Final answer:
The appropriate coding for a 5-year-old boy with symptomatic encephalopathy due to functional hyperinsulinism is E16.1 for hyperinsulinism and G94 for the encephalopathy associated with the disorder.
Step-by-step explanation:
The correct coding for the case of a 5-year-old boy being treated for symptomatic encephalopathy associated with functional hyperinsulinism is E16.1, G94. The code E16.1 pertains to hyperinsulinism, which is the excessive production of insulin. This condition may lead to hypoglycemia, causing symptoms such as sweating, tremors, and fainting attacks. G94, on the other hand, is used for encephalopathy in diseases classified elsewhere, which, in this case, is consequent to the hyperinsulinism. It is important to capture both the underlying hyperinsulinism and its neurological complication to reflect the full clinical picture