Hi Guest! Great question. In Aetna”s medical policy titled: Distraction Osteogenesis for Craniofacial Defects, the following codes are listed: “CPT codes covered if selection criteria are met: 20692 – Application of multiplane (pins or wires in more than one plane), unilateral, external fixation system (eg, Ilizarov, Monticelli type) 20693 – Adjustment or revision of external fixation system requiring anesthesia (eg, new pin(s) or wire(s) and/or new ring(s) or bar(s)) 20694 – Removal, under anesthesia, of external fixation system 20696 – Application of multiplane (pins or wires in more than one plane), unilateral, external fixation with stereotactic computer-hyphenassisted adjustment (eg, spatial frame), including imaging; initial and subsequent alignment(s), assessment(s), and computation(s) of adjustment schedule(s) 20697 – exchange (ie, removal and replacement) of strut, each” Here is a link to the policy: Hope this helps!