ICD-10-CM Diagnosis Code C31.1
Diagnosis Code: C31.1 (Raw: C311)
Description: Malignant neoplasm of ethmoidal sinus
Classification: International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM)
Fiscal Year: 2026
CMS Section 111 Status: Valid for reporting.
Overview & Clinical Details
ICD-10-CM code C31.1 is designated for Malignant neoplasm of ethmoidal sinus. In medical documentation and insurance billing, this code is utilized to specify medical diagnosis for patient records, reimbursement workflows, and compliance under CMS Section 111 mandatory insurer reporting guidelines.