The link that you were trying to access provided in the previous post is from UHC Oxford medical policy regarding pulsed RFA. The original question was in regards non-pulsed radiofrequency ablation of sympathetic chain with response that it is unlisted. Which concurs with the AMA response below.
Part of a private response I received from the AMA CPT Network,
“Based solely upon the information provided in your electronic inquiry, from a CPT coding perspective, there is no specific CPT code to describe “left radiofrequency lesioning of the lumbar sympathetic chain”. Therefore, code 64999, Unlisted procedure, nervous system, should be reported once even though the radiofrequency ablation was performed at more than one spinal level. When performing two or more procedures that require the use of the same unlisted code, the unlisted code used should only be reported once to identify the services provided. This is due to the fact that the unlisted code does not identify a specific unit value or service. Unit values are not assigned to unlisted codes since the codes do not identify usual procedural components or the effort/skill required for the service."