Similar for a close family member with a strange heart and immune condition.
InsuranceCo BCBS had some bureaucrat without even a medical degree directly second-guessing the tests ordered by the literal Director of Cardiology at the world-renowned Mayo Clinic.
All I can think is: "Who the fck are you to even begin to question this expert, and deny his recommendation?". Now, IFF they had some actual peer reviewing it (e.g., the head of cardiology at Cleveland Clinic or Harvard Med School), that might be legit, but this is nothing of the sort. It's like the tech giant's arbitrary terminating accounts with support, except instead of cutting off your livelihood, they are killing you.
It is the death of expertise. It seems like practicing medicine without a license and without even seeing the patient (which is legally required before writing many prescriptions).
Why it is even close to legal is utterly baffling.
(I hope your dad continues to recover)