C21.8
BillableMalig neoplasm of ovrlp sites of rectum, anus and anal canal
Malignant neoplasm of overlapping sites of rectum, anus and anal canal
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Malignant neoplasm of anorectal junction
- Malignant neoplasm of anorectum
- Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •gastrointestinal stromal tumorsA-)C49
- malignant carcinoid tumors of the colon (C7A.02-)
- •malignant melanoma of anal marginC43.51
- •malignant melanoma of anal skinC43.51
- •malignant melanoma of perianal skinC43.51
- •other and unspecified malignant neoplasm of anal margin, , ,C44.500, C44.510, C44.520, C44.590
- •other and unspecified malignant neoplasm of anal skin, , ,C44.500, C44.510, C44.520, C44.590
- •other and unspecified malignant neoplasm of perianal skin, , ,C44.500, C44.510, C44.520, C44.590
Related Codes(3)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(30)
SNOMED CT
- Overlapping malignant neoplasm of rectum, anus and anal canal109839004
- Malignant neoplasm of anorectal junction254586002
- Malignant tumor of anorectal junction254586002
- Malignant tumour of anorectal junction254586002
- Anorectal cancer443488001
- Malignant neoplasm of anorectum443488001
- Adenocarcinoma of anorectum447886005
- Anorectal adenocarcinoma447886005
UMLS
- Anorectal cancerC0864875
- Malignant neoplasm of anorectumC0864875
- Malignant neoplasm of anorectum (disorder)C0864875
- Malig neoplasm of ovrlp sites of rectum, anus and anal canalC0496781
- Malignant Neoplasm of Overlapping Sites of Rectum, Anus and Anal CanalC0496781
- Malignant neoplasm of overlapping sites of rectum, anus and anal canalC0496781
- Malignant neoplasm of anorectal junctionC0345887
- Malignant neoplasm of anorectal junction (disorder)C0345887
- Malignant tumor of anorectal junctionC0345887
- Malignant tumour of anorectal junctionC0345887
- Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canalC2837937
Clinical Terms
- Malignant tumour of anorectal junction
- Malignant neoplasm of anorectal junction
- Malignant neoplasm of anorectal junction (disorder)
- Malignant neoplasm of anorectum
- Anorectal adenocarcinoma
- Anorectal cancer
- Adenocarcinoma of anorectum
- Primary malignant neoplasm of two or more contiguous sites of rectum, anus and anal canal
- Malignant tumor of anorectal junction
- Malignant neoplasm of anorectum (disorder)
- Overlapping malignant neoplasm of rectum, anus and anal canal
Frequently Asked Questions
What is the ICD-10 code for malig neoplasm of ovrlp sites of rectum, anus and anal canal?
The ICD-10-CM code for malig neoplasm of ovrlp sites of rectum, anus and anal canal is C21.8. The full clinical description is "Malignant neoplasm of overlapping sites of rectum, anus and anal canal". C21.8 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code C21.8 mean?
ICD-10-CM code C21.8 represents “Malignant neoplasm of overlapping sites of rectum, anus and anal canal”. It is classified under Chapter 2: Neoplasms and is a billable/specific code that can be used on a claim.
Is C21.8 a billable code?
Yes, C21.8 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is C21.8 in?
C21.8 is in Chapter 2: Neoplasms (codes C00-D49).
What codes cannot be used with C21.8?
C21.8 has Excludes1 notes indicating codes that cannot be used together with it, including: Kaposi's sarcoma of gastrointestinal sites (C46.4).
What SNOMED CT codes does C21.8 map to?
C21.8 maps to 4 SNOMED CT concepts: 447886005, 443488001, 254586002, 109839004. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for C21.8?
C21.8 is linked to 4 UMLS Concept Unique Identifiers: C0864875, C0496781, C0345887, C2837937. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does C21.8 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like malig neoplasm of ovrlp sites of rectum, anus and anal canal affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of C21.8?
C21.8 maps to the ICD-11 code: 2C00.Z (Malignant neoplasms of anus or anal canal, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.