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Isn't there something in writing somewhere either in the ICD-9 coding guidelines, the ICD-9 manual itself, or CMS that one should not code a "mass" as a neoplasm unless specified as such? I need to find it...if it exists.
A neoplasm is any new or abnormal growth in which cell multiplication is uncontrolled and progressive.
A mass or lesion is not necessarily a neoplasm. Do not assign a neoplasm code unless the diagnosis documented by the physician is indexed to a neoplasm code in ICD-9-CM. For a diagnosis of “mass,” look in the Alphabetic Index under main term “mass.” If there is no subterm listed for the site you are trying to code, follow the instructions in the subterm for “specified organ NEC”