C83.13

HCC Category Mapping

What This Code Means

Mantle cell lymphoma is a type of cancer that starts in the lymph nodes located inside the abdomen. It affects a specific type of white blood cell and typically requires chemotherapy or other cancer treatments.

Coding Tips

• •Verify the anatomical site is specifically documented as intra-abdominal (within the abdomen) rather than other lymph node locations, as this affects the fifth character of the code
• •Ensure the histology is confirmed as mantle cell lymphoma through pathology report; do not assume based on clinical suspicion alone

Clinical Significance

Mantle cell lymphoma of intra-abdominal lymph nodes is a common presentation given that mantle cell lymphoma frequently involves the gastrointestinal tract and associated lymph nodes. Abdominal involvement may cause pain, bowel obstruction, or masses detectable on imaging, and is typically identified during staging workup.

Documentation Requirements

• ✓Pathology-confirmed mantle cell lymphoma diagnosis
• ✓CT abdomen/pelvis or PET/CT documenting intra-abdominal lymph node involvement
• ✓Specific node groups identified (mesenteric, retroperitoneal, celiac, para-aortic)
• ✓Assessment for concurrent GI tract involvement (lymphomatoid polyposis)
• ✓Colonoscopy/endoscopy results if GI involvement is suspected

Commonly Confused Codes