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💳 '''Cost sharing''' is the allocation of covered medical or loss-related expenses between the [[Definition:Insurance carrier | insurer]] and the [[Definition:Policyholder | policyholder]], accomplished through mechanisms such as [[Definition:Deductible | deductibles]], [[Definition:Copayment | copayments]], and [[Definition:Coinsurance | coinsurance]]. Most visible in [[Definition:Health insurance | health insurance]], cost sharing establishes how much of a [[Definition:Claim | claim's]] cost the insured must pay out of pocket before the carrier's obligation begins or alongside it. The design of cost-sharing structures is one of the most consequential decisions in product development because it directly influences [[Definition:Premium | premium]] levels, [[Definition:Utilization management | utilization behavior]], and the overall [[Definition:Loss ratio | loss ratio]] of a book of business.

⚙️ In a typical health plan, cost sharing works through a layered architecture. The policyholder first satisfies an annual [[Definition:Deductible | deductible]] — paying the full allowed amount for covered services until the threshold is met. Once the deductible is satisfied, [[Definition:Coinsurance | coinsurance]] splits subsequent costs at a defined ratio, such as 80/20, between the insurer and the insured. Fixed-dollar [[Definition:Copayment | copayments]] may apply to specific services like office visits or prescriptions, sometimes independent of the deductible. An [[Definition:Out-of-pocket maximum | out-of-pocket maximum]] caps the insured's total annual exposure, after which the plan pays 100 percent of covered costs. These parameters interact to shape the plan's actuarial value — the share of total expected costs borne by the insurer — which under the [[Definition:Affordable Care Act (ACA) | Affordable Care Act]] determines the plan's metal tier.

🎯 Getting cost sharing right matters far beyond premium arithmetic. Excessive cost sharing can discourage people from seeking necessary care, leading to worse health outcomes and ultimately higher [[Definition:Claim severity | claim severity]] when untreated conditions escalate. Conversely, too little cost sharing can remove the incentive for insured individuals to be cost-conscious consumers, inflating [[Definition:Utilization rate | utilization]] and driving up the carrier's [[Definition:Incurred losses | incurred losses]]. Regulators impose guardrails — the ACA mandates maximum [[Definition:Out-of-pocket maximum | out-of-pocket limits]] and minimum [[Definition:Actuarial value | actuarial values]] — to balance affordability with adequate coverage. For insurers and [[Definition:Insurtech | insurtech]] plan designers alike, modeling cost-sharing scenarios with precision is essential to crafting products that are competitive, compliant, and financially sustainable.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Deductible]]
* [[Definition:Coinsurance]]
* [[Definition:Copayment]]
* [[Definition:Out-of-pocket maximum]]
* [[Definition:Actuarial value]]
* [[Definition:Cost-sharing reduction (CSR)]]
{{Div col end}}

Definition:Cost sharing - Revision history

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