- HCA Houston Healthcare Clear Lake
- HCA Houston Healthcare Kingwood
- HCA Houston Healthcare North Cypress
- HCA John Randolph
- HCA Johnston Willis Hospital
- HCA Lake Monroe Hospital
- HCA South Bay Hospital
- HCA-North Austin Surgery Center
- HCR ManorCare
- HDI Inc.
- HDR Engineering, Inc
- HDS Marketing
- HDS Marketing Inc.
- HDS Services
- Head Start of Rockland
- Healing Tree Economic Development Inc.
- Health Care Central Georgia, Inc.
- Health Care for the Homeless
- Health Care Software, Inc.
- Health Careers Opportunity Program
- Health Central Hospital
- Health Council of East Central Florida
- Health Dept., Town of Wallinford
- Health Dimensions Consulting Group
- Health Dimensions Group
- Health First Hospitals
- Health Forum
- Health Improvement Partnership
- Health Net
- Health Partners of Western Ohio
- Health Plan Council of Northeast Florida Inc.
- Health Quip, Inc.
- Health Research Inc.
- Health Resources and Services Administration Bureau of Health Administration
- Health Resources and Services Administration, Region V
- Health Resources Inc.
- Health Serve Medical Center
- Health South Central Georgia Rehab Hospital
- HealthAlliance Hospital Mary's Avenue Campus
- HealthAlliance of the Hudson Valley
- Healthcare Association of Hawaii
- Healthcare Association of New York State
- Healthcare Communications Group
- Healthcare Convention and Exhibitors Association
- Healthcare Employment Screening
- Healthcare Environments Lifestyle Products, LLC
- Healthcare First Northeast
- Healthcare Information and Management Systems Society
- Healthcare Sharing Initiative, Inc.
- Healthcare Therapy Services