2.1 Cost Sharing

Cost Sharing in Health Insurance

Quick Answer: Cost sharing is the portion of covered medical expenses that an insured pays out of pocket — deductibles, coinsurance, copayments, and amounts up to the out-of-pocket maximum — after the insurer pays its share. It is the primary mechanism insurers use to control moral hazard and keep premiums affordable.

Cost sharing shifts a measured portion of claim cost from the insurer to the insured. By requiring the policyholder to pay something at the point of service, the insurer reduces both over-utilization (moral hazard) and the premium needed to fund claims. Every Accident & Health (A&H) producer exam expects you to distinguish the four cost-sharing mechanisms and to apply the current statutory limits.

Deductibles

A deductible is a fixed dollar amount the insured must pay for covered services before the insurer begins to pay. Deductibles may be stated per benefit period (often calendar year), per cause of loss, or per person.

• Per cause of loss (common in basic medical): each illness or injury triggers its own deductible.
• Calendar-year (common in major medical): one deductible resets each January 1.
• Family deductible: can be aggregate (one family total must be met before anyone is paid) or embedded (each individual has their own deductible, and once any individual meets it, that person's claims are paid even if the family total is not met).

Embedded vs aggregate is a frequent exam topic. With an embedded deductible, once one family member satisfies the individual deductible, that member's covered claims are paid — the family does not have to wait until the full family aggregate is reached. Most modern family plans use embedded deductibles, and the ACA requires embedded individual deductibles within family coverage for essential health benefits so that no single family member faces the full family OOP exposure.

A corridor deductible is a separate deductible that applies between two layers of coverage — for example, between basic medical (which pays up to a limit) and major medical (which kicks in after basic is exhausted). The corridor bridges the gap so the insured pays a deductible before major medical begins. A franchise deductible (also called a waiver-of-deductible) waives the deductible entirely once a specified loss amount is reached, so larger claims pay without any deductible being applied.

Coinsurance

Coinsurance is a percentage split of covered charges after the deductible is met. A common major medical design is 80/20: the insurer pays 80%, the insured pays 20%. The stop-loss provision caps the insured's coinsurance share (often at $5,000 or $10,000), after which the insurer pays 100% of covered charges for the rest of the benefit period.

Copayments

A copayment (copay) is a fixed dollar amount paid at the point of service — most often for office visits, emergency room visits, or prescriptions (e.g., $25 primary care, $75 ER). Copays typically apply to managed care plans (HMO/PPO) and are separate from deductible/coinsurance mechanics. Preventive care copays are often $0 under ACA-compliant plans because the ACA requires first-dollar coverage (no cost sharing) for recommended preventive services.

A key exam distinction: copays are fixed dollar amounts, coinsurance is a percentage. A plan can have both — for example, a $30 copay for an office visit and 20% coinsurance for a surgery. Whether a copay counts toward the deductible and OOP maximum depends on the plan design; in ACA-compliant major medical plans, copays generally count toward the OOP maximum.

Common deductible waiver provisions can waive the deductible for specific services. For example, many plans waive the deductible for the first few office visits or for preventive care, encouraging early treatment that reduces downstream cost.

Out-of-Pocket Maximums

The out-of-pocket (OOP) maximum is the annual cap on what the insured pays in cost sharing for in-network essential health benefits. Once the OOP max is reached, the plan pays 100% of covered in-network charges for the rest of the year.

• 2026 ACA OOP maximum (CMS): $10,600 self-only and $21,200 family. All non-grandfathered group and individual major medical plans must cap in-network cost sharing at or below these amounts.
• 2026 HDHP OOP maximum (IRS): $8,500 self-only and $17,000 family — lower than the ACA cap because HDHPs paired with HSAs must satisfy both the HDHP and ACA limits.

Cost-Sharing Comparison

Common Exclusions

Typical A&H exclusions (which are not cost sharing but reduce benefits) include: cosmetic surgery, experimental/investigational treatments, self-inflicted injuries, war-related injuries, and vision/dental (unless separately covered). Exclusions differ from cost sharing — exclusions remove coverage entirely; cost sharing only shifts part of a covered expense.

How Cost Sharing Controls Moral Hazard

Moral hazard is the tendency to over-consume care when someone else pays. Cost sharing curbs moral hazard by making the insured a price-sensitive participant at the point of service. Higher deductibles and coinsurance lower premiums but shift more risk to the insured; lower cost sharing raises premiums. The producer must balance affordability against protection when recommending a plan.

The law of large numbers lets an insurer predict aggregate claims, but cost sharing keeps per-claim behavior in check. Without cost sharing, an insured has no financial reason to avoid unnecessary services, and utilization (and premiums) would rise. Cost sharing also supports adverse selection control: a plan with very low cost sharing attracts heavier users, while a plan with meaningful cost sharing attracts more balanced risk — one reason insurers tier premiums by plan design.

When you describe a plan to a client, walk through the full stack in order: deductible first, then coinsurance up to the stop-loss, then the OOP maximum caps everything. A client who understands this order can compare metal tiers and HDHP options intelligently instead of focusing only on the premium.