Janet Cevallos-Brennan, MD

Medicare activity in 2024

Official CMS public-use data for Janet Cevallos-Brennan, 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. Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes (99232)326 services
2. Hospital discharge day management, more than 30 minutes (99239)63 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%
• Arthritis64%
• Ischemic heart disease64%
• Chronic kidney disease58%
• Diabetes56%

Hospitals where Janet Cevallos-Brennan works

Medicare's Facility Affiliation Data lists Janet Cevallos-Brennan 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.

• Good Samaritan Hospital Medical CenterWest Islip, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330286

Practice locations

Addresses where Janet Cevallos-Brennan is enrolled with Medicare (CMS data updated October 2, 2026).

• 1000 Montauk HwyWest Islip, NY 11795 (631) 376‑3000

Group practices

Medicare enrollment lists Janet Cevallos-Brennan as a member of this group (CMS data updated October 2, 2026).

• Southwest Suffolk Medical PC199 clinicians in the group

Specialties

• Hospitalistprimary

Find other Hospitalist doctors in New York →

Other hospitalists in West Islip

Clinicians with the same Medicare primary specialty in West Islip, NY — not a recommendation.

• Virginie Auguste, MD
• Eleni Dilos, MD
• Rajat Virmani, MD
• Oluremi Oparah, MD
• Tamara I. Shashiashvili, DO
• Amit Goel, MD
• Ryan Narain, MD
• Christopher M. Brennan, MD

All hospitalists in West Islip →

Other clinicians in Southwest Suffolk Medical PC

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

• Liying Chen, MD
• Atif Aziz, MD
• Alicia Chionchio, MD
• David Zhang, MD
• Melissa Rivas, MD
• Mark Bertsch, NP

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