Oth types of follicular lymphoma, intrathoracic lymph nodes

This code signifies a diagnosis of follicular lymphoma that is not otherwise specified as grade I, II, III, or in situ, and is specifically located within the intrathoracic lymph nodes. Follicular lymphoma is a slow-growing type of non-Hodgkin lymphoma originating from B-lymphocytes.

Apply this code when documentation specifies follicular lymphoma of an unspecified or "other" type, with clear evidence of involvement of lymph nodes within the chest cavity (e.g., mediastinal, hilar, or tracheobronchial lymph nodes). This code is appropriate when the specific grade of follicular lymphoma is not documented or when the pathologist identifies a variant not covered by other specific follicular lymphoma codes.

• Ensure the documentation explicitly states "intrathoracic lymph nodes" or lists specific intrathoracic lymph node sites.
• Do not use this code if a specific grade (e.g., grade I, II, III) of follicular lymphoma is documented; instead, use the appropriate C82.0-C82.3 code.
• Always sequence this code as a primary diagnosis when it is the reason for the encounter, unless another condition is clearly identified as the principal diagnosis.