ICD-10-CM 2027
ICD-10 code for abdominis hydrops
From the official ICD-10-CM alphabetic index entry “Hydrops › abdominis”. Page updated September 29, 2026.
About coding abdominis hydrops
The ICD-10-CM code for abdominis hydrops is R18.8 (Other ascites).
Within R18, choose R18.8 (Other ascites) only when documentation doesn't support a more specific option: malignant ascites (R18.0).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 947 (Signs and Symptoms with MCC, relative weight 1.261) and DRG 948 (Signs and Symptoms without MCC, relative weight 0.7835), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about abdominis hydrops ICD-10 codes
What is the ICD-10 code for abdominis hydrops?
- R18.8 — Other ascites.
Is R18.8 billable?
- Yes. R18.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R18.8 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R18.8 as a principal diagnosis.
Is R18.8 a CC or MCC?
- R18.8 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.