What does CPT code 99904 mean?

CPT code 99904 is used to indicate a procedure for a specific type of medical service, often relating to an unspecified procedure or service that does not have a defined code. It is typically used when a healthcare provider performs a service that falls outside standard categories and needs to be reported for billing purposes. However, it's essential to consult the most current CPT coding guidelines or a medical billing expert for specific details about its use and implications.