There's a difference between a statement (like your friend received about the $238) and an invoice. Sounds like your friend won't know the actual amount due until it's processed by her AARP insurance. I gathered by Debs post she is receiving the final bill after insurances have paid their portions.
I could be wrong of course.
This is a copay with a fixed amount. My post #47 explains
Copayment
A fixed amount ($20, for example) you pay for a covered health care service after you've paid your deductible.
Let's say your health insurance plan's allowable cost for a doctor's office visit is $100. Your copayment for a doctor visit is $20.
If you've paid your deductible: You pay $20, usually at the time of the visit.
If you haven't met your deductible: You pay $100, the full allowable amount for the visit.
Copayments (sometimes called "copays") can vary for different services within the same plan, like drugs, lab tests, and visits to specialists.
Generally plans with lower monthly premiums have higher copayments. Plans with higher monthly premiums usually have lower copayments.
Deb's post was clear about this being a copay.
Deb's post #5
I have traditional Medicare and a supplimental plan and it looked on the bill that they had submitted it to them. This is only a $25 co-pay for an exam and "imaging".
Her delay in paying is the crux of all the posts. Why not paying the copay for several months then posting that she wants to save the cost of postage for continued billing for an unpaid copay doesn't make sense to those of us that pay bills when billed.