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ICD-10-CM Code C21.8
Malignant neoplasm of overlapping sites of rectum, anus and anal canal

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

C21.8 is a billable ICD code used to specify a diagnosis of malignant neoplasm of overlapping sites of rectum, anus and anal canal. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code C21 is used to code Colorectal cancer

Colorectal cancer (also known as colon cancer, rectal cancer, or bowel cancer) is the development of cancer in the colon or rectum (parts of the large intestine). It is due to the abnormal growth of cells that have the ability to invade or spread to other parts of the body. Signs and symptoms may include blood in the stool, a change in bowel movements, weight loss, and feeling tired all the time.

Specialty: Oncology
MeSH Codes: , ,
ICD 9 Codes: 153.0, 154.0, 154.1

Diagram of the lower gastrointestinal tract

Source: Wikipedia

Coding Notes for C21.8 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Malignant neoplasm of anorectal junction
Malignant neoplasm of anorectum
Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal

MS-DRG Mapping

  • DRG Group #374-376 - Digestive malignancy with MCC.
  • DRG Group #374-376 - Digestive malignancy with CC.
  • DRG Group #374-376 - Digestive malignancy without CC or MCC.

Coding Advice SNOMET-CT

  • Possible requirement for morphology code

ICD-10-CM Neoplasms Index References for 'C21.8 - Malignant neoplasm of overlapping sites of rectum, anus and anal canal'

The ICD-10-CM Neoplasms Index links the below-listed medical terms to the ICD code C21.8. Click on any term below to browse the neoplasms index.


Malignant neoplasm of other sites of rectum, rectosigmoid junction, and anus (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code C21.8 and a single ICD9 code, 154.8 is an approximate match for comparison and conversion purposes.

Parent Code: C21 - Malignant neoplasm of anus and anal canal

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/C218