Type 1 Osteotomy/Type 1 Schwab Osteotomy

I have a surgeon that performed a L4-L5 type 1 osteotomy. It looks like it's a total facetectomy. Has anyone coded a type 1 osteotomy? I have also seen it called a type 1 Schwab Osteotomy. Not sure of what CPT code to use.

Thanks!

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