Illinois courts require parents to provide health insurance for children as part of child support orders, with premiums capped at 5% of the providing parent's gross income under 750 ILCS 5/505.2. The state uses the Income Shares Model to calculate support, and health insurance costs are allocated proportionally between parents based on their respective net incomes. For example, if a parent earns 60% of the combined parental income and adding a child to their employer health plan costs $200 per month, that parent bears $120 of the premium cost while the other parent bears $80. Unreimbursed medical expenses exceeding $250 per child per year are divided separately on top of the basic support obligation.
| Key Facts | Details |
|---|---|
| Filing Fee | $250-$388 (varies by county; Cook County $388) |
| Waiting Period | None for dissolution; 90-day residency required |
| Residency Requirement | 90 days for at least one spouse |
| Grounds | No-fault only (irreconcilable differences) |
| Property Division | Equitable distribution |
| Health Insurance Cap | 5% of providing parent's gross income |
| Unreimbursed Medical Threshold | $250 per child per year |
How Illinois Law Requires Health Insurance in Child Support Orders
Illinois mandates that one or both parents provide health insurance coverage for children when available at reasonable cost, defined as no more than 5% of the providing parent's gross income under 750 ILCS 5/505.2. Courts order the parent with access to employer-sponsored or group health insurance to enroll the child, and the premium cost attributable to the child is then allocated between both parents in proportion to their respective incomes. If neither parent has access to affordable coverage, the court may order cash medical support payments instead.
The Illinois Marriage and Dissolution of Marriage Act (IMDMA) specifically addresses health insurance child support Illinois obligations in Section 505.2. When a parent receives child support and also pays for the child's health insurance, the premium cost is factored into the overall support calculation. Parents with net income below 133% of federal poverty guidelines or whose child is covered by Medicaid based on that parent's income cannot be ordered to contribute toward private coverage unless it is available at no cost to that parent.
Courts retain jurisdiction to modify health insurance orders whenever coverage becomes available or affordable circumstances change. The statute explicitly prohibits employers from removing a child from coverage unless the employee is no longer covered under the plan, the support order is terminated, or the child enrolls in comparable coverage with no lapse.
Understanding the Income Shares Model for Medical Support
Illinois calculates child support using the Income Shares Model, which determines each parent's proportional share of combined net income and applies that percentage to both basic support and additional costs including health insurance premiums. The Illinois Department of Healthcare and Family Services publishes the Schedule of Basic Child Support Obligations, most recently updated March 5, 2025, which courts reference to determine base support amounts before adding healthcare and childcare expenses.
The calculation process begins with determining each parent's monthly net income by subtracting federal and state income taxes, Social Security contributions, Medicare taxes, mandatory retirement contributions, and existing child or spousal support obligations from gross income. Health insurance premiums paid for the child are subtracted from the paying parent's net income before calculating the basic support obligation under 750 ILCS 5/505.
For shared parenting situations where each parent has the child for at least 146 overnights per year, Illinois applies a different calculation formula under 750 ILCS 5/505(a)(3.8). The adjusted formula accounts for each parent's direct contributions during their parenting time while maintaining proportional allocation of healthcare costs.
What Counts as Reasonable Cost for Health Insurance
Illinois defines reasonable cost for health insurance coverage as no more than 5% of the providing parent's gross income, creating a clear standard courts apply when ordering medical support. If adding a child to a parent's employer health plan would cost $300 monthly but 5% of that parent's gross monthly income equals only $250, the court cannot order that parent to provide coverage exceeding the cap without modification.
The reasonable cost determination considers only the incremental cost attributable to the child, not the full family premium. Many employers offer coverage tiers including employee-only, employee-plus-spouse, employee-plus-children, and family coverage. Courts calculate the difference between the employee-only premium and the tier covering the child to determine the actual cost of the child's coverage.
When private insurance exceeds reasonable cost limits or is unavailable, courts may order cash medical support as an alternative. Cash medical support consists of payments toward the cost of health insurance provided by a public entity, another person through employment, or for medical costs not covered by insurance.
How Courts Allocate Unreimbursed Medical Expenses
Illinois child support orders allocate unreimbursed medical expenses between parents in proportion to their respective shares of combined net income, with expenses exceeding $250 per child per year divided separately from the basic support obligation. The $250 threshold exists because the Schedule of Basic Child Support Obligations already includes an allowance for ordinary out-of-pocket medical expenses at that amount.
Unreimbursed medical expenses include copays, deductibles, prescription medication costs, dental work, orthodontia, vision care, mental health services, and any other medical costs not covered by insurance. Courts typically order the parent who incurs the expense to submit documentation to the other parent within 30-60 days, with the other parent required to reimburse their proportional share within a specified timeframe.
Orders commonly specify a 50/50 split for unreimbursed expenses, though courts may order different allocations such as 70/30, 60/40, or 55/45 based on income disparity or other equitable factors. In some cases, courts order one parent to bear 100% of certain extraordinary medical expenses, particularly when those expenses arise from decisions made unilaterally by one parent.
Qualified Medical Child Support Orders (QMCSO) in Illinois
A Qualified Medical Child Support Order (QMCSO) is a court order or administrative notice that directs a group health plan governed by ERISA to provide coverage to a child of a plan participant, and Illinois courts routinely issue these orders as part of divorce and child support proceedings. Under federal law (ERISA Section 609), employer-sponsored health plans must honor properly qualified medical child support orders by enrolling the child regardless of open enrollment periods or the employee-parent's enrollment decisions.
