Eliminate Common Errors When billing orthopedic procedures performed in ASCs, the following errors crop up most frequently, Weston says: Coding abrasion arthroplasties as 29879 when the documentation does not support the code.'-The operative report should clearly state -subchondral- or -bleeding bone- - to support 29879, Weston says. Another common problem is the omission of reporting additional units of 29879 when the surgeon performs this in more than one compartment. Distal radius fractures. -While they are great codes to have, the surgeon doesn't always indicate the number of fracture fragments that are being fixated,- Weston says. Misuse of 23420 (Reconstruction of complete shoulder cuff avulsion, chronic). The October 2005 CPT Assistant states that this code -is intended to identify an old tear. This type of extreme tear usually requires rearrangement of the normal anatomy and sometimes grafting with either biological or nonbiological material for repair.- Misuse of 23120 (Claviculectomy; partial) and 29824 (Arthroscopy ... distal claviculectomy). You shouldn't use these codes for coplaning of the AC joint. Omission of 29822 (Arthroscopy, shoulder ... debridement, limited) when debridement is the definitive treatment for a structure that is not involved in other arthroscopic procedures (such as labral debridement with AC joint decompression and acromioplasty), Weston says. The two codes are both reportable in this scenario because the labral debridement is done in the glenohumeral joint while the subacromial decompression is performed in the subacromial space.