Can an insurance company link food allergies to past pancreatitis?

I’m trying to get my insurance company to pay for my cat’s treatment. She has been vomiting a lot from December until now. The new vet did proper testing and found it’s likely an allergy, but we’re still waiting on results. They’ve checked her intestines and confirmed her liver and pancreas are okay, but her intestines show inflammation.

Back in 2017, when she was a kitten, she had diarrhea and stomach pain. They put her on special food to help with her stomach and discovered slight inflammation in her pancreas. She recovered and has been eating regular grocery store food since. Now, the insurance company says it’s allergy-related, but I don’t see anything in her medical records to suggest allergies. The vet just put her on a hydrolyzed diet for two months. The insurance only mentions pancreatitis in the past tests. Could they connect the allergy to the old pancreatitis diagnosis?

Unfortunately, back in 2017, they treated her empirically for the possibility of food allergies, which is a reasonable medical choice at the time, but now it’s causing problems with the insurance. I’d suggest challenging the case, arguing that the short-term use of a bland or sensitive stomach diet doesn’t mean an allergy diagnosis. The medical records show that the actual diagnosis was pancreatitis.