C80.1 – Malignant (primary) neoplasm, unspecified
ICD-10-CM 2027 diagnosis code · Malignant neoplasms of ill-defined, other secondary and unspecified sites
- Code
C80.1(claims format:C801)- Description
- Malignant (primary) neoplasm, unspecified
- 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
- C80
Notes for C80.1
- Cancer NOS
- Cancer unspecified site (primary)
- Carcinoma unspecified site (primary)
- Malignancy unspecified site (primary)
- secondary malignant neoplasm of unspecified site (C79.9)
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
C80 – Malignant neoplasm without specification of site
- malignant carcinoid tumor of unspecified site (C7A.00)
- malignant neoplasm of specified multiple sites- code to each site
Index terms for C80.1
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in C80
Frequently asked questions
What is ICD-10 code C80.1?
C80.1 is the ICD-10-CM code for malignant (primary) neoplasm, unspecified, in the block C76-C80 (Malignant neoplasms of ill-defined, other secondary and unspecified sites).
Is C80.1 a billable code?
Yes. C80.1 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does C80.1 belong to?
It belongs to category C80 – Malignant neoplasm without specification of site.
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.