I agree it might be best not to bring it up with my T, but here's the way it looks on my Explanation of Benefits forms:

In one form Sept., 2012, amount charged is $150. The allowable charge was $129.50 and my coinsurance (copay) was $25.90. They paid her $103.60. It's been that way for 3 years. The one charge per visit.

Now, in 2013, they have 2 amounts for the same date.
Amount charged; $150.00, allowable charge $128.10, coinsurance $25.62, amount paid to her, $102.48.

Amount charged: $125.00, allowable charge $58.10, coinsurance $11.62, amount paid to her, $46.48.

Then it's added up to a total of $275.00, allowable charge of 186.20, copay 37.24 and amount paid $148.96.

I THINK my T charges $150 for 90 minutes. So, now she's getting $186.20 instead. I think I can ask to pay my former copay unless she raised her fee to $186.00. Does that make sense or not? She wouldn't charge a weird number like that! Her website says $125 for an hour, I think, but that's old. So I will ask her tomorrow if I get to it. I hate spending time on her fee!! My H wants me to pay her $2.00 since that would add up to $150. He's very logical, but of no help whatsoever. He also said to go back to one hour, that 90 minutes just means I can tell her "I love you" more. He, my H, can be so hurtful!!! He's mean and when I tell him that he doesn't understand. I make use of that extra 30 minutes and it would be hard to cut back to 60 minutes now.