R18.0
BillableMalignant ascites
Malignant ascites
Coding Notes
Includes
Conditions included under this code
- fluid in peritoneal cavity
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •abnormal findings on antenatal screening of motherO28
- •certain conditions originating in the perinatal periodP04-P96
- signs and symptoms classified in the body system chapters
- •signs and symptoms of breast,N63, N64.5
- •congenital or infantile pylorospasmQ40.0
- •gastrointestinal hemorrhageK92.0-K92.2
- •intestinal obstructionK56
- •newborn gastrointestinal hemorrhageP54.0-P54.3
- •newborn intestinal obstructionP76
- •pylorospasmK31.3
- •signs and symptoms involving the urinary systemR30-R39
- •symptoms referable to female genital organsN94
- •symptoms referable to male genital organsN48-N50
Code First
The underlying condition must be sequenced before this code
Related Codes(1)
Also Known As / Clinical Terms(17)
SNOMED CT
UMLS
Clinical Terms
- Malignant ascites (disorder)
- Malignant Peritoneal Effusion
- Ascitic fluid examination abnormal
- Peritoneal fluid abnormal
- Ascitic fluid: malignant cells
- Ascites, Malignant
Frequently Asked Questions
What is the ICD-10 code for malignant ascites?
The ICD-10-CM code for malignant ascites is R18.0. The full clinical description is "Malignant ascites". R18.0 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code R18.0 mean?
ICD-10-CM code R18.0 represents “Malignant ascites”. It is classified under Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings and is a billable/specific code that can be used on a claim.
Is R18.0 a billable code?
Yes, R18.0 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is R18.0 in?
R18.0 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What codes cannot be used with R18.0?
R18.0 has Excludes1 notes indicating codes that cannot be used together with it, including: ascites in alcoholic cirrhosis (K70.31); ascites in alcoholic hepatitis (K70.11); ascites in toxic liver disease with chronic active hepatitis (K71.51).
What SNOMED CT codes does R18.0 map to?
R18.0 maps to 4 SNOMED CT concepts: 168011000, 168021008, 236005001, 442768008. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for R18.0?
R18.0 is linked to 1 UMLS Concept Unique Identifier: C0220656. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does R18.0 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like malignant ascites affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of R18.0?
There is no direct ICD-11 mapping available for R18.0 in the WHO crosswalk tables. This may mean the concept is classified differently in ICD-11. Use the ICD-10 to ICD-11 converter to search for related codes.
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.