COMPauditor, 64999 is the only code per AMA CPT Assistant that can be reported for the ganglion impar block.
Surgery: Nervous System
CPT Assistant September 2007, Volume 17, Issue 9, pages 10-11
Question:
What is the appropriate CPT code to report for a ganglion impar sympathetic block?
Answer:
Code 64999, Unlisted procedure, nervous system, should be reported. When reporting an unlisted code to describe a procedure or service, it will be necessary to submit supporting documentation (eg, a procedure report) along with the claim to provide an adequate description of the nature, extent, and need for the procedure and the time, effort, and equipment necessary to provide the service.