2019 ICD-10-CM Diagnosis Code C80.1

Malignant (primary) neoplasm, unspecified

Applicable To
  • Cancer NOS
  • Cancer unspecified site (primary)
  • Carcinoma unspecified site (primary)
  • Malignancy unspecified site (primary)
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as C80.1. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • secondary malignant neoplasm of unspecified site (
    ICD-10-CM Diagnosis Code C79.9

    Secondary malignant neoplasm of unspecified site

      2016 2017 2018 2019 Billable/Specific Code
    Applicable To
    • Metastatic cancer NOS
    • Metastatic disease NOS
    Type 1 Excludes
    • carcinomatosis NOS (C80.0)
    • generalized cancer NOS (C80.0)
    • malignant (primary) neoplasm of unspecified site (C80.1)
The following code(s) above C80.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to C80.1:
  • C00-D49
    2019 ICD-10-CM Range C00-D49


    • Functional activity
    • All neoplasms are classified in this chapter, whether they are functionally active or not. An additional code from Chapter 4 may be used, to identify functional activity associated with any neoplasm.
    • Morphology [Histology]
    • Chapter 2 classifies neoplasms primarily by site (topography), with broad groupings for behavior, malignant, in situ, benign, etc. The Table of Neoplasms should be used to identify the correct topography code. In a few cases, such as for malignant melanoma and certain neuroendocrine tumors, the morphology (histologic type) is included in the category and codes.
    • Primary malignant neoplasms overlapping site boundaries
    • A primary malignant neoplasm that overlaps two or more contiguous (next to each other) sites should be classified to the subcategory/code .8 ('overlapping lesion'), unless the combination is specifically indexed elsewhere. For multiple neoplasms of the same site that are not contiguous, such as tumors in different quadrants of the same breast, codes for each site should be assigned.
    • Malignant neoplasm of ectopic tissue
    • Malignant neoplasms of ectopic tissue are to be coded to the site mentioned, e.g., ectopic pancreatic malignant neoplasms are coded to pancreas, unspecified (C25.9).
  • C80
    ICD-10-CM Diagnosis Code C80

    Malignant neoplasm without specification of site

      2016 2017 2018 2019 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • malignant carcinoid tumor of unspecified site (C7A.00)
    • malignant neoplasm of specified multiple sites- code to each site
    Malignant neoplasm without specification of site
Approximate Synonyms Clinical Information ICD-10-CM C80.1 is grouped within Diagnostic Related Group(s) (MS-DRG v36.0):

Convert C80.1 to ICD-9-CM

Code History
Code annotations containing back-references to C80.1:

Diagnosis Index entries containing back-references to C80.1:

ICD-10-CM Codes Adjacent To C80.1
C79.70 Secondary malignant neoplasm of unspecified adrenal gland
C79.71 Secondary malignant neoplasm of right adrenal gland
C79.72 Secondary malignant neoplasm of left adrenal gland
C79.8 Secondary malignant neoplasm of other specified sites
C79.81 Secondary malignant neoplasm of breast
C79.82 Secondary malignant neoplasm of genital organs
C79.89 Secondary malignant neoplasm of other specified sites
C79.9 Secondary malignant neoplasm of unspecified site
C80 Malignant neoplasm without specification of site
C80.0 Disseminated malignant neoplasm, unspecified
C80.1 Malignant (primary) neoplasm, unspecified
C80.2 Malignant neoplasm associated with transplanted organ
C81 Hodgkin lymphoma
C81.0 Nodular lymphocyte predominant Hodgkin lymphoma
C81.00 …… unspecified site
C81.01 …… lymph nodes of head, face, and neck
C81.02 …… intrathoracic lymph nodes
C81.03 …… intra-abdominal lymph nodes
C81.04 …… lymph nodes of axilla and upper limb
C81.05 …… lymph nodes of inguinal region and lower limb
C81.06 …… intrapelvic lymph nodes

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.