Elena A. Kossyreva, MD

Medicare activity in 2024

Official CMS public-use data for Elena A. Kossyreva, 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)30 services
2. Emergency department visit with moderate level of medical decision making (99284)17 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 cholesterol60%
• Arthritis50%
• Diabetes44%
• Heart failure38%
• Chronic kidney disease35%

Hospitals where Elena A. Kossyreva works

Medicare's Facility Affiliation Data lists Elena A. Kossyreva 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.

• Kaiser Foundation Hospital and Rehab CenterVallejo, CA · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: not listed by Medicare · CCN 050073

Practice locations

Addresses where Elena A. Kossyreva is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Quality DrVacaville, CA 95688 (707) 624‑4000

Group practices

Medicare enrollment lists Elena A. Kossyreva as a member of this group (CMS data updated October 2, 2026).

• Permanente Medical Group Inc10,996 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in California →

Other emergency medicine doctors in Vacaville

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

• Taya L. Roberts, DO
• Jose C. Aguirre, MD
• Maricel Romelia B. Dela Cruz, DO
• Heidi E. Ladner, MD
• Amanda Hinton, MD
• Ingrid K. Hohimer McNicoll, MD
• Keerthi Gondy, MD
• Joseph Dane, MD

All emergency medicine doctors in Vacaville →

Other clinicians in Permanente Medical Group Inc

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

• Diana Greerty, MD
• Evelyn Mascarenas, CSW
• Omnia D. Awad, MD
• Amit Arora, MD
• Tam T. Do, DO
• Valerie R. Chavez-Flores, 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