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v1.0.0
ICD-10 Guide
ICD-10 CodesC79.8

C79.8

Billable

Secondary malignant neoplasm of other specified sites

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

Code Description

ICD-10 C79.8 is a billable code used to indicate a diagnosis of secondary malignant neoplasm of other specified sites.

Key Diagnostic Point:

C79.8 refers to secondary malignant neoplasms that arise in sites not specifically classified under other codes. These neoplasms are metastatic tumors that have spread from a primary cancer site to other organs or tissues. The identification of a secondary malignant neoplasm is crucial for treatment planning and prognosis. Patients may present with symptoms related to the metastatic site, such as pain, organ dysfunction, or systemic symptoms like weight loss and fatigue. The unknown primary tumor (UPT) scenario is common in metastatic disease, where the origin of the cancer cannot be determined despite extensive diagnostic workup. Staging of metastatic disease is essential for treatment decisions, often utilizing the TNM (Tumor, Node, Metastasis) classification system. Palliative care considerations are paramount, focusing on symptom management and quality of life, especially in advanced stages where curative treatment is no longer an option. Accurate coding of C79.8 is vital for appropriate reimbursement and reflects the complexity of managing patients with metastatic cancer.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Determining the primary site when it is unknown
  • Differentiating between multiple metastatic sites
  • Staging complexities associated with metastatic disease
  • Documentation of palliative care considerations

Audit Risk Factors

  • Inadequate documentation of the primary site
  • Failure to document staging details
  • Misclassification of metastatic sites
  • Lack of clarity in palliative care documentation

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 metastatic lesions.

Billing Considerations

Ensure that all metastatic sites are documented and that the primary site is clearly identified or noted as unknown.

Palliative Care

Documentation Requirements

Comprehensive symptom management plans and goals of care discussions.

Common Clinical Scenarios

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

Billing Considerations

Focus on quality of life and symptom management, ensuring that documentation reflects the patient's needs and treatment goals.

Coding Guidelines

Inclusion Criteria

Use C79.8 When
  • According to ICD
  • 10 coding guidelines, C79
  • 8 should be used when a secondary malignant neoplasm is documented without a specified site
  • Coders must ensure that the documentation supports the diagnosis and that all relevant clinical details are included

Exclusion Criteria

Do NOT use C79.8 When
No specific exclusions found.

Related ICD-10 Codes

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 the patient's history, examination findings, and treatment plan.

Specialty Considerations

Oncology specialists should ensure that all aspects of the patient's cancer history are included.

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. C79.8 provides a mechanism to capture secondary malignancies that do not fit neatly into other categories, reflecting the complexity of cancer care.

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. C79.8 provides a mechanism to capture secondary malignancies that do not fit neatly into other categories, reflecting the complexity of cancer care.

Reimbursement & Billing Impact

reimbursement processes. C79.8 provides a mechanism to capture secondary malignancies that do not fit neatly into other categories, reflecting the complexity of cancer care.

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 C79.8?

Coding C79.8 is significant as it captures the complexity of metastatic disease, allowing for appropriate treatment planning and reimbursement. It reflects the need for comprehensive documentation of the patient's cancer history and current status.