A non-custodial parent medical expense letter is a short, businesslike written request asking the other parent to reimburse their share of a child’s uninsured medical costs under your court order. To hold up if a judge ever sees it, the letter needs to cite the specific section of the order that creates the obligation, itemize every expense with supporting documents, state the exact dollar amount owed and a payment deadline, and go out by a method that proves delivery. Keep the tone neutral. The strongest letters are boring on purpose.
Read the Order Before You Draft
Pull your divorce decree, custody agreement, or child support order and find the section on medical expenses. Federal law requires every child support order to include a medical support provision, so yours has one even if you don’t remember it.1Office of the Law Revision Counsel. United States Code Title 42 – 666 Two things in that section control the letter you’re about to write.
First, the split. It’s usually a percentage tied to each parent’s income. A parent earning 60% of combined household income might owe 60% of every uninsured bill. Some orders use a flat 50/50 regardless of income. Others require the custodial parent to absorb a set dollar amount each year before the other parent’s share kicks in. Use the exact formula from your order as the backbone of your math.
Second, what counts as a reimbursable expense. Uninsured medical costs typically include co-pays, deductibles, prescription costs, and charges insurance doesn’t cover. Many orders also include dental, vision, and mental health treatment. Some orders separate routine expenses from extraordinary ones like braces, surgery, or long-term therapy, and require both parents to agree before incurring the larger expenses. If your order draws that line, make sure you followed the approval process before you ask for reimbursement.
What the Letter Needs to Contain
Think of the letter as a small evidence packet. Every element should be something you’d be comfortable handing a judge.
Itemize Each Expense
List every charge separately with the date of service, the provider’s name, and a short description of the treatment. “Dr. Patel, pediatric dentist — two cavities filled, 3/14/2026, $280” tells the other parent exactly what they’re looking at. If the child saw a specialist, note the specialty and the reason, such as a referral from the pediatrician. Vague entries like “medical expenses — $400” invite pushback because they give the other parent nothing to verify.
Cite the Court Order
Point to the specific section of your order that creates the expense-sharing obligation. You don’t need to quote it word for word. Something like “Per Section IV.B of our custody agreement dated June 12, 2022, each parent is responsible for 50% of uninsured medical expenses” removes any ambiguity about why you’re writing and signals that you’ve done the homework.
State the Amount Owed and a Deadline
Do the math for the other parent. If the total bill was $400 and they owe 60%, write “Your share: $240.” Then set a clear payment deadline. If your court order specifies a reimbursement window, use that. If it doesn’t, 30 days from the date of the letter is a widely accepted standard. Include your preferred payment method: electronic transfer, check mailed to a specific address, or payment through a co-parenting app. The easier you make it to pay, the more likely you are to get paid without a fight.
Attach the Proof
Attach copies, never originals, of every document that supports the request: the provider’s itemized bill, your receipt or proof of payment, and the insurance explanation of benefits showing what was and wasn’t covered. The explanation of benefits is especially important because it proves the expense wasn’t later reimbursed by insurance. For multiple expenses, a simple spreadsheet showing each charge, the insurance payment, and the remaining balance makes the package easier to follow. Redact account numbers and any sensitive information that isn’t relevant.
Send It So You Can Prove Delivery
If the other parent later claims they never received the request, you need proof that says otherwise. Send the letter by certified mail with return receipt requested through the U.S. Postal Service, which provides a tracking number and requires the recipient to sign upon delivery.2USPS. Certified Mail – The Basics
Keep a copy of everything you send: the letter, every attachment, the certified mail receipt, and the signed return card when it comes back. Some parents also email the same materials on the same day, which creates a second timestamp. If your court order specifies a particular delivery method, follow it exactly. That signed green card from the post office can become the most important piece of paper in your file if the case ever goes to enforcement.
Don’t Miss the Submission Window
Many court orders require the parent who pays a medical bill to notify the other parent within a set timeframe, often 30 to 60 days from the date of service or the date you receive the bill. This is where a lot of custodial parents lose money, not because the other parent refuses to pay, but because they waited too long to ask. If your order sets a submission deadline, treat it like a statute of limitations. A judge may deny the claim if you sat on the bill for six months, because the other parent had no chance to verify or dispute it in real time.
Even if your order is silent on timing, sending the letter within 30 days of paying the bill is hard to criticize. For ongoing treatment that generates bills over several months, a monthly summary works better than waiting until treatment is finished.
Head Off the “It Wasn’t Necessary” Dispute
The most common pushback isn’t over the math. It’s over whether the child actually needed the treatment. Routine care like checkups, vaccinations, and cavity fillings rarely triggers an argument. The friction usually starts with orthodontics, therapy, specialist visits, or treatments one parent pursued without consulting the other.
Courts generally look at whether the treatment was medically indicated for the child’s health and development. A recommendation from the child’s doctor carries significant weight, so keep referral letters and any written treatment plans and attach them to your letter when the expense is substantial. If you know an upcoming cost could be controversial, give the other parent advance notice even when the order doesn’t require it. A parent who was informed ahead of time and said nothing has a much harder time objecting after the fact than one who was blindsided by a $3,000 orthodontics bill.
Elective or cosmetic procedures usually don’t qualify for mandatory reimbursement unless both parents agree or a court specifically orders it. If you anticipate a fight about necessity, ask the provider to write a letter explaining why the treatment is medically appropriate and include it with your request. That letter can resolve the dispute before it reaches a courtroom.
A Simple Structure You Can Follow
A workable letter has six short parts, in this order:
- Date and both parents’ names and addresses at the top.
- A one-sentence opening stating that you’re requesting reimbursement under the medical expense provision of your order, with the order’s date and section number.
- An itemized list of each expense: date of service, provider, description, total charged, insurance payment, out-of-pocket amount.
- The total owed by the other parent, with the percentage from the order shown in the math.
- A payment deadline and your preferred method of payment, including the mailing address or app details.
- A list of the attachments: bills, receipts, explanations of benefits, and any supporting letters from providers.
Sign and date it. Keep the language factual. Avoid references to past disputes, the custody schedule, or anything unrelated to the money being requested. A letter that reads like an invoice is harder to argue with than one that reads like a grievance.
If the Deadline Passes Without Payment
Send a follow-up letter noting the missed deadline and stating that you’ll seek court enforcement if payment isn’t received within a specific number of days. Ten to 14 days is reasonable for a second notice. Keep the same businesslike tone. Escalation isn’t hostility; it’s building a paper trail that shows you gave every reasonable opportunity to comply before involving the court.
If the second notice goes unanswered, you can file a motion for contempt or a motion to enforce the support order with your family court. You’ll need to show the court your order, copies of the bills, proof that you sent the reimbursement request, and evidence the other parent received it but didn’t pay. This is exactly why the certified mail receipt and organized records matter.
Courts have real teeth when a parent is found in violation. Available enforcement tools include wage garnishment, with federal law capping support-related garnishment at 50% to 65% of disposable earnings depending on whether the parent supports other dependents and whether the debt is more than 12 weeks overdue;3Office of the Law Revision Counsel. United States Code Title 15 – 1673 interception of state and federal tax refunds; suspension of driver’s and professional licenses in many states; reporting of delinquent support to credit bureaus; denial of a U.S. passport for parents who owe $2,500 or more in past-due support;4Administration for Children and Families. Passport Denial Program 101 and contempt findings that can carry fines or jail time for willful refusal to comply.
None of these tools matters, though, if the underlying request wasn’t documented well. The letter you send today is what makes everything downstream possible.