Non-specific code icon 2014 ICD-10-CM Diagnosis Code R18


  • R18 is not a billable ICD-10-CM diagnosis code and cannot be used to indicate a medical diagnosis as there are 2 codes below R18 that describe this diagnosis in greater detail.
  • ICD-10-CM codes become active beginning October 1, 2015, therefore, this and all ICD-10-CM diagnosis codes should only be used for training or planning purposes until then.
Clinical Information
  • (ah-sye-teez) abnormal buildup of fluid in the abdomen.
  • A disorder characterized by accumulation of serous or hemorrhagic fluid in the peritoneal cavity.
  • Abnormal buildup of fluid in the abdomen that may cause swelling. In late-stage cancer, tumor cells may be found in the fluid in the abdomen. Ascites also occurs in patients with liver disease.
  • Accumulation of fluid in the peritoneal cavity. The fluid may be serous, hemorrhagic, or the result of tumor metastasis to the peritoneum.
  • Accumulation or retention of free fluid within the peritoneal cavity.
  • An abnormal accumulation of serous fluid in the abdominal cavity
  • Effusion and accumulation of serous fluid in the abdominal cavity.
Type 1 Excludes
  • ascites in alcoholic cirrhosis (K70.31)
  • ascites in alcoholic hepatitis (K70.11)
  • ascites in toxic liver disease with chronic active hepatitis (K71.51)
  • fluid in peritoneal cavity
Mortality Data
  • Between 1999-2007 there were 92 deaths in the United States where ICD-10 R18 was indicated as the underlying cause of death [source: cdc.govlink to]
  • ICD-10 R18 as underlying cause of death data broken down by: gender, age, race, year