C79.81
Billable codeSecondary malignant neoplasm of breast
The ICD-10 code for secondary malignant neoplasm of breast is C79.81.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- C79.82Secondary malignant neoplasm of genital organs
- C79.89Secondary malignant neoplasm of other specified sites
- C79.81Secondary malignant neoplasm of breast
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 19881
Associated MS-DRGs
C79.81 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 564Other Musculoskeletal System and Connective Tissue Diagnoses with MCC
- DRG 565Other Musculoskeletal System and Connective Tissue Diagnoses with CC
- DRG 566Other Musculoskeletal System and Connective Tissue Diagnoses without CC/MCC
- DRG 597Malignant Breast Disorders with MCC
- DRG 598Malignant Breast Disorders with CC
- DRG 599Malignant Breast Disorders without CC/MCC