George B. Semeniuk, MD

Medicare activity in 2024

Official CMS public-use data for George B. Semeniuk, 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. Injection, pembrolizumab, 1 mg (J9271)23,400 services
2. Injection, romosozumab-aqqg, 1 mg (J3111)5,670 services
3. Injection, immune globulin, (gammagard liquid), non-lyophilized, (e.g., liquid), 500 mg (J1569)4,820 services
4. Injection, denosumab, 1 mg (J0897)3,900 services
5. Injection, aprepitant, 1 mg (J0185)3,640 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%
• High blood pressure74%
• Arthritis54%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)37%
• Osteoporosis29%
• Ischemic heart disease28%

Hospitals where George B. Semeniuk works

Medicare's Facility Affiliation Data lists George B. Semeniuk 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.

• Hoag Memorial Hospital PresbyterianNewport Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050224

Practice locations

Addresses where George B. Semeniuk is enrolled with Medicare (CMS data updated October 2, 2026).

• 1601 Avocado AveNewport Beach, CA 92660 (949) 763‑2204

Group practices

Medicare enrollment lists George B. Semeniuk as a member of this group (CMS data updated October 2, 2026).

• City of Hope Medical Foundation982 clinicians in the group

Specialties

• Hematology/Oncologyprimary

Find other Hematology/Oncology doctors in California →

Other hematologist-oncologists in Newport Beach

Clinicians with the same Medicare primary specialty in Newport Beach, CA — not a recommendation.

• Umair U. Ghani, MD
• Sharmeen Mahmood, DO
• Monica Mita, MD
• Benjamin Goldenson, MD
• Greg R. Angstreich, MD
• Irina Sachelarie, MD
• Andrea Stebel, MD
• Raghuveer Ranganathan, MD

All hematologist-oncologists in Newport Beach →

Other clinicians in City of Hope Medical Foundation

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

• Linda D. Bosserman, MD
• Stephanie Yoon, MD
• Yasmin Zerhouni, MD
• Annette M. Isozaki, NP
• Nancy Y. Christiano, CNA
• Shivani Shodhan, 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