Timothy C. Hollister, MD

Medicare activity in 2024

Official CMS public-use data for Timothy C. Hollister, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.

Most frequent services

1. Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session (G6015)1,008 services
2. Ct guidance for insertion of radiation therapy fields (77014)871 services
3. Calculation of radiation therapy dose (77300)526 services
4. Continuing radiation therapy consultation per week (77336)220 services
5. Radiation treatment management, 5 treatment sessions (77427)178 services

Chronic conditions among these patients

Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).

• High cholesterol75%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• High blood pressure73%
• Arthritis44%
• Diabetes35%
• Ischemic heart disease26%

Hospitals where Timothy C. Hollister works

Medicare's Facility Affiliation Data lists Timothy C. Hollister at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.

• Northshore University Healthsystem - Evanston HospitalEvanston, IL · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 140010

Practice locations

Addresses where Timothy C. Hollister is enrolled with Medicare (CMS data updated October 2, 2026).

• 3201 Old Glenview Rd, Suite 100Wilmette, IL 60091 (847) 673‑6505

Group practices

Medicare enrollment lists Timothy C. Hollister as a member of this group (CMS data updated October 2, 2026).

• Metro Chicago Surgical Oncology LLC13 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in Illinois →

Other radiation oncologists in Illinois

Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.

• Ross S. Zeitlin, MD
• Gary J. Schreiber, MD
• Graeme Fisher, MD
• Christopher M. Bradbury, MD
• Jeffrey M. Craft, MD
• Katherine F. Baker, MD
• Alexander Harris, MD
• Randall J. Brenneman, MD

All radiation oncologists in Illinois →

Other clinicians in Metro Chicago Surgical Oncology LLC

Medicare enrollment lists these clinicians in the same group practice — not a recommendation.

• Robert D. Zimmerman, MD
• John T. Leyland Ii, MD
• Peter T. Vaselopulos, MD
• Shahnaz Saeed, MD
• Robert S. Rosen, MD
• Allen M. Chernoff, MD

Clinician information

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

1. Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
2. Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
3. National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
4. Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
5. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
6. Medicare Care Compare — official Medicare tool to look up clinicians