EXTENSOR MECHANISM ALLOGRAFT RECONSTRUCTION

I need an answer ASAP.  Pt is having a total knee revision; extensor mechanism allograft, & removal of spacer.  I was thinking revision , 27487, removal of spacer, 11982.  What about the extensor mechanism allograft?  Dr. says that procedure takes a lot of time.  Is that an unlisted code & what would be the comparison? Or can I just add mod 22 to 27487.  Thank you,
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