Siddhartha Y. Parker, MD

Medicare activity in 2024

Official CMS public-use data for Siddhartha Y. Parker, 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. Moderate sedation services provided by the same physician or other qualified health care professional performing a gastrointestinal endoscopic service that sedation supports, requiring the presence of an independent trained observer to assist in the monito (G0500)124 services
2. Removal of polyps or growths of large bowel using an endoscope with mechanical snare (45385)108 services
3. Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (43239)70 services
4. Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)46 services
5. Visit complexity inherent to evaluation and management associated with medical care services that serve as the continuing focal point for all needed health care services and/or with medical care services that are part of ongoing care related to a patient's (G2211)45 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 pressure63%
• High cholesterol59%
• Arthritis42%
• Depression28%
• Anxiety27%
• Ischemic heart disease24%

Hospitals where Siddhartha Y. Parker works

Medicare's Facility Affiliation Data lists Siddhartha Y. Parker 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.

• Mary Hitchcock Memorial HospitalLebanon, NH · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 300003
• New London HospitalNew London, NH · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 301304
• Northeastern Vermont Regional HospitalSaint Johnsbury, VT · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 471303
• Rutland Regional Medical CenterRutland, VT · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 470005
• Valley Regional HospitalClaremont, NH · Critical Access Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 301308

Practice locations

Addresses where Siddhartha Y. Parker is enrolled with Medicare (CMS data updated October 2, 2026).

• 1 Medical Ctr DrLebanon, NH 03756 (603) 650‑5000
• 100 Hitchcock WayManchester, NH 03104 (603) 695‑2500
• 273 Country RdNew London, NH 03257 (603) 526‑5215
• PO Box, Suite 810Hanover, NH 03755

Group practices

Medicare enrollment lists Siddhartha Y. Parker as a member of these groups (CMS data updated October 2, 2026).

• Dartmouth-Hitchcock Clinic1,472 clinicians in the group
• Mary Hitchcock Memorial Hospital1,280 clinicians in the group
• The New London Hospital Association Inc68 clinicians in the group

Specialties

• Gastroenterologyprimary

Find other Gastroenterology doctors in New Hampshire →

Other gastroenterologists in Lebanon

Clinicians with the same Medicare primary specialty in Lebanon, NH — not a recommendation.

• David A. Klibansky, MD
• Adnan Malik, MD
• Bethany Reutemann, MD
• Sarah M. Hyder, MD
• L C. Levy, MD
• Stuart R. Gordon, MD
• Shelby A. Sullivan, MD
• Prasanna V. Gulur, MD

All gastroenterologists in Lebanon →

Other clinicians in Dartmouth-Hitchcock Clinic

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

• Matthew O. Nichols, PA
• Sara S. Tannenbaum, MD
• Joerg Rathmann, MD
• Azaliah Tillinghast
• Katelyn Patrick, CNA
• David A. Klibansky, 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