Malignant (primary) neoplasm, unspecified

ValidICD-10-CM diagnosis code.

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

What has happened to this code

Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2007 Added to the draft code set draft Malignant neoplasm, unspecified
FY2010 Draft description revised draft ~~Malignant neoplasm, unspecified~~ Malignant (primary) neoplasm, unspecified

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from C80 Malignant neoplasm without specification of site

Excludes1 - never coded here

malignant carcinoid tumor of unspecified site (C7A.00)
malignant neoplasm of specified multiple sites- code to each site

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

Tumor > malignant
Neoplasm, neoplastic
Cancer > unspecified site
Carcinoma > unspecified site
Malignancy > unspecified site
Tumor > malignant > mixed NEC
Tumor > malignant > giant cell
Tumor > malignant > small cell
Sarcomatosis > unspecified site
Tumor > malignant > spindle cell
Tumor > malignant > unclassified
Tumor > malignant > fusiform cell
Neoplasm, neoplastic > unknown site or unspecified

Codes in the same group

Code	Description	Status
C80.0	Disseminated malignant neoplasm, unspecified	Valid
C80.2	Malignant neoplasm associated with transplanted organ	Valid