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v1.0.0
ICD-10 Guide
ICD-10 CodesChapter 2: NeoplasmsC77

C77

Billable

Secondary and unspecified malignant neoplasm of lymph nodes

Chapter 2:Neoplasms

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

Code Description

ICD-10 C77 is a billable code used to indicate a diagnosis of secondary and unspecified malignant neoplasm of lymph nodes.

Key Diagnostic Point:

C77 refers to secondary malignant neoplasms of lymph nodes, which occur when cancer cells spread from a primary tumor to the lymphatic system. This code encompasses metastatic disease where the origin of the primary tumor is unknown or unspecified. The lymphatic system plays a crucial role in the body's immune response, and when malignant cells infiltrate lymph nodes, it can indicate advanced disease. Patients may present with swollen lymph nodes, systemic symptoms like fever or weight loss, and may require imaging studies for diagnosis. Staging of metastatic lymph node involvement is critical for treatment planning and prognosis. Palliative care considerations are paramount, as many patients with C77 may have advanced cancer requiring symptom management and supportive care rather than curative treatment. Accurate coding is essential for appropriate reimbursement and care management.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Determining the primary site of cancer can be challenging.
  • Differentiating between primary and secondary lymph node involvement.
  • Staging requirements may vary based on the extent of disease.
  • Documentation must clearly indicate the metastatic nature of the disease.

Audit Risk Factors

  • Inadequate documentation of the primary cancer site.
  • Failure to specify whether the lymph node involvement is metastatic.
  • Misclassification of lymph node involvement as primary.
  • Lack of staging information in the medical record.

Specialty Focus

Medical Specialties

Oncology

Documentation Requirements

Detailed history of the primary cancer, staging information, and treatment plans.

Common Clinical Scenarios

Patients with known primary cancers presenting with lymphadenopathy.

Billing Considerations

Ensure clear documentation of metastatic disease and any palliative care measures.

Palliative Care

Documentation Requirements

Focus on symptom management, patient goals, and quality of life considerations.

Common Clinical Scenarios

Patients with advanced cancer requiring symptom relief and support.

Billing Considerations

Documentation should reflect the patient's wishes and treatment preferences.

Coding Guidelines

Inclusion Criteria

Use C77 When
  • Follow official ICD
  • CM coding guidelines, ensuring accurate documentation of the metastatic nature of the disease
  • Include staging information when available and ensure that the primary site is documented if known

Exclusion Criteria

Do NOT use C77 When
No specific exclusions found.

Related CPT Codes

38500CPT Code

Biopsy of lymph nodes

Clinical Scenario

Used when lymph node involvement is suspected and requires histological confirmation.

Documentation Requirements

Document the reason for biopsy and findings.

Specialty Considerations

Oncology specialists should ensure clear documentation of the biopsy results.

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 cancer registries and treatment planning.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of metastatic diseases, improving the accuracy of cancer registries and treatment planning.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of metastatic diseases, improving the accuracy of cancer registries and treatment planning.

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 C77?

Coding C77 accurately reflects the presence of metastatic disease in lymph nodes, which is crucial for treatment planning and prognosis. It also impacts reimbursement and quality of care metrics.