C31 is the authoritative medical code for Malignant neoplasm of accessory sinuses. This classification is used in medical billing and clinical recording to specify the clinical criteria for malignant neoplasm of accessory sinuses (ICD-10-CM C31), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Sequencing, inclusion, and exclusion notes published for C31 in the official ICD-10-CM tabular list.
Conditions the official ICD-10-CM tabular list includes under this code.
Conditions that can never be reported with this code; the two are mutually exclusive.
No. C31 (Malignant neoplasm of accessory sinuses) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Per Excludes1 instructions, C31 must not be reported with: mesothelioma (C45.-).
Official ICD-10-CM classifications in the same code family as C31, with their registry titles.
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: