2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Other Diseases Of Respiratory System 510-519 > 2008 ICD-9-CM Diagnosis 512 Pneumothorax  On October 1, 2008 the 2009 ICD-9-CM codes came into effect. Therefore, this code may be out of date. The 2009 version of ICD-9-CM 512 can be accessed here. An accumulation of air or gas in the pleural space, which may occur spontaneously or as a result of trauma or a pathological process, or be introduced deliberately ( = PNEUMOTHORAX, ARTIFICIAL). (Dorland, 27th ed) Pneumothorax; abnormal presence of air in the pleural cavity resulting in the collapse of the lung. 512 is a non-specific code that cannot be used to specify a diagnosis ICD9Data's sister site ProcedureCodes.com launches with the 2008/09 CPT® codes - read more on the ICD9Data.com blog.