Leonidas M. Pritsiolas, MD

Medicare activity in 2024

Official CMS public-use data for Leonidas M. Pritsiolas, 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)503 services
2. Emergency department visit with moderate level of medical decision making (99284)103 services
3. Critical care, first 30-74 minutes (99291)58 services
4. Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes (99223)37 services
5. Emergency department visit with low level of medical decision making (99283)21 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%
• Diabetes58%
• Ischemic heart disease51%
• Arthritis50%
• Heart failure41%

Hospitals where Leonidas M. Pritsiolas works

Medicare's Facility Affiliation Data lists Leonidas M. Pritsiolas 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.

• Clara Maass Medical CenterBelleville, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310009
• Cooperman Barnabas Medical CenterLivingston, NJ · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 310076

Practice locations

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

• 1 Clara Maass DrBelleville, NJ 07109 (973) 450‑2000
• 94 Old Short Hills RdLivingston, NJ 07039 (973) 322‑5000

Group practices

Medicare enrollment lists Leonidas M. Pritsiolas as a member of this group (CMS data updated October 2, 2026).

• RWJBH Emergency Medicine Associates, LLC848 clinicians in the group

Specialties

• Emergency Medicineprimary

Find other Emergency Medicine doctors in New Jersey →

Other emergency medicine doctors in Belleville

Clinicians with the same Medicare primary specialty in Belleville, NJ — not a recommendation.

• Cathy D. Chen, DO
• Patrick M. Davis, MD
• John A. Fontanetta, MD
• Neena Gupta, MD
• Joe E. Dib, MD
• Veer Patel, MD
• Noah Futterman, DO
• Nilesh V. Kansagra, MD

All emergency medicine doctors in Belleville →

Other clinicians in RWJBH Emergency Medicine Associates, LLC

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

• George Zhang, MD
• Melissa I. Locke, DO
• Alyssa M. Veth, NP
• Karanvir Kals, DO
• Janine Grayson, MD
• Sadia Ali, 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