Follicular lymphoma, unsp, intra-abdominal lymph nodes

This diagnosis code signifies a type of non-Hodgkin lymphoma originating from B-lymphocytes, specifically follicular lymphoma, where the primary or only known site of involvement is within the intra-abdominal lymph nodes. The "unspecified" nature indicates that the specific grade or other detailed characteristics of the follicular lymphoma are not documented.

Use this code when documentation confirms a diagnosis of follicular lymphoma confined to lymph nodes located within the abdominal cavity, and the specific grade (e.g., grade 1, 2, 3) is not provided by the clinician. This applies to initial diagnoses, follow-up care, or treatment encounters where the intra-abdominal involvement is the focus. Supporting documentation includes pathology reports confirming follicular lymphoma and imaging/clinical notes specifying intra-abdominal lymph node involvement without further grading.

• Ensure documentation explicitly states "intra-abdominal lymph nodes" to support this specific site.
• Avoid using this code if a specific grade of follicular lymphoma (e.g., grade 1, 2, 3) is documented; instead, use the more specific C82.0-C82.2- codes.
• Always sequence this code as the primary diagnosis when it is the reason for the encounter, unless another condition is clearly identified as the principal diagnosis.