Bone marrow aspiration from iliac crest for spine surgery

Anyone have any ideas why an L5 Spina bifida occulta pars fracture (22325) isn't included in the spine surgeries list that is a parent code for the bone marrow aspiration for spine surgery???   Some fractures are included and others are not.  What is the reason for that?  Anyone have any ideas???  Margie??  Ruby????  Anyone???  I hate to code it with a 20999 as I don't think the patient care coordinator got a preauth on that!  Help!!!
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