C31
Header — not billableMalignant neoplasm of accessory sinuses
The ICD-10 code for malignant neoplasm of accessory sinuses is C31.
C31 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 more specific codes below.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under C31
Related codes in this category
- C30Malignant neoplasm of nasal cavity and middle earnon-billable header
- C32Malignant neoplasm of larynxnon-billable header
- C33Malignant neoplasm of trachea
- C34Malignant neoplasm of bronchus and lungnon-billable header
- C37Malignant neoplasm of thymus
- C38Malignant neoplasm of heart, mediastinum and pleuranon-billable header
- C39Malignant neoplasm of other and ill-defined sites in the respiratory system and intrathoracic organsnon-billable header
- C31Malignant neoplasm of accessory sinusesnon-billable header