Sylvia G. Zubyk, MD

Medicare activity in 2024

Official CMS public-use data for Sylvia G. Zubyk, 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. Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy (G6002)1,113 services
2. Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session (G6015)862 services
3. Radiation treatment delivery,3 or more separate treatment areas, custom blocking, tangential ports, wedges, rotational beam, compensators, electron beam; 11-19 mev (G6013)400 services
4. Calculation of radiation therapy dose (77300)329 services
5. Design and construction of complex radiation treatment device (77334)241 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 blood pressure75%
• High cholesterol75%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• Arthritis42%
• Ischemic heart disease34%
• Diabetes27%

Hospitals where Sylvia G. Zubyk works

Medicare's Facility Affiliation Data lists Sylvia G. Zubyk 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.

• Methodist HospitalSan Antonio, TX · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 450388

Practice locations

Addresses where Sylvia G. Zubyk is enrolled with Medicare (CMS data updated October 2, 2026).

• 155 E Sonterra Blvd, Suite 200San Antonio, TX 78258 (210) 593‑5700
• 4383 Medical DrSan Antonio, TX 78229 (210) 593‑5700
• 502 Madison Oak Dr, Suite 120San Antonio, TX 78258 (210) 593‑5700

Group practices

Medicare enrollment lists Sylvia G. Zubyk as a member of this group (CMS data updated October 2, 2026).

• South Texas Oncology and Hematology, PLLC41 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in Texas →

Other radiation oncologists in San Antonio

Clinicians with the same Medicare primary specialty in San Antonio, TX — not a recommendation.

• Amy Le, MD
• Chul S. Ha, MD
• Timothy W. Dziuk, MD
• Gary D. Lewis, MD
• Ardow R. Ameduri, MD
• Neil C. Chevli, MD
• Shraddha M. Dalwadi, MD
• Joaquin G. Mira, MD

All radiation oncologists in San Antonio →

Other clinicians in South Texas Oncology and Hematology, PLLC

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

• Joseph R. Karam, MD
• Jaron E. Mark, MD
• Gladys I. Rodriguez, MD
• Drew W. Rasco, MD
• Amita Patnaik, MD
• Hanni Salih, 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