Another thing to consider if you are looking a radiofrequency procedures is the changes in codes and the changes to reporting due to the changes in the code descriptiors that will be effective Jan. 1st 2012.
In AMA CPT Assistant, September 2004 they describe the reporting for a facet joint block as per facet level or medial branch block where two nerve might be injected but would still be reported per facet level innervated by those nerves. In contrast they describe that the radiofrequency procedures could be reported per nerve treated:
".....a left-sided L4-L5 intra-articular injection performed with a single needle puncture would be coded as 64475. Injection of the L3 and L4 medial branch nerves supplying the L4-L5 facet joint would also be coded as 64475, even though two separate injections are performed to effect the same result."
"The destruction by neurolytic agent (eg, chemical, thermal, electrical, radiofrequency) codes (64622-64627) refers to paravertebral facet joint nerve destruction at the cervical, thoracic, lumbar, or sacral region(s). Codes 64622-64627 are unilateral. Therefore, if neurolytic destruction of the paravertebral facet joint nerve is performed at both the right and left sides, then modifier 50 should be appended to the appropriate code to indicate that bilateral procedures were performed. Also, if fluoroscopic guidance and localization for needle placement and neurolysis is performed in conjunction with codes 64622- 64627, then code 76005 should be reported separately in addition to codes 64622-64627. Unlike facet joint nerve (medial branch) codes used to describe facet joint injection (64470-64480), facet nerve destruction codes 64622-64627 refer to individual nerve level destruction. Thus, although injection of the left L3 and L4 medial (facet joint) nerve would be code as 64475, destruction of the L3 and L4 medial branch nerves would be coded as 64622 and 64623."
In contrast in 2012 CPT Changes:
64633 Destruction by neurolytic agent, paravertebral facet joint nerve(s) with imaging guidance (fluroscopy or CT); cervical or thoracic; single facet joint
64634 cervical or thoracic, each additional facet joint (List separately in addition to code for the primary procedure)
64635 lumbar or sacral; single facet joint
64636 lumbar or sacral; each additional facet joint (List separately in addition to code for primary procedure)
"The paravertebral facet joint nerve codes 64622, 64623, 64626, and 64627 have been deleted. Four new codes have been established to more accurately reflect the work and anatomical site involved in these proceures. Prior to 2012, the unit of service used to report these procedures was a single nerve at a single vertebral level. However, two nerves innervate each facet joint, and there are two facet joints at each vertebral level. One or two facet joints at the same level potentially could be treated. As such, the vertebral level is of less significance than the number of facet joint treated, so using vertebral level as the unit of service is a single facet joint in new codes 64633, 64634 , 64635, and 64636, rather then a vertebral level."