The 2019 Milliman Medical Index, which measures healthcare costs for individuals and families receiving coverage from an employer-sponsored preferred provider plan, found that health care costs have reached $28,386 for a family, an increase of 3.8% from the year prior. Health care costs for the average American adult are at $6,348. Milliman looks at five components of health care costs, including inpatient and outpatient care, pharmacy, professional, and other services.