Kathleen C. Horst, MD

Medicare activity in 2024

Official CMS public-use data for Kathleen C. Horst, 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. Design and construction of complex radiation treatment device (77334)299 services
2. Calculation of radiation therapy dose (77300)264 services
3. Radiation treatment management, 5 treatment sessions (77427)162 services
4. Ct guidance for insertion of radiation therapy fields (77014)92 services
5. Complex radiation therapy planning (77263)76 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).

• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• High cholesterol72%
• High blood pressure62%
• Arthritis34%
• Osteoporosis26%
• Diabetes22%

Hospitals where Kathleen C. Horst works

Medicare's Facility Affiliation Data lists Kathleen C. Horst 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.

• Stanford Health CareStanford, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050441
• Stanford Health Care Tri-ValleyPleasanton, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050283

Practice locations

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

• 300 Pasteur DrStanford, CA 94305 (650) 723‑4000

Group practices

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

• Stanford Health Care3,122 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in California →

Other radiation oncologists in Stanford

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

• Michael F. Gensheimer, MD
• Nicholas Trakul, MD
• John K. Byun, MD
• Elizabeth A. Kidd, MD
• Billy W. Loo, MD
• Richard T. Hoppe, MD
• Maximilian Diehn, MD
• Yushen Qian, MD

All radiation oncologists in Stanford →

Other clinicians in Stanford Health Care

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

• Daniel S. Kim, MD
• Michael Lim, MD
• Reena P. Thomas, MD
• Christine K. Santiago, MD
• Alai Alvarez, MD
• Venita Chandra, 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