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Home/Diagnosis/ICD-10 Coding for Malignant Neoplasm of Anus

ICD-10 Coding for Malignant Neoplasm of Anus

C21.0
C21.1
C21.2

Complete ICD-10-CM coding and documentation guide for icd-10 coding for malignant neoplasm of anus includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Anal Cancer
Cancer of the Anus
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Key Information: ICD-10 Coding for Malignant Neoplasm of Anus

Essential facts and insights about ICD-10 Coding for Malignant Neoplasm of Anus

Use ICD-10 code C21.0 for malignant neoplasm of anus, unspecified, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Malignant neoplasm of anus, unspecified

Billable Code
C21.0
Billable

Diagnostic Criteria

clinical:
  • • Documentation lacks specific site or histology

Applicable To

  • • Unspecified anal malignancy

Important Notes

  • • Ensure documentation specifies 'anus' to avoid confusion with rectal cancer.

Malignant neoplasm of anal canal

Billable Code
C21.1
Billable

Diagnostic Criteria

clinical:
  • • Histological confirmation of basal cell carcinoma in the anal canal

Applicable To

  • • Basal cell carcinoma of anal margin

Important Notes

  • • Ensure histology is confirmed as basal cell carcinoma.

Malignant neoplasm of cloacogenic zone

Billable Code
C21.2
Billable

Diagnostic Criteria

clinical:
  • • Histological confirmation of carcinoma in the cloacogenic zone

Applicable To

  • • Transitional zone carcinoma

Important Notes

  • • Ensure documentation specifies cloacogenic zone involvement.

Malignant neoplasm of overlapping sites of anus

Billable Code
C21.8
Billable

Diagnostic Criteria

clinical:
  • • Documentation of tumor involving both anus and rectum

Applicable To

  • • Tumor involving anus and rectum

Important Notes

  • • Ensure documentation clearly indicates overlapping site involvement.
Frequently Asked Questions

What is the ICD-10 code for malignant neoplasm of anus?

The ICD-10 code for malignant neoplasm of anus is C21.0 for unspecified cases, with specific codes like C21.1 for anal canal and C21.2 for cloacogenic zone.

How is anal cancer documented for coding?

Anal cancer documentation should include tumor location, size, histological type, and margin status to ensure accurate coding.

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