Health insurance cost drivers include medical and drug price inflation, how much care is used, chronic conditions, group demographics, geography, and plan design. Recognizing them helps employers anticipate renewals and choose where to focus cost controls.
Specialty drugs are high-cost medications for complex or chronic conditions (like cancer, autoimmune disease, or MS) that often need special handling or administration. They carry the highest formulary tier and are a leading driver of plan costs.
Mainly because health care itself is expensive. Premiums reflect the underlying cost of claims, and those costs are pushed up by provider and insurer consolidation, the rising prevalence of chronic disease, expensive new drugs and technology, and the fact that third-party payment mutes normal price competition.
Costs are rising sharply in 2026. Employer health plan costs are projected up about 6.5 to 9.5% depending on the survey (Mercer about 6.5%, Aon about 9.5%), among the largest increases in roughly 15 years. ACA Marketplace premiums are also jumping, with insurers proposing a median increase near 18%, and the scheduled end of the enhanced premium subsidies would more than double what many subsidized enrollees pay.
Premiums reflect the expected cost of claims, not whether your specific benefits changed. They rise each year with medical inflation, drug prices, and your group’s own claims experience and changing demographics, because the carrier reprices annually to cover expected costs.