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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Respiratory System 460-519 > Other Diseases Of Respiratory System 510-519 > Pleurisy 511.* > 2007 ICD-9-CM Diagnosis 511.9 Unspecified pleural effusion  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 Therefore, this code may be out of date.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 511.9 can be accessed here. An abnormal collection of fluid between the thin layers of tissue (pleura) lining the lung and the wall of the chest cavity. Increased amounts of fluid within the pleural cavity containing no malignant cells Presence of fluid in the pleural cavity resulting from excessive transudation or exudation from the pleural surfaces. It is a sign of disease and not a diagnosis in itself. 511.9 is a specific code that can be used to specify a diagnosis 511.9 contains 11 index entries View the ICD-9-CM Volume 1 511.* hierarchy 511.9 also known as: Pleural effusion NOS Pleurisy: exudative serofibrinous serous with effusion NOS Index entries containing 511.9: Dropsy, dropsical (see also Edema) 782.3 chest 511.9 Effusion pleura, pleurisy, pleuritic, pleuropericardial 511.9 bacterial, nontuberculous 511.1 fetus or newborn 511.9 malignant 197.2 nontuberculous 511.9 bacterial 511.1 pneumococcal 511.1 staphylococcal 511.1 streptococcal 511.1 traumatic 862.29 with open wound 862.39 tuberculous (see also Tuberculosis, pleura) 012.0 primary progressive 010.1 Fluid chest (see also Pleurisy, with effusion) 511.9 pleural cavity (see also Pleurisy, with effusion) 511.9 Pleurisy (acute) (adhesive) (chronic) (costal) (diaphragmatic) (double) (dry) (fetid) (fibrinous) (fibrous) (interlobar) (latent) (lung) (old) (plastic) (primary) (residual) (sicca) (sterile) (subacute) (unresolved) (with adherent pleura) 511.0 with effusion (without mention of cause) 511.9 bacterial, nontuberculous 511.1 nontuberculous NEC 511.9 bacterial 511.1 pneumococcal 511.1 specified type NEC 511.8 staphylococcal 511.1 streptococcal 511.1 tuberculous (see also Tuberculosis, pleura) 012.0 primary, progressive 010.1 exudative (see also Pleurisy, with effusion) 511.9 bacterial, nontuberculous 511.1 serofibrinous (see also Pleurisy, with effusion) 511.9 bacterial, nontuberculous 511.1 serous (see also Pleurisy, with effusion) 511.9 bacterial, nontuberculous 511.1