Lymph nodes are not a bilateral site and are not coded as such. More information on regional lymph node coding are found on pages 38 - 40 in the TCR Handbook. Lymphomas are coded to the site but staged to the disease. Lymph nodes are not a paired organ. If a case is coded to C77.8, lymph nodes of multiple regions, the stage cannot be localized.
Lymphatic assessment is an involvement and has the potential to metastasize to lymph nodes.
Additional information is found on page 45 of the TCR Handbook. Remember that clinical lymph node information can be used to assign a Summary Stage if there is not any pathological information. Information regarding the proper coding of this field are found on pages 54 - 55 of the TCR Handbook. Supraclavicular node enlarged due to abdominal tumor Sr.