The determination of whether an order qualifies rests with the health plan administrator, who must review the order using written procedures and make a determination within a reasonable time. For an order to qualify, it must clearly identify the child, the plan, the type of coverage required, and the period during which coverage applies. The order cannot require the plan to provide benefits it does not already offer or require payment of benefits already provided to another beneficiary.
Illinois child support enforcement agencies may use the National Medical Support Notice (NMSN), a standardized federal form that automatically qualifies as a QMCSO if properly completed. The NMSN streamlines the process by providing plan administrators with all required information in a consistent format, reducing disputes and delays in securing coverage for children.
Enforcement Options When a Parent Fails to Provide Insurance
Illinois provides multiple enforcement mechanisms when a parent ordered to provide health insurance child support Illinois coverage fails to comply, including income withholding, contempt proceedings, and direct enrollment orders. Courts may find a non-compliant parent in contempt under 750 ILCS 5/505(d), which can result in fines, jail time, or both until compliance occurs.
The Illinois Department of Healthcare and Family Services (HFS) administers the state's child support enforcement program and can take administrative action to enforce medical support orders. HFS can issue income withholding notices directly to employers, intercept tax refunds, suspend driver's licenses and professional licenses, and report delinquent obligors to credit bureaus.
When a parent fails to maintain ordered coverage, the custodial parent may obtain coverage independently and seek reimbursement from the non-compliant parent plus any additional costs incurred. Courts may modify support orders to include cash medical support if the originally ordered coverage becomes unavailable or unaffordable.
Modifying Health Insurance Provisions in Child Support Orders
Illinois courts modify health insurance provisions in child support orders when there is a substantial change in circumstances, including changes in employment, insurance availability, premium costs, or the child's medical needs. Under 750 ILCS 5/510, either parent may petition for modification at any time circumstances warrant review.
Common grounds for modification include job loss or change affecting insurance availability, significant premium increases exceeding the 5% reasonable cost cap, a child developing medical conditions requiring different coverage, or one parent gaining access to more affordable group coverage. Courts consider the best interests of the child and the parents' financial circumstances when evaluating modification requests.
The modification process requires filing a petition with the circuit court that issued the original order, paying filing fees ranging from $250 to $388 depending on county, and demonstrating the change in circumstances. Until the court enters a modified order, the existing order remains in full effect and both parties must continue compliance.
Special Considerations for High-Conflict Cases
High-conflict divorce cases often involve disputes over health insurance selection, provider choices, and allocation of extraordinary medical expenses, requiring specific order provisions to minimize future litigation. Illinois courts may designate one parent as the decision-maker for non-emergency medical treatment while requiring both parents to share relevant medical information under 750 ILCS 5/602.5.
Orders in high-conflict cases often include detailed provisions specifying which parent selects insurance coverage, notification requirements for medical appointments and treatment decisions, documentation requirements for reimbursement requests, and dispute resolution procedures before either parent may seek court intervention. Some orders require mediation of medical expense disputes before filing motions.
When parents cannot agree on extraordinary medical treatment such as orthodontia, elective procedures, or ongoing therapy, courts may reserve jurisdiction to allocate those specific costs. Orders may distinguish between ordinary unreimbursed expenses divided automatically and extraordinary expenses requiring prior agreement or court approval.
How Health Insurance Affects Overall Support Calculations
Health insurance premiums directly reduce the paying parent's net income before calculating basic support obligations, while the cost is simultaneously allocated proportionally between both parents as an additional expense on top of basic support. This dual treatment ensures the parent providing coverage receives credit for premium payments without shifting the entire burden onto one parent.
The Illinois child support worksheet requires parents to report the monthly premium cost attributable to the child, which is then subtracted from the providing parent's net income and added to the combined additional expenses. The worksheet calculates each parent's percentage share of combined income and applies that percentage to determine their contribution to healthcare costs.
For example, if Parent A earns $6,000 monthly net income and Parent B earns $4,000 monthly net income, Parent A has 60% income share and Parent B has 40% income share. If Parent A pays $300 monthly for the child's health insurance, that $300 is subtracted from Parent A's income for basic support calculation, but the $300 is also allocated 60/40 between parents as an additional expense, resulting in Parent A bearing $180 and Parent B bearing $120 of the cost.
Filing for Child Support with Health Insurance Provisions
Filing for child support with health insurance provisions in Illinois requires completing specific forms addressing medical support, insurance availability, and cost allocation. The petition must include information about each parent's access to health insurance, current coverage for the child if any, premium costs, and any special medical needs of the child.
Filing fees for child support petitions range from $210 to $388 depending on the county, with Cook County charging the highest fee at $388 and DuPage County charging $348 as of early 2026. Parents unable to afford filing fees may request a fee waiver under Illinois Supreme Court Rule 298 if their household income falls at or below 125% of federal poverty guidelines (approximately $18,500 for a single person in 2026).
Required documents include proof of income such as pay stubs, tax returns, and W-2 forms; proof of health insurance availability and cost; the child's current insurance card and coverage details; and documentation of any unreimbursed medical expenses. Parents should gather records of medical expenses from the past 12-24 months to establish baseline costs for allocation.