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v1.0.0
ICD-10 Guide
ICD-10 CodesC78.0

C78.0

Billable

Secondary malignant neoplasm of lung

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

Code Description

ICD-10 C78.0 is a billable code used to indicate a diagnosis of secondary malignant neoplasm of lung.

Key Diagnostic Point:

C78.0 refers to secondary malignant neoplasms of the lung, which are metastatic tumors that have spread to the lung from a primary cancer located elsewhere in the body. This condition is characterized by the presence of malignant cells in the lung tissue, originating from various primary sites such as breast, colon, kidney, or melanoma. The diagnosis of secondary lung cancer often occurs when patients present with respiratory symptoms, imaging studies reveal lung nodules or masses, and a thorough investigation identifies the primary malignancy. Staging of metastatic lung cancer is crucial for treatment planning and prognosis, typically classified using the TNM system, which assesses tumor size, lymph node involvement, and the presence of distant metastases. Palliative care considerations are paramount, as many patients with secondary lung neoplasms may have advanced disease, necessitating a focus on symptom management, quality of life, and supportive care rather than curative treatment. Accurate coding of C78.0 requires comprehensive documentation of the primary cancer, staging details, and any palliative interventions provided.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Need for accurate identification of the primary cancer site
  • Staging requirements for metastatic disease
  • Differentiation between primary lung cancer and secondary lung neoplasms
  • Documentation of palliative care measures

Audit Risk Factors

  • Inadequate documentation of the primary cancer site
  • Failure to document staging information
  • Misclassification of primary vs. secondary lung neoplasms
  • Lack of clarity in palliative care documentation

Specialty Focus

Medical Specialties

Oncology

Documentation Requirements

Detailed documentation of the primary cancer diagnosis, staging, and treatment plan.

Common Clinical Scenarios

Patients presenting with lung metastases from breast or colorectal cancer.

Billing Considerations

Ensure clear documentation of the primary site and any treatments received.

Pulmonology

Documentation Requirements

Thorough respiratory assessments and imaging results.

Common Clinical Scenarios

Patients with respiratory symptoms and known history of cancer.

Billing Considerations

Document any lung function tests and symptom management strategies.

Coding Guidelines

Inclusion Criteria

Use C78.0 When
  • According to official coding guidelines, C78
  • 0 should be used when the lung is confirmed as a site of metastasis from a known primary malignancy
  • Coders must ensure that the primary site is documented and that the metastatic nature of the lung neoplasm is clear

Exclusion Criteria

Do NOT use C78.0 When
  • Exclusion criteria include cases where the lung neoplasm is primary rather than secondary

Related ICD-10 Codes

Related CPT Codes

99214CPT Code

Established patient office visit, level 4

Clinical Scenario

Used for follow-up visits in patients with secondary lung neoplasms.

Documentation Requirements

Document history, examination findings, 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 cancer registries and treatment planning. C78.0 provides a clear distinction between secondary lung neoplasms and primary lung cancers, which is crucial for 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 cancer registries and treatment planning. C78.0 provides a clear distinction between secondary lung neoplasms and primary lung cancers, which is crucial for patient management.

Reimbursement & Billing Impact

reimbursement.

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 difference between primary and secondary lung cancer?

Primary lung cancer originates in the lung tissue, while secondary lung cancer refers to cancer that has spread to the lung from another primary site. Accurate coding requires identifying the primary site.