James S. Gammie, MD

Medicare activity in 2024

Official CMS public-use data for James S. Gammie, 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. New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)85 services
2. Repair of mitral valve with artificial valve on heart-lung machine (33426)28 services
3. Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more (99215)26 services
4. Replacement of mitral valve on heart-lung machine (33430)22 services
5. Repair of tricuspid valve with ring insertion (33464)22 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%
• Ischemic heart disease61%
• Atrial fibrillation61%
• Heart failure53%
• Arthritis44%

Hospitals where James S. Gammie works

Medicare's Facility Affiliation Data lists James S. Gammie 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.

• The Johns Hopkins HospitalBaltimore, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210009
• University of MD St Joseph Medical CenterTowson, MD · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 210063

Practice locations

Addresses where James S. Gammie is enrolled with Medicare (CMS data updated October 2, 2026).

• 5255 Loughboro Rd NWWashington, DC 20016 (202) 370‑6565
• 5255 Loughboro Road NW, Sibley Memorial HospitalWashington, DC 20016 (202) 660‑6500
• 600 N Wolf StBaltimore, MD 21287
• 600 N Wolfe St, Blalock 266Baltimore, MD 21287 (410) 502‑4340
• 8600 Old Georgetown RdBethesda, MD 20814 (301) 896‑7610

Group practices

Medicare enrollment lists James S. Gammie as a member of these groups (CMS data updated October 2, 2026).

• Johns Hopkins University2,909 clinicians in the group
• Johns Hopkins University713 clinicians in the group

Specialties

• Cardiac Surgeryprimary
• General Surgeryalso

Find other Cardiac Surgery doctors in District of Columbia →

Other cardiac surgeons in Washington

Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.

• Alexander Nissen, MD
• Duke Cameron, MD
• Mehrdad Ghoreishi, MD
• Rachel E. Harrison, MD
• Marek Polomsky, MD
• Christian C. Shults, MD

All cardiac surgeons in Washington →

Other clinicians in Johns Hopkins University

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

• Andrea E. Kappler, NP
• Charles Lowenstein, MD
• Brittany L. Schwarz, MD
• Robert G. Weiss, MD
• Michael Goggins, MD
• Angeliki Filippatou, 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