Posterior fusion

Per Coding Clinic 4Q10p125-129, facets are part of the posterior spinal column.  If a fusion requires a bone graft (CC1Q18p22-23), does use of a bone graft indicate that a “posterior column fusion” was done when packed into the facet joint as well as into the posterolateral gutter, following an anterior column fusion?  This distinction has DRG impact.

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