ICD-10-CM Diagnosis Code (2025)
Official Description for C21.8
Malignant neoplasm of overlapping sites of rectum, anus and anal canal
Coding Notes & Guidelines for C21.8
- Malignant neoplasm of anorectal junction
- Malignant neoplasm of anorectum
- Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal
Parent Code (Less Specific):
About ICD-10-CM Code C21.8 (Malignant neoplasm of overlapping sites of rectum)
ICD-10-CM code C21.8 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM C21.8 became effective on October 1, 2024.
This page provides detailed information about C21.8 - Malignant neoplasm of overlapping sites of rectum, anus and anal canal. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Malignant neoplasm of overlapping sites of rectum related to anus and anal canal.