C31 ICD-10-CM Code: Malignant neoplasm of accessory sinuses
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
C31Malignant neoplasm of accessory sinuses
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where C31 sits
- 1
Chapter 2
Neoplasms (C00-D49)
- 2
Section
Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
- 3
Category C31
Malignant neoplasm of accessory sinuses
- 4
Code C31
Malignant neoplasm of accessory sinuses
More specific choices
Codes under C31
C31 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for C31.
Code first
No “code first” instruction is listed for C31.
Use additional code
No “use additional code” instruction is listed for C31.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for C31.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for C31.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code C31 mean?
C31 is the FY 2027 U.S. ICD-10-CM code for “Malignant neoplasm of accessory sinuses.”
Is C31 a billable or specific ICD-10-CM code?
No. C31 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is C31 located in ICD-10-CM?
C31 is listed in Chapter 2, Neoplasms (C00-D49), within Malignant neoplasms of respiratory and intrathoracic organs (C30-C39) (C30–C39), under category C31, Malignant neoplasm of accessory sinuses.
What coding notes are listed for C31?
No inclusion terms are listed for C31 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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