Abn lev substnc nonmed source in specmn fr dgstv org/abd cav

This code indicates the presence of abnormal levels of non-drug-related substances found in specimens obtained from the digestive system or abdominal cavity. This could include elevated or decreased levels of endogenous compounds, environmental toxins, or other non-pharmaceutical agents detected in gastric fluid, peritoneal fluid, or tissue biopsies from organs like the stomach, intestines, or liver. It signifies a laboratory finding rather than a specific disease.

Apply this code when laboratory results from digestive or abdominal specimens reveal atypical concentrations of substances not attributable to medication. This is often used when investigating unexplained abdominal symptoms, suspected poisoning, or metabolic disorders affecting the gastrointestinal tract. Documentation should clearly state the abnormal substance and its source (e.g., "elevated ammonia in peritoneal fluid," "heavy metals detected in gastric lavage").

• This code is for abnormal findings only; normal lab results are not coded.
• Always sequence this code after the definitive diagnosis or the symptom prompting the investigation, if known.
• Do not use this code if the abnormal substance is a prescribed medication or illicit drug; refer to codes in Chapter 18 (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified) for those scenarios.