2007 ICD-9-CM Procedure 33.33 Pneumoperitoneum for collapse of lung 33.33 is a specific code that can be used to specify a procedure 33.33 contains 2 index entries View the full Volume 3 33.* hierarchy Index entries containing 33.33: Collapse, lung, surgical 33.39 by pneumoperitoneum 33.33 Pneumoperitoneum (surgically-induced) 54.96 for collapse of lung 33.33