Surianarayanan Karthikeyan, MD

Medicare activity in 2024

Official CMS public-use data for Surianarayanan Karthikeyan, 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. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)72 services
2. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)51 services
3. Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)35 services
4. Biopsy of large bowel using a flexible endoscope (45380)26 services
5. Diagnostic exam of large bowel using a flexible endoscope (45378)17 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%
• Heart failure41%
• Chronic kidney disease37%
• Diabetes36%

Hospitals where Surianarayanan Karthikeyan works

Medicare's Facility Affiliation Data lists Surianarayanan Karthikeyan 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.

• Oswego HospitalOswego, NY · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 330218

Practice locations

Addresses where Surianarayanan Karthikeyan is enrolled with Medicare (CMS data updated October 2, 2026).

• 105 County Route 45a, Suite 100Oswego, NY 13126 (315) 342‑6771

Group practices

Medicare enrollment lists Surianarayanan Karthikeyan as a member of this group (CMS data updated October 2, 2026).

• Physician Care PC74 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in New York →

Other gastroenterologists in Oswego

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

• Mohammad F. Ali, MD
• Rayees Nizam, MD
• John H. Sun, DO
• Ajoy K. Roy, MD

All gastroenterologists in Oswego →

Other clinicians in Physician Care PC

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

• Kiranya E. Arnold, MD
• Jesse T. Ryan, MD
• Mark A. Humphrey, DO
• Meaghan Primm, MD
• Ruth M. Guzman
• Ryan M. Walker, 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