The Australian Federal Police have made available their crime categorization and prioritization model (CCPM), and to my knowledge this is the only publicly available one that I have found. If you know of another case categorization and prioritization model that is available, either publicly or for law enforcement specifically, please leave a comment or contact us. The CCPM is a good starting point for the categorization of all types of crime.
We are currently looking at applying the AFP's model as a template for the categorization and prioritization of crime with a digital component. Prioritization is an interesting problem, that will be discussed further later. But in attempting to prioritize, it is important to have crime categories clearly and meaningfully defined. We will be working on this more over the next few days.
Update: Financial fraud category reference: http://fightfraud.nv.gov/fin_fraud_types.htm