Wiki Debridement of talar osteochondral defect w/BioCartilage application

RebeccaMoney

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I need help with the above CPT. The description that the physician gave me is :Ankle Arthrotomy with debridement of talar osteochondral defect followed by bone marrow stimulation and application of BioCartilage. The defect is at the lateral talar dome. I'm thinking this is unlisted, 28899, and compare to 28446. Can anyone verify that?
Thanks,
 
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