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R18.0 Malignant ascites

CategoryCODABLE

R18.0

Malignant ascites

CODING RULE

Code first: malignancy, such as:
malignant neoplasm of ovary (C56.-)
secondary malignant neoplasm of retroperitoneum and peritoneum (C78.6)

Chapter: XVIII · Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Section: R10-R19
Valid from

Source

CMS ICD-10-CM Tabular List, edition FY2026.