Carolyn J. O'Connor, MD

Medicare activity in 2024

Official CMS public-use data for Carolyn J. O'Connor, 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. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)338 services
2. Advance care planning, first 30 minutes (99497)135 services
3. Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (G0439)128 services
4. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)113 services
5. Injection of drug or substance under skin or into muscle (96372)68 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 cholesterol75%
• High blood pressure70%
• Arthritis44%
• Osteoporosis27%
• Anxiety24%
• Ischemic heart disease23%

Hospitals where Carolyn J. O'Connor works

Medicare's Facility Affiliation Data lists Carolyn J. O'Connor 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.

• Saint Mary's HospitalWaterbury, CT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 070016

Practice locations

Addresses where Carolyn J. O'Connor is enrolled with Medicare (CMS data updated October 2, 2026).

• 56 Franklin StWaterbury, CT 06706 (203) 709‑6000

Group practices

Medicare enrollment lists Carolyn J. O'Connor as a member of this group (CMS data updated October 2, 2026).

• Trinity Health of New England Provider Network Organization Inc653 clinicians in the group

Specialties

• Internal Medicineprimary

Find other Internal Medicine doctors in Connecticut →

Other internal medicine doctors in Waterbury

Clinicians with the same Medicare primary specialty in Waterbury, CT — not a recommendation.

• Edmund P. Quinn, MD
• Fabiola A. Mieses Pun, MD
• Hashem Kalbouneh, MD
• Sudha Thiruvengadam, MD
• Edmund Caporaso, MD
• Philip A. Mongelluzzo, MD
• Andrew J. Donati, MD
• David J. Delucia, MD

All internal medicine doctors in Waterbury →

Other clinicians in Trinity Health of New England Provider Network Organization Inc

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

• Kelly M. Porter
• Prashant Grover, MD
• Amanda Loya
• Ronald Sharo, MD
• Sarah Rabbett, NP
• Kelsey R. McDonnell

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