Cancer - Primary Site Unknown

Legacy Content

This page is about the pre-ICD10 diagnosis coding schema. See the ICD10 Diagnosis List, or the following for similar diagnoses in ICD10:Primary malignancy (solid tumor) of site unknown or NOS, Site NOS, metastatic malignancy to it (also code primary site)

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edit dx infobox
Category/Organ System:	Category: Tumor (old)
Type:	Category: Medical Problem (old)
Main Diagnosis:	Primary Site Unknown
Sub Diagnosis:	74800 PRIMARY CA SITE UNKNOWN 74801 Metastatic
Diagnosis Code:	74800
Comorbid Diagnosis:	Yes
Charlson Comorbid coding (pre ICD10):	6
Program:
Status:

unknown_primary_origin

Since a cancer with primary site unknown is always a metastasis the codes 74800 and 74801 are equivalent.