Medical Condition
- Unit, Intensive Care
- Unit, Minimal Care
- Unit, Mobile Emergency
- Unit, Mobile Health
- Unit, Neoplastic Colony-Forming
- Unit, Pain Relief
- Unit, Replication
- Unit, Respiratory Care
- Unit, Self-Care
- Unit, SI
- Unit, Trauma
- United Arab Republic
- United Nations
- United States Agency for Health Care Policy and Research
- United States Agency for Healthcare Research and Quality
- United States Alcohol, Drug Abuse, and Mental Health Administration
- United States Centers for Disease Control
- United States Centers for Disease Control and Prevention
- United States Centers for Medicare and Medicaid Services
- United States Congress Office of Technology Assessment
- United States Department of Agriculture
- United States Department of Health
- United States Department of Health and Human Services
- United States Department of Health, Education and Welfare
- United States Department of Health, Education, and Welfare
- United States Department of Health, Human Services
- United States Department of Human Services
- United States Department of Veterans Affairs
- United States Dept. of Health and Human Services
- United States Environmental Protection Agency
- United States Federal Trade Commission
- United States Food and Drug Administration
- United States Food, Drug Administration
- United States Health Care Financing Administration
- United States Health Insurance Portability and Accountability Act
- United States Health Resources Administration
- United States Health Resources and Services Administration
- United States Health Services and Mental Health Administration
- United States Indian Health Service
- United States National Academy of Sciences
- United States National Center for Health Statistics
- United States National Health Planning Information Center
- United States National Institute of Mental Health
- United States National Institutes of Health
- United States National Library of Medicine
- United States Occupational Health Administration
- United States Occupational Safety Administration
- United States Occupational Safety and Health Administration
- United States Occupational Safety, Health Administration
- United States Office of Economic Opportunity
- United States Office of Research Integrity
- United States Office of Technology Assessment
- United States Office of the Assistant Secretary for Health Office of Research Integrity
- United States Public Health Service
- United States Social Security Administration
- United States Substance Abuse and Mental Health Services Administration
- United States Supreme Court
- United States Tax Equity and Fiscal Responsibility Act
- United States Veterans Administration
- Unithiol
- Unitiol
- Units, Burn
- Units, Cancer Care
- Units, Colony-Forming
- Units, Coronary Care
- Units, Emergency Mobile
- Units, Emergency Outpatient
- Units, Hematopoietic Colony-Forming
- Units, Hospital
- Units, Hospital Hemodialysis
- Units, Intensive Care
- Units, Minimal Care
- Units, Mobile Emergency
- Units, Mobile Health
- Units, Neoplastic Colony-Forming
- Units, Pain Relief
- Units, Replication
- Units, Respiratory Care
- Units, Self-Care
- Units, SI
- Units, Trauma
- Universal Coverage
- Universal Precaution
- Universal Precautions
- Universities
- University
- University Health Service
- University Health Services
- University Hospitals
- University Medical Center
- University Medical Centers
- Unknown Origin Fever
- Unknown Origin Fevers
- Unknown Primary Neoplasm
- Unknown Primary Neoplasm Metastasis
- Unknown Primary Neoplasms
- Unknown Primary Tumor
- Unknown Primary Tumors
- Unloading, Hindlimb
- Unloading, Skeletal
- Unit, Minimal Care