Leo J. Gosselin Jr., MD

Medicare activity in 2024

Official CMS public-use data for Leo J. Gosselin Jr., 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 low level od decision making, if using time, 20 minutes or more (99213)84 services
2. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)52 services
3. New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more (99203)38 services
4. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)38 services
5. Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more (99214)35 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%
• Arthritis45%
• Diabetes30%
• Chronic kidney disease25%
• Depression24%

Hospitals where Leo J. Gosselin Jr. works

Medicare's Facility Affiliation Data lists Leo J. Gosselin Jr. 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.

• Lewis County General HospitalLowville, NY · Critical Access Hospital · Emergency services: listed by Medicare · CCN 331317
• Samaritan Medical CenterWatertown, NY · Acute Care Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 330157

Practice locations

Addresses where Leo J. Gosselin Jr. is enrolled with Medicare (CMS data updated October 2, 2026).

• 629 Washington StWatertown, NY 13601 (315) 755‑3650
• 826 Washington St, Suite 106Watertown, NY 13601 (315) 782‑1505

Group practices

Medicare enrollment lists Leo J. Gosselin Jr. as a member of this group (CMS data updated October 2, 2026).

• Samaritan Medical Practice PC29 clinicians in the group

Specialties

• General Surgeryprimary

Find other General Surgery doctors in New York →

Other general surgeons in Watertown

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

• Lynsey Daniels, MD
• Benjamin Sigmond, MD
• Daniel Bryden, DO
• Michael B. Peyser, MD
• James Stillerman, MD
• Eduardo B. Barayuga, MD

All general surgeons in Watertown →

Other clinicians in Samaritan Medical Practice PC

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

• Lynsey Daniels, MD
• Anna E. Garrabrant
• David J. Leu, MD
• Kyle J. Klahs
• Matthew J. Kinnard, MD
• Carl A. Petitto, OT

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