Helena M. Horak, MD

Medicare activity in 2024

Official CMS public-use data for Helena M. Horak, 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. Emergency department visit with high level of medical decision making (99285)626 services
2. Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (93010)471 services
3. Critical care, first 30-74 minutes (99291)168 services
4. Emergency department visit with moderate level of medical decision making (99284)124 services
5. Emergency department visit with low level of medical decision making (99283)18 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%
• Arthritis63%
• Ischemic heart disease46%
• Heart failure40%
• Atrial fibrillation40%

Hospitals where Helena M. Horak works

Medicare's Facility Affiliation Data lists Helena M. Horak 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.

• Adventist Health Simi ValleySimi Valley, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050236
• Los Robles Hospital & Medical CenterThousand Oaks, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050549
• UCLA West Valley Medical CenterWest Hills, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 050481

Practice locations

Addresses where Helena M. Horak is enrolled with Medicare (CMS data updated October 2, 2026).

• 215 W Janss RdThousand Oaks, CA 91360 (805) 497‑2727
• 2975 Sycamore DrSimi Valley, CA 93065 (805) 955‑6000

Group practices

Medicare enrollment lists Helena M. Horak as a member of these groups (CMS data updated October 2, 2026).

• Team Physicians of California Medical Group Inc98 clinicians in the group
• Synergy Observation Specialists PC38 clinicians in the group
• Allied Emergency Physicians, Inc.15 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Thousand Oaks

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

• Jordan Roberts, DO
• Arman Sobhani, MD
• Kevin W. Wroblewski, MD
• Hamid E. Nia, DO
• Matthew Abad, DO
• Roland E. Bastian, MD
• Katie Chirkova, MD
• Marc K. Eckstein, MD

All emergency medicine doctors in Thousand Oaks →

Other clinicians in Team Physicians of California Medical Group Inc

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

• Tayler N. Strange, MD
• Jordan Roberts, DO
• Meghan R. Sampson, MD
• Bradford Commons, MD
• Arman Sobhani, MD
• Marc K. Eckstein, 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