8. CPT codes 64400-64530 describe injection of anesthetic agent for diagnostic or therapeutic purposes, the codes being distinguished from one another by the named nerve and whether a single or continuous infusion by catheter is utilized. All injections into the nerve including branches described (named) by the code descriptor at a single patient encounter constitute a single unit of service(UOS). For example:
(1) If a physician injects an anesthetic agent into multiple areas around the sciatic nerve at a single patient encounter, only one UOS of CPT code 64445 (injection, anesthetic agent; sciatic nerve, single) may be reported.
(2) If a physician injects the superior medial and lateral branches and inferior medial branches of the left genicular nerve, only one UOS of CPT code 64450 (Injection, anesthetic agent; other peripheral nerve or branch) may be reported regardless of the number of injections needed to block this nerve and its branches.
Dr. Louis Keppler in Cleveland, Ohio. St Vincent Hospital does piriformis muscle release surgery too. I had mine done last February. I took all my test results and history over 8 yrs to him. He knew right away he needed to do open incision, nerve expoloratory surgery. He found the piriformis muscle had scar tissue strangulating my siactic nerve. He cut it loose, and the tendon. I have some surgery scar pain now (7 months later) that aches when the weather fronts come through. My therapist and surgeon tell me it will get better with time. I just got an injection in the scar yesterday. At least this pain is not as bad as the PM pain before surgery. I am stronger and can sit much longer now.