All ICD10 Codes

C31

Non-Billable
ChapterC00–D49
Rankcategory
Official Description

Malignant neoplasm of accessory sinuses

Use a more specific code (6 billable)
C31.0Malignant neoplasm of maxillary sinusC31.1Malignant neoplasm of ethmoidal sinusC31.2Malignant neoplasm of frontal sinusC31.3Malignant neoplasm of sphenoid sinusC31.8Malignant neoplasm of overlapping sites of accessory sinusesC31.9Malignant neoplasm of accessory sinus, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 2: Neoplasms (C00-D49).

C30-C39 Parent Instructions

Includes
  • malignant neoplasm of middle ear
Excludes1(Not coded here. Use a different code.)
  • mesothelioma (C45.-)

Clinical Hierarchy

BillableHas subcodes
CH2Neoplasms (C00-D49)
C30-C39Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
C31Malignant neoplasm of accessory sinusesNot billable
C31.0Malignant neoplasm of maxillary sinusBillable
C31.1Malignant neoplasm of ethmoidal sinusBillable
C31.2Malignant neoplasm of frontal sinusBillable
C31.3Malignant neoplasm of sphenoid sinusBillable
C31.8Malignant neoplasm of overlapping sites of accessory sinusesBillable
C31.9Malignant neoplasm of accessory sinus, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to C31:

blockC30-C39
Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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