C18.9
Malignant neoplasm of colon, unspecified
Neoplasms Billable
Quick Reference
Colon cancer without specification of location within colon
Clinical Information
When to Use This Code
Colon cancer without specification of location within colon
Common Clinical Scenarios
- Colon cancer diagnosis
- Colorectal cancer treatment
- Post-colonoscopy with cancer found
- Oncology management
Documentation Requirements
- Document specific location when known (ascending, transverse, descending, sigmoid)
- Record stage, grade, histology
- Note if metastatic disease present
- Specify treatment plan (surgery, chemo, radiation)
Coding Guidelines
Inclusion Terms
These terms are included in this code:
Colon cancerColorectal cancerColonic carcinoma
Exclusion Terms
Do NOT use this code for:
- Rectal cancer (C20)
- Benign colon polyps (K63.5)
- Colon carcinoma in situ (D01.0)
Coding Notes
Use site-specific codes when location documented
C18.0 cecum, C18.2 ascending, C18.7 sigmoid
Screening colonoscopy can prevent via polyp removal
Related ICD-10 Codes
Consider these related codes based on patient presentation:
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Code
C18.9
Category
Neoplasms
Billable Status
Billable
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