ICD-10 Diagnosis Code C21.0

Malignant neoplasm of anus, unspecified

Diagnosis Code C21.0

ICD-10: C21.0
Short Description: Malignant neoplasm of anus, unspecified
Long Description: Malignant neoplasm of anus, unspecified
This is the 2019 version of the ICD-10-CM diagnosis code C21.0

Valid for Submission
The code C21.0 is valid for submission for HIPAA-covered transactions.

Code Classification
  • Neoplasms (C00–D48)
    • Malignant neoplasms of digestive organs (C15-C26)
      • Malignant neoplasm of anus and anal canal (C21)
Version 2019 Billable Code Neoplasm Malignant Primary

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code C21.0 is grouped in the following Diagnostic Related Group(s) (MS-DRG V35.0)

  • 374 - DIGESTIVE MALIGNANCY WITH MCC
  • 375 - DIGESTIVE MALIGNANCY WITH CC
  • 376 - DIGESTIVE MALIGNANCY WITHOUT CC/MCC

Convert to ICD-9
  • 154.3 - Malignant neo anus NOS

Synonyms
  • Adenocarcinoma of anus
  • Anorectal adenocarcinoma
  • Carcinoma of anus
  • Malignant neoplasm of rectum, rectosigmoid junction and anus
  • Malignant tumor of anus
  • Malignant tumor of anus and anal canal
  • Primary adenocarcinoma of anus
  • Primary malignant neoplasm of anus
  • Primary squamous cell carcinoma of anus

Index to Diseases and Injuries
References found for the code C21.0 in the Index to Diseases and Injuries:


Table of Neoplasms

The code C21.0 is included in the table of neoplasms by anatomical site. For each site there are six possible code numbers according to whether the neoplasm in question is malignant, benign, in situ, of uncertain behavior, or of unspecified nature. The description of the neoplasm will often indicate which of the six columns is appropriate.

Where such descriptors are not present, the remainder of the Index should be consulted where guidance is given to the appropriate column for each morphological (histological) variety listed. However, the guidance in the Index can be overridden if one of the descriptors mentioned above is present.

The Tabular must be reviewed for the complete diagnosis code.

Neoplasm, neoplastic Malignant
Primary
Malignant
Secondary
CaInSitu Benign Uncertain
Behavior
Unspecified
Behavior
»anus, anal
C21.0C78.5D01.3D12.9D37.8D49.0

Information for Patients


Anal Cancer

The anus is where stool leaves your body when you go to the bathroom. It is made up of your outer layers of skin and the end of your large intestine. Anal cancer is a disease in which cancer cells form in the tissues of the anus.

Anal cancer is rare. It is more common in smokers and people over 50. You are also at higher risk if you have HPV, have anal sex, or have many sexual partners.

Symptoms include bleeding, pain, or lumps in the anal area. Anal itching and discharge can also be signs of anal cancer.

Doctors use tests that examine the anus to diagnose anal cancer. They include a physical exam, endoscopy, ultrasound, and biopsy.

Treatments include radiation therapy, chemotherapy, and surgery.

NIH: National Cancer Institute

  • After chemotherapy - discharge (Medical Encyclopedia)
  • Anal cancer (Medical Encyclopedia)
  • Anoscopy (Medical Encyclopedia)
  • Pelvic (between the hips) radiation - discharge (Medical Encyclopedia)
  • Understanding Chemotherapy - NIH - Easy-to-Read (National Cancer Institute)
  • What to Know about External Beam Radiation Therapy - NIH - Easy-to-Read (National Cancer Institute)

[Read More]

ICD-10 Footnotes

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
  • No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
  • Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.

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