C21.1
BillableMalignant neoplasm of anal canal
Malignant neoplasm of anal canal
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Malignant neoplasm of anal sphincter
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(72)
SNOMED CT
- Primary malignant neoplasm of anal canal93669004
- Primary malignant neoplasm of perianal skin93956001
- Malignant melanoma of perineum188054000
- Cancer anal melanoma276821000
- Malignant melanoma of anus276821000
- Carcinoma of anal canal285310000
- Cancer of anal canal363352004
- Malignant neoplasm of anal canal363352004
- Malignant tumor of anal canal363352004
- Malignant tumour of anal canal363352004
- Perianal Paget disease403947009
- Perianal Paget's disease403947009
- Adenocarcinoma of anus423607006
- Adenocarcinoma of anorectum447886005
- Anorectal adenocarcinoma447886005
- Primary squamous cell carcinoma of anal canal722542000
- Primary malignant melanoma of anal canal722543005
- Primary squamous cell carcinoma of anus723265000
- Primary malignant melanoma of anus723281005
- Adenocarcinoma of anal canal764845008
- Primary carcinoma of anal canal1259431008
- Primary perianal Paget disease1259790005
- Primary perianal Paget's disease1259790005
- Primary Paget disease of anal canal1259796004
- Primary Paget's disease of anal canal1259796004
- Primary extramammary Paget disease of skin1268956001
- Primary extramammary Paget's disease of skin1268956001
- Paget disease of anal canal236811000119101
- Pagets disease of anal canal236811000119101
UMLS
- Anal canal cancerC0153445
- Anal canal cancer NOSC0153445
- Anal canal neoplasms malignantC0153445
- Cancer of anal canalC0153445
- Malignant Neoplasm of Anal CanalC0153445
- Malignant neoplasm of anal canalC0153445
- Malignant neoplasm of anal canal (disorder)C0153445
- Malignant tumor of anal canalC0153445
- Malignant tumour of anal canalC0153445
- Malignant neoplasm of anal sphincterC0864874
Clinical Terms
- Malignant melanoma of perineum
- Primary perianal Paget disease
- Adenocarcinoma of anorectum
- Anorectal adenocarcinoma
- Primary Paget disease of anal canal
- Malignant neoplasm of anal sphincter
- Malignant neoplasm of anal canal (disorder)
- Primary malignant melanoma of anal canal
- Adenocarcinoma of anal canal
- Primary extramammary Paget's disease of skin
- Primary malignant melanoma of anus
- Perianal Paget's disease
- Cancer of anal canal
- Cancer anal melanoma
- Malignant tumour of anal canal
- Primary malignant neoplasm of perianal skin
- Adenocarcinoma of anus
- Primary squamous cell carcinoma of anus
- Primary Paget's disease of anal canal
- Anal canal cancer
- Paget disease of anal canal
- Anal canal neoplasms malignant
- Pagets disease of anal canal
- Perianal Paget disease
- Malignant melanoma of anus
- Primary malignant neoplasm of anal canal
- Primary squamous cell carcinoma of anal canal
- Anal canal cancer NOS
- Primary perianal Paget's disease
- Carcinoma of anal canal
- Primary extramammary Paget disease of skin
- Primary carcinoma of anal canal
- Malignant tumor of anal canal
Frequently Asked Questions
What is the ICD-10 code for malignant neoplasm of anal canal?
The ICD-10-CM code for malignant neoplasm of anal canal is C21.1. The full clinical description is "Malignant neoplasm of anal canal". C21.1 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code C21.1 mean?
ICD-10-CM code C21.1 represents “Malignant neoplasm of anal canal”. It is classified under Chapter 2: Neoplasms and is a billable/specific code that can be used on a claim.
Is C21.1 a billable code?
Yes, C21.1 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is C21.1 in?
C21.1 is in Chapter 2: Neoplasms (codes C00-D49).
What codes cannot be used with C21.1?
C21.1 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 C21.1 map to?
C21.1 maps to 19 SNOMED CT concepts: 764845008, 447886005, 423607006, 276821000, 363352004, and 14 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for C21.1?
C21.1 is linked to 2 UMLS Concept Unique Identifiers: C0153445, C0864874. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does C21.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like malignant neoplasm of 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 C21.1?
C21.1 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.