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C312026

Non-billable

Malignant neoplasm of accessory sinuses

C31 is a non-billable ICD-10-CM category (header) code for Malignant neoplasm of accessory sinuses; a more specific code below it is required for claims in the FY2026 code set.

Clinical Notes

    From C30-C39
    • Mesothelioma (C45.-)

    Frequently Asked Questions

    Code Hierarchy
    C31
    Malignant neoplasm of accessory sinuses
    C31.0
    ...maxillary sinus
    C31.1
    ...ethmoidal sinus
    C31.2
    ...frontal sinus
    C31.3
    ...sphenoid sinus
    C31.8
    ...overlapping sites of accessory sinuses
    C31.9
    ...sinus, unspecified

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    Related MS-DRGs
    33,612 Medicare hospitalizations across 5 DRGs for codes in C31

    Top DRGs associated with codes in this category:

    011TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH MCC10,128
    012TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITH CC9,216
    146EAR, NOSE, MOUTH AND THROAT MALIGNANCY WITH MCC7,260
    147EAR, NOSE, MOUTH AND THROAT MALIGNANCY WITH CC4,134
    013TRACHEOSTOMY FOR FACE, MOUTH AND NECK DIAGNOSES OR LARYNGECTOMY WITHOUT CC/MCC1,938
    Official Guidelines
    Chapter 2: Neoplasms

    Official coding guidelines for C00-D49

    Malignant neoplasm of accessory sinuses - ICD-10 Code C31 | FindICD10