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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

WILLIAM ROYSTER MD, PHD
NPI 1093160855
Surgery - Surgical Oncology in Park Ridge, IL

Active since April 29, 2016PECOS Enrolled
1875 DEMPSTER ST STE 465, PARK RIDGE, IL 60068(847) 318-9071 Get Directions Write a Review

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

Record update history: Sep 18, 2026, Jul 31, 2026, May 27, 2025 and 1 more (4 updates tracked since 2024).

About William Royster Md, Phd NPPES

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

WILLIAM ROYSTER MD, PHD (NPI 1093160855) is an individual surgical oncology provider in Park Ridge, Illinois, licensed in Illinois (036178261) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1093160855
Entity TypeIndividualMale
Primary Taxonomy2086X0206X
Provider Legal NameWILLIAM ROYSTERCredential: MD, PHD
Location Address1875 DEMPSTER ST STE 465Park Ridge, IL 60068-1129
Mailing Address29373 Network PlChicago, IL 60673-1293 · (847) 390-5900
Phone(847) 318-9071
Sole ProprietorNo
Enumeration DateApril 29, 2016
Last NPPES UpdateSeptember 18, 20264 updates tracked since enumeration
NPPES CertifiedSeptember 18, 2026
✔ NPI 1093160855 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySurgery · Surgical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code2086X0206X
License✔ Licensed in IL · 036178261
Definition
A surgical oncologist is a well-qualified surgeon who has obtained additional training and experience in the multidisciplinary approach to the prevention, diagnosis, treatment, and rehabilitation of cancer patients, and devotes a major portion of his or her professional practice to these activities and cancer research.
1875 DEMPSTER ST STE 465, Park Ridge, IL 60068
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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 (PECOS)

William Royster Md, Phd is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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 Reassignment

Medicare enrollment records show William Royster reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Lutheran General Hospital
0.1 mi
Cardiovascular Disease
1775 DEMPSTER ST
Park Ridge, IL 60068
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Advocate Health And Hospitals Corporation
  • 4,870 clinicians in this Medicare group
NPI 1801809306 (847) 723-2210

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60068 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
$183.39 typical visit price
range $60.08 – $183.39
Typical copayment $45.84 (range $15.02 – $45.84)
Most-billed visit code 99205
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 16

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

DR. VEENA HAMILL MD
Obstetrics & Gynecology
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 825-1100
DAISY OCEGUERA MD
Obstetrics & Gynecology
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 825-1100
SASHA NUHN
Obstetrics & Gynecology
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 825-1100
MERIT NASSIF MD, FACOG
Obstetrics & Gynecology
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (732) 642-3144
DR. MEGAN ELIZABETH DONZELLI DO
Obstetrics & Gynecology
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 825-1100
SOPHIE CAROLYN DRESCHER PA-C
Physician Assistant
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 318-9071
ELIJAH MORRIS DO
Obstetrics & Gynecology
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 825-1100
DR. MARIN NIKOLOV MARINOV M.D.
Surgery
1875 DEMPSTER ST STE 465
PARK RIDGE, IL 60068
Cook County (847) 318-9071

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 William Royster's NPI number?

The NPI number for William Royster is 1093160855. It was assigned to this individual provider in the NPPES registry on April 29, 2016.

Where is William Royster located?

William Royster practices at 1875 Dempster St Ste 465, Park Ridge, IL 60068. The listed phone number is (847) 318-9071.

What is William Royster's specialty?

The primary specialty registered for this NPI is Surgery, specializing in Surgical Oncology, with taxonomy code 2086X0206X.

Is William Royster enrolled in Medicare?

Yes. William Royster is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for William Royster's services?

According to the CMS Revalidation Reassignment List (October 2026 release), William Royster reassigns Medicare benefits to Lutheran General Hospital (Park Ridge, IL). The 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 William Royster's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for William Royster was last updated on September 18, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 32 days 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.