C21.0 MALIGNANT NEOPLASM OF ANUS, UNSPECIFIED

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Code Information

Diagnosis Code: C21.0

Short Description: Malignant neoplasm of anus, unspecified

Long Description: Malignant neoplasm of anus, unspecified

The code C21.0 is VALID for claim submission

Code Classification:

Neoplasms (C00–D49)
- Malignant neoplasms of digestive organs (C15-C26)
  - Malignant neoplasm of anus and anal canal (C21)
    - C21.0 Malignant neoplasm of anus, unspecified

Code Version: 2022 ICD-10-CM

Synonyms

Adenocarcinoma of anus
Anorectal adenocarcinoma
Anorectal adenocarcinoma
Carcinoma of anus
Lymphoma of anus
Malignant mesenchymal neoplasm of anus
Malignant neoplasm of rectum, rectosigmoid junction and anus
Malignant tumor of anus
Malignant tumor of rectosigmoid junction
Primary adenocarcinoma of anus
Primary malignant mesenchymal neoplasm of anus
Primary malignant neoplasm of anus
Primary sarcoma of perineum
Primary squamous cell carcinoma of anus

Diagnostic Related Group(s)

The code C21.0 is grouped in the following Diagnostic Related Group(s) (MS-DRG v39.0)

Digestive Malignancy With Mcc (374)
Digestive Malignancy With Cc (375)
Digestive Malignancy Without Cc/mcc (376)

Crosswalk Information

ICD-10 Code		ICD-9 Code	ICD-9 Description
C21.0		154.3	Malignant neo anus NOS

This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

Similar Codes

ICD-10 Code	ICD-10 Description
C21	Malignant neoplasm of anus and anal canal
C21.1	Malignant neoplasm of anal canal
C21.2	Malignant neoplasm of cloacogenic zone
C21.8	Malignant neoplasm of overlapping sites of rectum, anus and anal canal

This page was last updated on: 10/1/2023

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