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v1.0.0
ICD-10 Guide
ICD-10 CodesChapter 2: NeoplasmsC78

C78

Billable

Secondary malignant neoplasm of respiratory and digestive organs

Chapter 2:Neoplasms

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

Code Description

ICD-10 C78 is a billable code used to indicate a diagnosis of secondary malignant neoplasm of respiratory and digestive organs.

Key Diagnostic Point:

C78 refers to secondary malignant neoplasms that have metastasized to the respiratory and digestive organs from a primary site elsewhere in the body. This code encompasses a variety of metastatic cancers that affect organs such as the lungs, pleura, liver, pancreas, and gastrointestinal tract. The presence of secondary malignancies indicates that the cancer has spread beyond its original site, which can complicate treatment and management. Patients may present with symptoms related to the affected organs, such as respiratory distress, abdominal pain, or gastrointestinal bleeding. Accurate coding is crucial for appropriate treatment planning, staging, and palliative care considerations. Staging of metastatic disease is essential for determining prognosis and treatment options, as well as for clinical trials. In cases where the primary tumor is unknown, thorough investigation is necessary to identify the source of metastasis, which can influence management strategies. Palliative care is often a significant aspect of treatment for patients with secondary malignancies, focusing on symptom relief and quality of life.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Determining the primary site of cancer when unknown
  • Differentiating between primary and secondary malignancies
  • Staging considerations for metastatic disease
  • Documentation of symptoms and treatment plans

Audit Risk Factors

  • Inadequate documentation of the primary site
  • Failure to document staging details
  • Misclassification of primary vs. secondary malignancy
  • Lack of comprehensive treatment plans in records

Specialty Focus

Medical Specialties

Oncology

Documentation Requirements

Detailed history of cancer diagnosis, treatment history, and staging information.

Common Clinical Scenarios

Patients with known primary cancers presenting with new symptoms related to respiratory or digestive organs.

Billing Considerations

Ensure accurate documentation of metastasis and any treatments administered.

Palliative Care

Documentation Requirements

Comprehensive symptom management plans and patient goals of care.

Common Clinical Scenarios

Patients with advanced metastatic disease requiring symptom relief and end-of-life care.

Billing Considerations

Focus on quality of life and symptom management documentation.

Coding Guidelines

Inclusion Criteria

Use C78 When
  • According to ICD
  • 10 coding guidelines, C78 should be used when there is clear documentation of secondary malignancy affecting the respiratory or digestive organs
  • Coders must ensure that the primary malignancy is documented if known, and that staging information is included when applicable

Exclusion Criteria

Do NOT use C78 When
No specific exclusions found.

Related CPT Codes

99214CPT Code

Established patient office visit, level 4

Clinical Scenario

Used for follow-up visits for patients with metastatic disease.

Documentation Requirements

Document history of present illness, review of systems, and treatment plan.

Specialty Considerations

Oncology specialists should ensure comprehensive documentation of cancer history.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of secondary malignancies, improving the accuracy of data collection and reimbursement processes. C78 provides a more detailed classification for metastatic disease, which can enhance treatment planning and patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of secondary malignancies, improving the accuracy of data collection and reimbursement processes. C78 provides a more detailed classification for metastatic disease, which can enhance treatment planning and patient management.

Reimbursement & Billing Impact

reimbursement processes. C78 provides a more detailed classification for metastatic disease, which can enhance treatment planning and patient management.

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 importance of documenting the primary site of cancer?

Documenting the primary site is crucial for accurate coding, treatment planning, and understanding the patient's overall prognosis. It also helps in distinguishing between primary and secondary malignancies, which can affect treatment decisions.