C85.80

HCC Category Mapping

What This Code Means

A rare or unusual type of non-Hodgkin lymphoma (a blood cancer) with no specific lymph node location identified.

Coding Tips

• •Use this code only when the specific site of lymph node involvement is unknown or not documented
• •If site information becomes available, assign a more specific C85.8x code with the appropriate anatomical location

Clinical Significance

Other specified types of non-Hodgkin lymphoma at an unspecified site captures named NHL subtypes that do not have specific ICD-10 codes, such as intravascular large B-cell lymphoma, plasmablastic lymphoma, ALK-positive large B-cell lymphoma, or primary effusion lymphoma. These are typically rare, aggressive subtypes with unique clinical features and treatment approaches. The unspecified site should trigger a query for anatomical location.

Documentation Requirements

• ✓Pathology report identifying the specific non-Hodgkin lymphoma subtype by WHO classification name
• ✓Immunophenotyping and molecular studies confirming the specific entity
• ✓Query for anatomical site of involvement based on imaging or clinical findings
• ✓Documentation that the subtype does not have a more specific ICD-10 code (check C82, C83, C84, C86 categories first)

Commonly Confused Codes