Thank you, ksand24.
My entire pregnancy and birth was covered by the NHS, no outstanding medical bills. My reference to medical insurance was what I previously had in the US. My situation is/was a bit unusual. Everything was truthfully told on the visa application and the Health Surcharge was paid. If they want more money we will pay it but as of now there are no outstanding bills from the NHS. Since I will be an immigrant in England, if I ever get back there, I’ll have to graciously accept the double payment to the NHS.
They deserve it since I’ve already used it!
Okay, so if you were in the UK as a visitor, you were NOT covered to give birth on the NHS, and you should have made sure they gave you a bill for the birth, and that you paid it.
Even if the hospital told you you didn't have to pay, it's your responsibility to make them bill you and to pay the balance.
How long ago did you give birth?
Under current rules (in place for the last year or two), if you have travel/health insurance in the UK, you pay 100% of the full price of the treatment and if you do not have travel/health insurance, you will be charged 150% of the treatment price.
See:
https://www.nhs.uk/NHSEngland/AboutNHSservices/uk-visitors/visiting-england/Pages/visitors-from-outside-the-eea.aspxIf you declared that you gave birth in the UK as a visitor and you didn't provide receipts to show you paid for that birth, unfortunately, your visa will be refused (because giving birth in the UK costs a lot more than £500)