What is the ICD-10 code for rectal carcinoma?

The ICD-10 code for rectal carcinoma is C20, which is used for malignant neoplasm of the rectum.

How do you code metastatic rectal cancer?

For metastatic rectal cancer, use C78.5 to indicate secondary malignant neoplasm of the rectum, alongside the primary site code.

ICD-10 Coding for Rectal Carcinoma(C20, C78.5, C21.1)

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Learn about ICD-10 coding for rectal carcinoma, including primary and metastatic codes, documentation requirements, and common pitfalls.

Also known as:

Rectal CancerRectal Adenocarcinoma

Related ICD-10 Code Ranges

Complete code families applicable to Rectal Carcinoma

C00-D49Primary Range

Neoplasms

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
C20	Malignant neoplasm of rectum	Use when the primary tumor is located within the rectum.	Biopsy-proven adenocarcinoma Imaging confirming tumor location within rectum
C19	Malignant neoplasm of rectosigmoid junction	Use when the tumor is located at the rectosigmoid junction.	Biopsy-proven adenocarcinoma Imaging showing tumor at rectosigmoid junction
C78.5	Secondary malignant neoplasm of large intestine and rectum	Use when there is metastatic disease to the rectum from another primary site.	Imaging or biopsy confirming metastasis to rectum

Primary ICD-10-CM Codes

Malignant neoplasm of rectum

C20Billable

Secondary malignant neoplasm of large intestine and rectum

C78.5Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Malignant neoplasm of rectosigmoid junctionC19

Malignant neoplasm of rectumC20

Documentation & Coding Risks

Avoid these common issues when documenting Rectal Carcinoma.

Using non-specific terms like 'rectal mass'

Impact

Clinical: May lead to inappropriate treatment decisions., Regulatory: Fails to meet documentation standards., Financial: Potential for denied claims due to lack of specificity.

Mitigation

Use specific terms like 'adenocarcinoma', Confirm with biopsy results

Confusing rectal cancer with colon cancer codes

Impact

Reimbursement: Incorrect coding may lead to denied claims., Compliance: Non-compliance with ICD-10 coding guidelines., Data Quality: Inaccurate cancer registry data.

Mitigation

Verify tumor location and use C20 for rectal cancer.

Omitting metastatic sites in coding

Impact

Reimbursement: Potential underpayment for complex cases., Compliance: Failure to meet coding standards., Data Quality: Incomplete patient records.

Mitigation

Always code secondary sites when metastasis is present.

Metastasis Documentation

Impact

Failure to document and code metastatic sites accurately.

Mitigation

Implement a checklist for metastatic site documentation.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with C20.

Primary Code

C20

Malignant neoplasm of rectum

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ICD-10 codes4

Coding risks4

FAQs2

ICD-10 Coding for Rectal Carcinoma(C20, C78.5, C21.1)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for rectal carcinoma?

How do you code metastatic rectal cancer?

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