C79.81 – Secondary malignant neoplasm of breast
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of ill-defined, other secondary and unspecified sites
- Code
C79.81(claims format:C7981)- Description
- Secondary malignant neoplasm of breast
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 2. Neoplasms (C00-D49)
- Block
- C76-C80 Malignant neoplasms of ill-defined, other secondary and unspecified sites
- Parent codes
- C79 › C79.8
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C79 – Secondary malignant neoplasm of other and unspecified sites
Index terms for C79.81
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in C79.8
Frequently asked questions
What is ICD-10 code C79.81?
C79.81 is the ICD-10-CM code for secondary malignant neoplasm of breast, in the block C76-C80 (Malignant neoplasms of ill-defined, other secondary and unspecified sites).
Is C79.81 a billable code?
Yes. C79.81 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does C79.81 belong to?
It belongs to category C79 – Secondary malignant neoplasm of other and unspecified sites.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.