Absolutely! In our family we have 2 coeliacs. I claim PIP due to having arthritis. On a day to day basis them being coeliac costs us much more than me having arthritis. My medications are all covered on the nhs. Their 'medication' is gluten free food, which is crazy expensive - gf bread in an equivalent amount to a standard loaf of bread costing £1, is at least £9 (loaves are £3-4 but are about a third of the size). Pizza's, chicken nuggets, cereals etc are crazy expensive also. We try to use naturally gf options where possible, but this comes with potential for cross contamination.
In Wales I think they get a supermarket voucher for gf foods, we get nothing. Our shopping bill has nearly doubled since they were diagnosed, and there is the constant mental load of making sure DD doesn't eat something she shouldn't, reading every packet, doing hours of research before we go on any holiday to make sure there are suitable places to eat out, which often requires travelling further and more petrol. She couldn't access free school meals as the provider couldn't guarantee safety. Having to host all the play dates (and feed them) as other parents dont feel confident to feed her.
We can absorb these costs but cutting back elsewhere. Some families may not, and they have no choice but to not give gf foods as they can't afford it, harming their child in the process
There were ideally be some correlation between PIP and costs incurred, but that would be too challenging to work out