2007 ICD-9-CM Procedure 93.98 Oher control of atmospheric pressure and composition 93.98 is a specific code that can be used to specify a procedure 93.98 contains 5 index entries View the full Volume 3 93.* hierarchy 93.98 also known as: Antigen-free air conditioning Helium therapy 93.98 excludes: inhaled nitric oxide therapy (INO) (00.12) Index entries containing 93.98: Control atmospheric pressure and composition NEC 93.98 antigen-free air conditioning 93.98 decompression chamber 93.97 mountain sanatorium 93.98 Mountain resort sanitarium 93.98 Therapy helium 93.98