C80.1
Billable codeMalignant (primary) neoplasm, unspecified
The ICD-10 code for malignant (primary) neoplasm, unspecified is C80.1.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
- secondary malignant neoplasm of unspecified site (C79.9)
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Cancer NOS
- Cancer unspecified site (primary)
- Carcinoma unspecified site (primary)
- Malignancy unspecified site (primary)
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This code describes an unspecified presentation. If the medical record documents a more specific detail (e.g. laterality, type, or affected site), a more specific sibling code should be used instead — see Related codes below.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- C80.0Disseminated malignant neoplasm, unspecified
- C80.2Malignant neoplasm associated with transplanted organ
- C80.1Malignant (primary) neoplasm, unspecified
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 1991Approximate match
Associated MS-DRGs
C80.1 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.
- DRG 814Reticuloendothelial and Immunity Disorders with MCC
- DRG 815Reticuloendothelial and Immunity Disorders with CC
- DRG 816Reticuloendothelial and Immunity Disorders without CC/MCC
- DRG 826Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with MCC
- DRG 827Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures with CC
- DRG 828Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Major O.R. Procedures without CC/MCC
- DRG 829Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Other Procedures with CC/MCC
- DRG 830Myeloproliferative Disorders or Poorly Differentiated Neoplasms with Other Procedures without CC/MCC
- DRG 843Other Myeloproliferative Disorders or Poorly Differentiated Neoplastic Diagnoses with MCC
- DRG 844Other Myeloproliferative Disorders or Poorly Differentiated Neoplastic Diagnoses with CC
- DRG 845Other Myeloproliferative Disorders or Poorly Differentiated Neoplastic Diagnoses without CC/MCC