R18
Non-billableAscites
Ascites
This is a header/category code. For billing purposes, use a more specific child code from the list below.
Status
Non-billable / Header
Block
R10-R19
Child Codes
2
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 mother (O28.-)
- certain conditions originating in the perinatal period (P04-P96)
- signs and symptoms classified in the body system chapters
- signs and symptoms of breast (N63, N64.5)
- congenital or infantile pylorospasm (Q40.0)
- gastrointestinal hemorrhage (K92.0-K92.2)
- intestinal obstruction (K56.-)
- newborn gastrointestinal hemorrhage (P54.0-P54.3)
- newborn intestinal obstruction (P76.-)
- pylorospasm (K31.3)
- signs and symptoms involving the urinary system (R30-R39)
- symptoms referable to female genital organs (N94.-)
- symptoms referable to male genital organs (N48-N50)
Child Codes (2)
Also Known As / Clinical Terms
UMLS
- Accumulation of fluid in the abdomenC0003962
- AscitesC0003962
- Ascites (disorder)C0003962
- Ascites NOSC0003962
- HydroperitoneumC0003962
- HydroperitoniaC0003962
- Hydrops abdominisC0003962
- abdominal dropsyC0003962
- ascitesC0003962
- hydroperitoneumC0003962
- hydroperitoniaC0003962
- hydrops abdominisC0003962
- peritoneal dropsyC0003962
- peritoneal exudateC0003962
- Fluid in peritoneal cavityC3665480
- Fluid in peritoneal cavity (finding)C3665480
- fluid in peritoneal cavityC3665480
Frequently Asked Questions
What is ICD-10 code R18?
ICD-10-CM code R18 represents "Ascites". It is a non-billable header code — use a more specific child code for billing purposes.
Is R18 a billable code?
No, R18 is a non-billable header code. You need to use one of its more specific child codes for billing. There are 2 child codes under R18.
What chapter is R18 in?
R18 is in Chapter 18: Symptoms, Signs and Abnormal Clinical and Laboratory Findings (codes R00-R99).
What codes cannot be used with R18?
R18 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 are the subcategories under R18?
R18 has 2 child codes, including: R18.0 (Malignant ascites), R18.8 (Other ascites).
What are the UMLS CUIs for R18?
R18 is linked to 2 UMLS Concept Unique Identifiers: C0003962, C3665480. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
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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.