R18.8

ICD-10Billable

Other ascites

Official ICD-10-CM descriptor (FY2026)

Other ascites

R18.8 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

Ascites NOS
Peritoneal effusion (chronic)

Related codes in R18

R18.0Malignant ascites

Where this code sits

Chapter: 18. Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
Block: Symptoms and signs involving the digestive system and abdomen (R10-R19)
Parent code: R18

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.