Therapists are responsible for compliance with the Correcting Coding Initiative. These compliance rules have complex guidelines on how “therapists” should apply modifiers to CPT codes provided. These rules are especially complex when treatments are provided by more than one discipline or for other special conditions. If modifiers are missing when these conditions are present, then the charges will be denied. These errors are costly both in terms of lost revenue and the time needed to research, re-bill, and recover that lost revenue.