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ICD-10 Guide
ICD-10 CodesC78.4

C78.4

Billable

Secondary malignant neoplasm of small intestine

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

Code Description

ICD-10 C78.4 is a billable code used to indicate a diagnosis of secondary malignant neoplasm of small intestine.

Key Diagnostic Point:

C78.4 refers to secondary malignant neoplasms of the small intestine, indicating that cancer has metastasized to this area from a primary site elsewhere in the body. This condition is often associated with advanced stages of cancer, where the primary tumor may be unknown or difficult to identify. The small intestine, comprising the duodenum, jejunum, and ileum, can be affected by various types of cancers, including those originating from the breast, lung, or colon. Symptoms may include abdominal pain, obstruction, weight loss, and gastrointestinal bleeding. Diagnosis typically involves imaging studies such as CT scans, MRIs, or endoscopic procedures, alongside histopathological examination of biopsies. Staging of metastatic disease is crucial for treatment planning and may involve the use of the TNM classification system, which assesses tumor size, lymph node involvement, and distant metastasis. Palliative care considerations are essential, focusing on symptom management and improving quality of life, especially in cases where curative treatment is not feasible.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Determining the primary site of cancer can be challenging.
  • Need for accurate staging and assessment of metastatic spread.
  • Documentation must clearly indicate the secondary nature of the neoplasm.
  • Differentiating between primary and secondary tumors in the small intestine.

Audit Risk Factors

  • Inadequate documentation of the primary cancer site.
  • Failure to document staging information.
  • Misclassification of primary versus secondary tumors.
  • Inconsistent coding of metastatic disease.

Specialty Focus

Medical Specialties

Oncology

Documentation Requirements

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

Common Clinical Scenarios

Patients with known primary cancers presenting with gastrointestinal symptoms.

Billing Considerations

Ensure clear differentiation between primary and metastatic tumors.

Gastroenterology

Documentation Requirements

Detailed reports of endoscopic findings and biopsy results.

Common Clinical Scenarios

Patients with unexplained abdominal pain and weight loss undergoing diagnostic procedures.

Billing Considerations

Document any findings that suggest metastatic disease versus benign conditions.

Coding Guidelines

Inclusion Criteria

Use C78.4 When
  • According to ICD
  • 10 coding guidelines, C78
  • 4 should be used when there is clear documentation of a secondary malignant neoplasm in the small intestine
  • It is important to ensure that the primary site is documented, and if unknown, this should be clearly stated in the medical record

Exclusion Criteria

Do NOT use C78.4 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

44160CPT Code

Laparoscopic small intestine resection

Clinical Scenario

Used for patients with obstructive symptoms due to metastatic disease.

Documentation Requirements

Operative report detailing the procedure and findings.

Specialty Considerations

Oncology and gastroenterology must coordinate on treatment plans.

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, including C78.4, which provides better data for tracking cancer prevalence and treatment outcomes.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of metastatic diseases, including C78.4, which provides better data for tracking cancer prevalence and treatment outcomes.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of metastatic diseases, including C78.4, which provides better data for tracking cancer prevalence and treatment outcomes.

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 C78.4?

Coding C78.4 is crucial for accurately representing the patient's condition of metastatic disease, which impacts treatment decisions, prognosis, and healthcare resource allocation.