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v1.0.0
ICD-10 Guide
DiagnosesMetastatic Colon Cancer

Metastatic Colon Cancer

ICD-10 Coding for Metastatic Colon Cancer(C18.9, C78.7)

PRIMARY SPECIALTYOncology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Metastatic Colon Cancer?
Essential facts and insights about Metastatic Colon Cancer

Key Clinical Considerations:

  • Abdominal pain or discomfort
  • Unexplained weight loss
  • Changes in bowel habits (diarrhea or constipation)
  • Key diagnostic tests: Colonoscopy, CT scan, MRI
  • Physical exam findings: Palpable abdominal mass, hepatomegaly

Clinical Information

Clinical Criteria & Documentation Requirements

  • Required documentation elements: Patient history, imaging results, biopsy reports
  • Specific coding terminology: Metastatic, stage IV, colon cancer
  • Documentation examples: 'Patient diagnosed with metastatic colon cancer to liver based on biopsy results.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Use specific codes for metastatic sites; Common errors: Misclassifying primary site or stage.

Code Exclusions

Important Exclusions

  • Excluded conditions: Non-malignant colon conditions; Alternative codes: Codes for localized colon cancer.

Related ICD-10 Codes

Primary Codes
C18.9
Malignant neoplasm of colon, unspecified
C78.00
Secondary malignant neoplasm of unspecified site
Ancillary Codes
Z51.11
D64.81
Differential Codes
C19
C19
if the tumor is located at the rectosigmoid junction.
C22.0
C22.0
for primary liver cancer, not metastasis.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Oncology

Specialty Applications

  • Patient populations: Adults with diagnosed colon cancer; Clinical settings: Oncology clinics, hospitals.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Complete patient history, imaging studies, and pathology reports are essential.

Billing considerations?

Ensure accurate coding to reflect metastatic status for appropriate reimbursement.