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ICD-10 Guide
ICD-10 CodesC78.5

C78.5

Billable

Secondary malignant neoplasm of large intestine and rectum

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 C78.5 is a billable code used to indicate a diagnosis of secondary malignant neoplasm of large intestine and rectum.

Key Diagnostic Point:

C78.5 refers to secondary malignant neoplasms that have metastasized to the large intestine and rectum from a primary cancer site. This condition indicates that cancer cells have spread from their original location to the colorectal region, which can complicate treatment and management. The large intestine includes the cecum, colon, and rectum, and the presence of metastatic disease in these areas often signifies advanced cancer. Patients may present with symptoms such as abdominal pain, changes in bowel habits, rectal bleeding, or unexplained weight loss. The identification of a secondary malignant neoplasm typically requires imaging studies, such as CT scans or MRIs, and may involve biopsies to confirm the metastatic nature of the disease. Staging of the disease is crucial for determining the extent of metastasis and guiding treatment options, which may include chemotherapy, radiation therapy, or palliative care. In cases where the primary tumor is unknown, thorough investigation is necessary to identify the source of the malignancy, as this can significantly influence treatment decisions and prognosis.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Determining the primary site of cancer can be challenging.
  • Staging of metastatic disease requires comprehensive documentation.
  • Differentiating between primary and secondary tumors in the large intestine.
  • Palliative care considerations may complicate coding.

Audit Risk Factors

  • Inadequate documentation of the primary cancer site.
  • Failure to document staging details.
  • Misclassification of primary versus secondary tumors.
  • Lack of clarity in treatment plans related to palliative care.

Specialty Focus

Medical Specialties

Oncology

Documentation Requirements

Detailed documentation of the primary cancer site, staging, and treatment plans.

Common Clinical Scenarios

Patients with known primary cancers presenting with new gastrointestinal symptoms.

Billing Considerations

Ensure that all imaging and biopsy results are included in the medical record.

Gastroenterology

Documentation Requirements

Comprehensive notes on gastrointestinal symptoms, diagnostic tests, and findings.

Common Clinical Scenarios

Patients with unexplained gastrointestinal symptoms and a history of cancer.

Billing Considerations

Document any endoscopic findings that may indicate metastatic disease.

Coding Guidelines

Inclusion Criteria

Use C78.5 When
  • According to ICD
  • 10 coding guidelines, C78
  • 5 should be used when there is clear documentation of metastatic disease to the large intestine and rectum
  • Coders must ensure that the primary site of cancer is documented, and staging information is included when applicable

Exclusion Criteria

Do NOT use C78.5 When
  • Exclusion criteria include cases where the neoplasm is primary rather than secondary

Related ICD-10 Codes

Related CPT Codes

44150CPT Code

Colectomy, partial

Clinical Scenario

Performed for symptomatic relief in patients with metastatic disease.

Documentation Requirements

Operative report detailing the procedure and indication.

Specialty Considerations

Oncology and Gastroenterology must collaborate on documentation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of metastatic diseases, improving the accuracy of data collection and reimbursement processes. C78.5 provides a clear distinction for secondary malignancies, which aids in treatment planning and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of metastatic diseases, improving the accuracy of data collection and reimbursement processes. C78.5 provides a clear distinction for secondary malignancies, which aids in treatment planning and resource allocation.

Reimbursement & Billing Impact

reimbursement processes. C78.5 provides a clear distinction for secondary malignancies, which aids in treatment planning and resource allocation.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What is the significance of coding C78.5 accurately?

Accurate coding of C78.5 is crucial for appropriate treatment planning, resource allocation, and reimbursement. It ensures that patients receive the necessary care for their metastatic disease and helps healthcare providers track outcomes effectively.