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Living with the Order

Open Enrollment After Separation: Which Health Plan Covers Your Child, and When You Can Change It

Learn which parent's health plan can cover your child after separation, when open enrollment starts, and how to avoid a coverage gap.

Best for the Children Editorial·8 min read·October 20, 2026

The benefits email shows up at work, or a Marketplace reminder lands in your inbox, and you realize you don't know for sure whose plan your child is on this year. Maybe your order says one thing and the insurance card in the backpack says another. Here is the short version. Your child needs one clear plan, and your custody order or settlement usually decides which parent provides it. Open enrollment, which starts November 1, is the main yearly chance to change plans. Medicaid and CHIP are open all year. The rest of this article walks you through the details.

The short answer: who covers your child, and when you can change it

A child doesn't need two plans, and two plans can make things harder. What your child needs is one plan that both parents know about and understand, with no gaps in coverage.

Who provides it is usually set by the court order or the agreement you signed. There's no single national rule saying the mother covers the child or the father does. Each state's child support rules handle this differently, and many families work it out themselves in a settlement. Start with your paperwork.

When you can change it depends on the type of coverage:

  • Marketplace plans (HealthCare.gov or your state's exchange): open enrollment is the yearly window, and it starts November 1.
  • Job-based plans: each employer sets its own enrollment season, often in the fall. Watch for HR emails.
  • Medicaid and CHIP: you can apply for your child any time. There is no enrollment window.

Many parents assume divorce lets them change plans whenever they want. It doesn't. A divorce or legal separation opens a special enrollment window only if it causes someone to lose health coverage. Losing coverage is what opens the door. The divorce by itself doesn't.

Children notice more than we think. What they need from this process is simple: when they're sick or hurt, the doctor visit goes smoothly and nobody argues in the waiting room about whose card to use.

Start with your order or agreement

Before you compare plans, get out your decree, parenting plan or settlement and look for the health insurance section. It may say:

  • which parent carries the child's insurance
  • how premiums are split, or whether they're counted in child support
  • how uncovered costs like copays, deductibles, braces and therapy are divided
  • what happens if the covering parent loses their job

If the order requires a parent to cover the child through work, there's usually a formal step that goes with it. A court or child support agency can issue a medical support order (sometimes called a QMCSO, or sent as a National Medical Support Notice). In general, employer group plans must honor a properly completed one. This means the child can be added even if the parent with the plan is slow to do it. The rules depend on the plan type and the paperwork, so the plan administrator or a family lawyer is the right person to confirm how it applies to you.

Don't drop the child's current coverage until the new plan has actually started. A gap of even a few weeks can mean a large bill from one urgent care visit. Choosing to drop coverage generally does not open a special enrollment window, so it can leave you stuck.

Your options for the child

Most families use one of these four.

1. A parent's job-based plan. This is often the simplest choice when one parent has good coverage through work. The child doesn't have to live with that parent full-time to be on the plan. Job-based plans let a child stay on a parent's plan until age 26, even if the child doesn't live with that parent or isn't claimed as a tax dependent.

2. A Marketplace plan. If neither parent has affordable coverage through work, the Marketplace is the next place to look. On Marketplace plans, a child can usually stay covered through December 31 of the year they turn 26, or longer if your state allows it. One point matters for separated parents: you must include the child on your Marketplace application if you plan to claim the child as a tax dependent. Which parent claims the child can change what the plan costs, so check with a tax preparer before you both apply.

3. Medicaid or CHIP. Separation often means one household is living on one income, so many families qualify who never did before. Eligibility depends on the state. In most states, children up to age 19 in families earning up to about $80,000 a year for a family of four may qualify, and some states set the limit higher. You can apply any time of year. The free hotline is 1-877-KIDS-NOW (1-877-543-7669).

4. COBRA. If a parent loses coverage because they were on the other parent's work plan, COBRA lets them and the children keep that same group coverage for a while. The Department of Labor lists divorce as a qualifying event. It's expensive, though. You can be charged up to 102% of the plan's full cost, because the employer no longer pays its share. COBRA can work well as a bridge while you set up something more affordable.

Adult children: if your child is in college or just starting out, both job-based and Marketplace plans can keep them covered into their mid-20s, as described above. Put this in your agreement too. It's easy to forget until it causes a dispute.

Open enrollment dates and what to do if you miss them

The start date is November 1, the day after Halloween. From then on, you can apply for 2027 coverage.

The end date is less clear this year. HealthCare.gov's dates page still lists January 15 as the end of open enrollment, with December 15 as the last day to enroll for coverage starting January 1. Several guides report that a federal rule change shortens the HealthCare.gov window to November 1 through December 15 for 2027 coverage. You don't need to work out which is right. Plan to finish by December 15. That date works either way and gets your child covered from January 1. Then check HealthCare.gov for the final deadline.

If your state runs its own exchange, its dates may be different. Check your state's site.

Thanksgiving falls on November 26 this year. Between travel, the holiday handoff and getting ready for December, it's easy to lose track of a December 15 deadline. If you can, get it done before Thanksgiving.

If you miss the window, you may still qualify for a special enrollment period:

  • Most qualifying events count if they happened in the past 60 days or are expected in the next 60.
  • Losing Medicaid or CHIP gives you 90 days.
  • Losing job-based coverage counts, including coverage you had through a family member, which covers a parent or child who was on the ex's plan.
  • A birth, adoption or foster placement opens a window, and coverage can start on the date of the event.
  • Divorce counts only if it causes a loss of coverage. Some state-run exchanges can grant a window when a divorce ends someone's status as a dependent, even without a coverage loss. Rules differ by state, so check your state exchange.

Medicaid and CHIP have no deadline at all.

Two-home practical tips

From what children tell us, getting sick at one parent's house and not being able to see the usual doctor feels like one more sign that they live in two separate worlds. Families can take care of this ahead of time.

  • Both homes need the insurance card. Each parent should have a physical card or a photo of the front and back. Your child shouldn't have to wait while the adults text each other for a member ID.
  • Both parents should know the in-network doctors, the nearest in-network urgent care and the pharmacy. If you live in different towns, check that there's an in-network option near each home.
  • Decide who gets the paperwork. Explanation-of-benefits statements and bills usually go to the person who holds the plan. Agree on how and how quickly they're shared with the other parent.
  • Be clear about who pays the premium and whether it's already counted in child support.
  • Be clear about out-of-pocket costs: copays, deductibles, prescriptions, glasses, therapy. Follow the split in your order. If your order doesn't cover it, write down an agreement now, before the first big bill.
  • Keep the child out of it. Kids shouldn't carry bills between houses or hear arguments about who owes what for their ear infection.

For questions about your own order, such as what yours requires, whether a medical support order is in place, or what happens if a parent changes jobs, ask the plan administrator (the HR or benefits office) or a family lawyer in your state.

Sources (8)

Photo: Doctor examines child during a routine checkup in a bright, welcoming clinic env by nenad53, BY 2.0.

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