Diagnosis Code

C21.1 MALIGNANT NEOPLASM OF ANAL CANAL


Code Information

Diagnosis Code: C21.1

Short Description: Malignant neoplasm of anal canal

Long Description: Malignant neoplasm of anal canal

The code C21.1 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)
        • C21.1 Malignant neoplasm of anal canal

Code Version: 2022 ICD-10-CM


Synonyms

  • Adenocarcinoma of anal canal
  • Adenocarcinoma of anus
  • Anorectal adenocarcinoma
  • Carcinoma of anal canal
  • Malignant melanoma of anus
  • Malignant melanoma of perineum
  • Malignant tumor of anal canal
  • Paget disease of anal canal
  • Perianal Paget's disease
  • Perianal Paget's disease
  • Primary carcinoma of anal canal
  • Primary malignant melanoma of anal canal
  • Primary malignant melanoma of anus
  • Primary malignant neoplasm of anal canal
  • Primary malignant neoplasm of perianal skin
  • Primary Paget disease of anal canal
  • Primary perianal Paget disease
  • Primary squamous cell carcinoma of anal canal
  • Primary squamous cell carcinoma of anus

Diagnostic Related Group(s)

The code C21.1 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)

References to Index of Diseases and Injuries

The code C21.1 has the following ICD-10-CM references to the Index of Diseases and Injuries
  • Inclusion Terms:
    • Malignant neoplasm of anal sphincter

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
C21.1 Right Arrow 154.2 Malig neopl anal canal

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
C21.0 Malignant neoplasm of anus, unspecified
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