN
Nurse Practitioner (Adult Health)
9200 W WISCONSIN AVE, DEPT OF INTERNAL MEDICINE
MILWAUKEE, WI 53226
Milwaukee County (414) 805-6850
MRS. AMANDA M MANDERS APNP
Nurse Practitioner (Adult Health)
9200 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 805-6850
KATHLEEN A WATERHOUSE-SKIBICKI CRNA
Nurse Anesthetist, Certified Registered
9200 W WISCONSIN AVE
MILWAUKEE, WI 53226
Milwaukee County (414) 805-5951
ANDREA L BEQUEST PA
Physician Assistant (Medical)
9200 W WISCONSIN AVE, INTERNAL MEDICINE
MILWAUKEE, WI 53226
Milwaukee County (414) 955-0350

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 Stephen Williams's NPI number?

The NPI number for Stephen Williams is 1801356845. It was assigned to this individual provider in the NPPES registry on March 25, 2019.

Where is Stephen Williams located?

Stephen Williams practices at 9200 W Wisconsin Ave, Milwaukee, WI 53226. The listed phone number is (414) 805-2060.

What is Stephen Williams's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.

Is Stephen Williams enrolled in Medicare?

Yes. Stephen 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 Stephen Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Williams reassigns Medicare benefits to 4 organizations: The Medical College Of Wisconsin, Inc. (Milwaukee, WI), Prohealth Medical Group Inc (New Berlin, WI), Froedtert & the Medical College Of Wisconsin Community Physicians, Inc. (Menomonee Falls, WI) and Radiology Waukesha S.C. (Waukesha, WI). 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 Stephen Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Williams accept?

Health plans from CareSource (Common Ground Healthcare) and Group Health Cooperative-SCW list Stephen 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 Stephen Williams affiliated with any hospitals?

According to CMS data, Stephen Williams is affiliated with Waukesha Memorial Hospital, Oconomowoc Memorial Hospital and Watertown Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Stephen Williams was last updated on March 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.