Final answer:
Lymphomas can be found both in the neoplasm table and under the term lymphoma in the alpha index for coding purposes. They are classified into Hodgkin lymphoma and non-Hodgkin lymphoma, with specific subtypes identified via biopsy and immunohistochemistry.
Step-by-step explanation:
Lymphomas are cancers that originate in the immune system and are typically present in the lymph nodes. They can be classified into two main types: Hodgkin lymphoma (HL) and non-Hodgkin lymphoma (NHL), with NHL being more prevalent. The diagnosis of lymphoma involves a biopsy, where tissue is examined under a microscope and immunohistochemistry is used to identify specific cell-surface antigens to determine the subtype of lymphoma. When coding for medical purposes, lymphomas can be found in the neoplasm table or under the term lymphoma in the alpha index, depending on the coding system being used.