Specific code 2014 ICD-9-CM Diagnosis Code 511.81
Malignant pleural effusion
  • Billable Code
  • Short description: Malignant pleural effusn.
  • ICD-9-CM 511.81 will be replaced by an equivalent ICD-10-CM code (or codes) when the United States transitions from ICD-9-CM to ICD-10-CM on October 1, 2015.
  • ICD-9-CM 511.81 is a billable medical code that can be used to specify a diagnosis on a reimbursement claim.
Disease Synonyms
  • Neoplastic pleural effusion
  • Pleural effusion due to malignancy
Clinical Information
  • A collection of fluid in the pleural cavity as a result of malignant disease. Malignant pleural effusion fluid often contains free-floating malignant cells.
  • A condition in which cancer causes an abnormal amount of fluid to collect between the thin layers of tissue (pleura) lining the outside of the lung and the wall of the chest cavity. Lung cancer, breast cancer, lymphoma, and leukemia cause most malignant pleural effusions.
  • Presence of fluid in the pleural cavity as a complication of malignant disease. Malignant pleural effusions often contain actual malignant cells.
Code First
  • Code first malignant neoplasm, if known
Convert to ICD-10-CM: 511.81 converts directly to:
  • 2014 ICD-10-CM J91.0 Malignant pleural effusion
ICD-9-CM Volume 2 Index entries containing back-references to 511.81:
  • Effusion
    • pleura, pleurisy, pleuritic, pleuropericardial 511.9
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 511.81 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2014 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.