Gregory J. Gagnon, MD

Medicare activity in 2024

Official CMS public-use data for Gregory J. Gagnon, 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. Intensity modulated treatment delivery, single or multiple fields/arcs,via narrow spatially and temporally modulated beams, binary, dynamic mlc, per treatment session (G6015)2,335 services
2. Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy (G6002)2,050 services
3. Calculation of radiation therapy dose (77300)1,752 services
4. Continuing radiation therapy consultation per week (77336)688 services
5. Design and construction of complex radiation treatment device (77334)630 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%
• Cancer (breast, colorectal, lung, prostate, endometrial or leukemia/lymphoma)75%
• Arthritis42%
• Ischemic heart disease38%
• Diabetes33%

Hospitals where Gregory J. Gagnon works

Medicare's Facility Affiliation Data lists Gregory J. Gagnon 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.

• Frederick Health HospitalFrederick, MD · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 210005

Practice locations

Addresses where Gregory J. Gagnon is enrolled with Medicare (CMS data updated October 2, 2026).

• 1562 Opossumtown PikeFrederick, MD 21702 (240) 566‑4500
• 1564 Opossumtown PikeFrederick, MD 21702

Group practices

Medicare enrollment lists Gregory J. Gagnon as a member of these groups (CMS data updated October 2, 2026).

• Frederick Health Hospital Inc127 clinicians in the group
• Gagnon Oncology LLC4 clinicians in the group

Specialties

• Radiation Oncologyprimary

Find other Radiation Oncology doctors in Maryland →

Other radiation oncologists in Maryland

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

• Kruti N. Patel, MD
• Manoj Jain, MD
• Meredith H. Wernick, MD
• Jason Molitoris, MD
• Sylwester Dziuba, MD
• Neha Bhooshan, MD
• Akshar N. Patel, MD
• William K. Woods, MD

All radiation oncologists in Maryland →

Other clinicians in Frederick Health Hospital Inc

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

• Moe Zan, MD
• Kathryn T. Shoemaker, PT
• Florin Rusu, MD
• Richard G. Yeron, MD
• Elizabeth M. Kotroba
• Hitesh V. Patel, 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