Malignant neoplasm of anus, unspecified
- C21.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2024 edition of ICD-10-CM C21.0 became effective on October 1, 2023.
- This is the American ICD-10-CM version of C21.0 – other international versions of ICD-10 C21.0 may differ.
The following code(s) above C21.0 contain annotation back-references
that may be applicable to C21.0:
- C00-D49 Neoplasms
- C15-C26 Malignant neoplasms of digestive organs
- C21 Malignant neoplasm of anus and anal canal
Approximate Synonyms
- Cancer anal melanoma
- Cancer of the anus
- Cancer of the anus, adenocarcinoma
- Cancer of the anus, squamous cell
- Malignant melanoma of anus
- Primary adenocarcinoma of anus
- Primary malignant neoplasm of anus
- Squamous cell carcinoma of anal margin
Clinical Information
- A primary or metastatic malignant neoplasm that affects the anal canal or perianal skin. Representative examples include carcinomas, lymphomas, and melanomas.
- Cancer relating to the anus. Tumors of the anal margin (below the anal verge and involving the perianal hair-bearing skin) are classified with skin tumors.
ICD-10-CM C21.0 is grouped within Diagnostic Related Group(s) (MS-DRG v41.0):
- 374 Digestive malignancy with mcc
- 375 Digestive malignancy with cc
- 376 Digestive malignancy without cc/mcc
Convert C21.0 to ICD-9-CMCode History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
- 2024 (effective 10/1/2023): No change
Code annotations containing back-references to C21.0:
Diagnosis Index entries containing back-references to C21.0:
- Paget’s disease
- extramammary – see also Neoplasm, skin, malignant
- anus C21.0
- extramammary – see also Neoplasm, skin, malignant