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A18.31

Billable

Tuberculous peritonitis

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

This is a serious infection of the lining that covers the organs inside the abdomen, caused by the tuberculosis bacteria. It occurs when TB spreads from the lungs or other parts of the body to infect the abdominal cavity.

Coding Tips

  • •This code requires confirmation of tuberculosis diagnosis with documentation of the specific site (peritonitis) - ensure the medical record clearly states 'tuberculous peritonitis' rather than just peritonitis
  • •Verify if this is pulmonary TB with peritoneal involvement or extrapulmonary TB; additional codes may be needed to capture the primary TB site if applicable

Code Hierarchy

└A18Tuberculosis of other organs└A18.3Tuberculosis of intestines, peritoneum and mesenteric glands└A18.31Tuberculous peritonitis
└A18.31Tuberculous peritonitis

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