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If a biopsy has not been performed to determine whether it is benign or malignant, any neoplasm code would be inappropriate. There is no specific code for an adrenal mass, so 255.9 would be appropriate until the nature of the mass is defined by pathology.
yes the 255 is more appropriate, if you need confirmation look in the code book under the subchapter for unspecified neoplasm, it states there that "the term "mass" unless otherwise stated, is not to be regarded as a neoplastic growth.
A coder may NOT code a neoplasm code (benign, malignant, uncertain behavior) without the benefit of a pathology report.