Keri A. Herzog, MD

Medicare activity in 2024

Official CMS public-use data for Keri A. Herzog, 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)103 services
2. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)71 services
3. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)50 services
4. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)38 services
5. Biopsy of large bowel using a flexible endoscope (45380)37 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 pressure72%
• Arthritis47%
• Anxiety31%
• Depression30%
• Osteoporosis28%

Hospitals where Keri A. Herzog works

Medicare's Facility Affiliation Data lists Keri A. Herzog 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.

• Bridgeport HospitalBridgeport, CT · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 070010
• Lawrence & Memorial HospitalNew London, CT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 070007
• Yale-New Haven HospitalNew Haven, CT · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 070022

Practice locations

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

• 300 Seaside AveMilford, CT 06460 (203) 876‑4000
• 5 Pequot Park RdWestbrook, CT 06498
• 687 Main StBranford, CT 06405 (203) 481‑0315
• 849 Boston Post Rd, Suite 205Milford, CT 06460 (203) 481‑0315

Group practices

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

• Digestive Disease Associates LLC8 clinicians in the group

Specialties

• Gastroenterologyprimary
• Internal Medicinealso

Find other Gastroenterology doctors in Connecticut →

Other gastroenterologists in Connecticut

Clinicians with the same Medicare primary specialty in Connecticut — not a recommendation.

• Housein M. Wazaz, MD
• Daniel P. Stupak, MD
• Russell Parvin, MD
• David N. Assis, MD
• Gordon S. Latzman, MD
• Neil D. Parikh, MD
• Steven Beckoff, MD
• Andrew Bedford, MD

All gastroenterologists in Connecticut →

Other clinicians in Digestive Disease Associates LLC

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

• Nadeen N. Hussain, MD
• Daniel J. Zanchetti, MD
• Michael P. Dorfman, MD
• Kenneth Barshop, MD
• Christopher Illick, 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