Practical question, and please don't tell me to "negotiate with the hospital" — I've called nine times. I got a nineteen-thousand-dollar bill from an air ambulance and I need to know the actual sequence.

Here's the situation, as specifically as I can.

In June my son had an accident two hours from the nearest trauma center — rural, we were camping. He's fine now. He was airlifted, which I did not arrange and was not asked about and would have consented to instantly if asked, because he was unconscious.

The flight was billed at thirty-one thousand. My insurance — employer plan, a PPO, decent — paid about twelve thousand as an out-of-network allowed amount. The air ambulance company billed me the remaining nineteen thousand and change. That's the balance bill.

What I've already done, so nobody repeats it back to me:

I called the air ambulance company's billing department nine times over four months. I have been offered a payment plan at four hundred and ninety a month for forty-eight months. I have twice been told to apply for "financial hardship" and both times the application was denied without a stated reason, and both times the denial letter had no appeal instructions.

I called my insurer. They told me the claim processed correctly per the plan and that the air ambulance is not in network and that there's nothing further. I asked for that in writing and received a letter restating it in different words.

I filed an appeal with my insurer. Denied. I filed a second-level appeal. Denied.

I have read about the No Surprises Act. Here is exactly where I'm stuck, and this is my real question.

Everything I read says air ambulances are covered by the No Surprises Act and that balance billing for them is prohibited. Everything I read also says that the protection depends on things I can't verify from my kitchen table. So:

One: how do I determine whether my plan is actually subject to it? I've seen that self-funded employer plans are included, and I've also seen references to exceptions. Where in my plan documents does it say which one I am, and what exact phrase am I looking for?

My HR person did not know and said she would ask the broker, and that was six weeks ago.

Two: if the protection applies and the company billed me anyway — who do I report that to, and what happens? I've seen a federal complaint number mentioned. Has anyone actually filed one? What was the timeline, and did the bill stop while it was pending?

That last part is what I need most, because the account went to a collection agency in September and I have a credit score and a mortgage application in April.

Three: does my state matter here? I'm in a state with its own balance-billing law and I cannot work out whether it applies on top of the federal one or is superseded for my type of plan.

Four: is there a template letter? I've found three online, all from law firms, all vague. I want the one that someone sent and that actually produced a result, and I want to know whether to send it to the air ambulance company, the insurer, or the collection agency, and in what order.

I am not asking whether this is unjust. I know it's unjust. My son is fine and I'm grateful every day and I'd pay it if I had it and I don't have it. I'm asking for the sequence, from someone who got to the end of it.