Per AMA
September 2007; Volume 17: Issue 9
Coding Communication: Surgery: Nervous System
Question: What is the appropriate CPT code to report for a ganglion impar sympathetic block?
AMA Comment: 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.
Hope this helps
Melissa Harris, CPC
The Albany and Saratoga Centers for Pain Management