R18 ICD-10-CM Code: Ascites
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
R18Ascites
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where R18 sits
- 1
Chapter 18
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)
- 2
Section
Symptoms and signs involving the digestive system and abdomen (R10-R19)
- 3
Category R18
Ascites
- 4
Code R18
Ascites
More specific choices
Codes under R18
R18 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for R18.
Code first
No “code first” instruction is listed for R18.
Use additional code
No “use additional code” instruction is listed for R18.
Excludes1
Conditions that should not be reported together with this code.
- ascites in alcoholic cirrhosis (K70.31)
- ascites in alcoholic hepatitis (K70.11)
- ascites in toxic liver disease with chronic active hepatitis (K71.51)
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for R18.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code R18 mean?
R18 is the FY 2027 U.S. ICD-10-CM code for “Ascites.”
Is R18 a billable or specific ICD-10-CM code?
No. R18 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is R18 located in ICD-10-CM?
R18 is listed in Chapter 18, Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99), within Symptoms and signs involving the digestive system and abdomen (R10-R19) (R10–R19), under category R18, Ascites.
What coding notes are listed for R18?
No inclusion terms are listed for R18 in this reference record. No code-first instruction is listed. Excludes1 notes: ascites in alcoholic cirrhosis (K70.31); ascites in alcoholic hepatitis (K70.11); ascites in toxic liver disease with chronic active hepatitis (K71.51). No Excludes2 note is listed.
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