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Per Coding Clinic - neoplasm of unspecified nature means that a preliminary diagnostic study has been performed that shows the mass to be a tumor which is not defined morphologically as of this time. Therefore it is a neoplastic process unspecified as to the morphology. However you have not indicated that any preliminary study has been performed so this could be an abcess or a cyst. Therefore it is still a symptom of a mass.
I would only use 789.32 if there is no specific indication of the location and origin of the mass, like a mass that is overlapping contigous sites like mass between pancreas and stomach. Otherwise code to the disease of the location of the mass.