If a service item is missing or not defined, it can be requested to be included in the LKAAT tariff for the following year. The tariff partners will then conduct a thorough review of the application to determine if the requested service should be incorporated into the appropriate capitulum and if it can be billed in the current application year using an analog service. This determination is documented by activating a reserve code by defining a name (medical description) and billable analog position as its reference code.
 
Utilizing analog services entails implementing billing mechanisms for services that have not yet been incorporated into the LKAAT framework.
 
Reserve codes in the LKAAT without a medical description can be activated by the OAAT during the year with a medical description and an analog service code. Billing a reserve code service requires entering its analog position (grouper-relevant). At the same time, the reserve code service is defined for documentation purposes only.