R18.0

Billable

Malignant ascites

R18.0 is the ICD-10-CM code for Malignant ascites. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
R00-R99
Parent
R18
Edition
FY2026

R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified

Code first

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

Frequently asked questions

What is ICD-10 code R18.0?
R18.0 is the ICD-10-CM code for "Malignant ascites". It falls under R00-R99 Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.
Is R18.0 a billable code?
Yes — R18.0 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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