ICD-10-CM > R00-R99 > R10-R19 > R18 R18 Ascites Non-Billable/Non-Specific Includes fluid in peritoneal 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) Codes R18.0Malignant ascitesR18.8Other ascites