Abnormal findings in other body fluids and substances (R88) ICD-10-CM
The R88 code range covers abnormal findings in other body fluids and substances with 3 ICD-10-CM diagnosis codes. 2 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the R88 Range 3 codes · 2 billable
About the R88 Code Range
The ICD-10 code R88 category is used to identify abnormal findings in various body fluids and substances that do not yet have a specific diagnosis. These codes help document unusual test results, often guiding further medical investigation.
More specifically, R88.0 is applied to cases with a cloudy (hemodialysis or peritoneal) dialysis effluent, which may indicate infection or other complications in dialysis patients. This code is also known as "cloudy peritoneal dialysis effluent." Meanwhile, R88.8 covers a range of abnormal test results in other body fluids, including urea and electrolyte abnormalities, specific gravity deviations in pleural fluid, ascitic fluid chemistry outside normal limits, and abnormal amniotic fluid examinations. These terms, such as "urea level finding" or "pleural fluid specific gravity finding," help coders accurately assign R88.8 when lab findings are abnormal but a definitive diagnosis is not yet established. Using these codes correctly ensures clear documentation of abnormal lab observations in fluids related to kidney function, respiratory status, or pregnancy monitoring.
Questions About This Page
How many billable codes are in the R88 range?
Of the 3 codes in this range, 2 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the R88 range classify?
The range classifies abnormal findings in other body fluids and substances. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
