A18.39
BillableRetroperitoneal tuberculosis
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
This is a tuberculosis infection that affects the retroperitoneal space, which is the area behind the abdominal cavity containing organs like the kidneys and pancreas. It represents an extrapulmonary form of TB that has spread beyond the lungs to this specific anatomical region.
Coding Tips
- •This code requires confirmation of tuberculosis diagnosis with appropriate testing (culture, AFB smear, or molecular testing) and documentation of the retroperitoneal location, often confirmed by imaging studies
- •Verify that the TB is extrapulmonary and specifically retroperitoneal; if pulmonary TB is also present, code both the pulmonary TB and this extrapulmonary site separately
Code Hierarchy
└A18Tuberculosis of other organs└A18.3Tuberculosis of intestines, peritoneum and mesenteric glands└A18.39Retroperitoneal tuberculosis
└A18.39Retroperitoneal tuberculosis