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ICD-10 Guide
DiagnosesAdenocarcinoma Of Sigmoid Colon

Adenocarcinoma Of Sigmoid Colon

ICD-10 Coding for Adenocarcinoma of Sigmoid Colon(C18.7)

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

Diagnosis Overview

What is Adenocarcinoma Of Sigmoid Colon?
Essential facts and insights about Adenocarcinoma of Sigmoid Colon

Key Clinical Considerations:

  • Patients may present with symptoms such as abdominal pain, changes in bowel habits, rectal bleeding, or unexplained weight loss.
  • Laboratory findings may include anemia, elevated carcinoembryonic antigen (CEA) levels, and abnormal liver function tests.
  • Physical examination may reveal abdominal tenderness, palpable masses, or signs of bowel obstruction.
  • Imaging studies such as CT scans or colonoscopy may show masses, lesions, or obstruction in the sigmoid colon.
  • Staging is determined using the TNM classification, assessing tumor size (T), lymph node involvement (N), and metastasis (M).

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must include a clear diagnosis of adenocarcinoma of the sigmoid colon, supported by clinical findings.
  • Specific terminology such as 'adenocarcinoma', 'sigmoid colon', and 'staging' must be documented.
  • Examples include: 'Patient diagnosed with adenocarcinoma of the sigmoid colon based on biopsy results.'
  • Documentation must demonstrate medical necessity for procedures and treatments related to the diagnosis.
  • Quality measures may include documentation of staging, treatment plans, and follow-up care.

Coding Guidelines

Usage Guidelines & Examples

  • Use this diagnosis code when a patient has a confirmed diagnosis of adenocarcinoma of the sigmoid colon.
  • Do not use this code for benign tumors or other types of colorectal cancer such as squamous cell carcinoma.
  • Similar codes include C18.6 (Adenocarcinoma of the descending colon) and C18.9 (Malignant neoplasm of colon, unspecified).
  • Common errors include coding based on symptoms alone without a confirmed diagnosis; ensure biopsy results are documented.
  • In complex cases, consider the patient's overall clinical picture and any co-existing conditions that may affect coding.

Code Exclusions

Important Exclusions

  • Conditions explicitly excluded include benign tumors of the colon and other types of colorectal cancer.
  • Alternative codes for excluded conditions include D12.6 (Benign neoplasm of sigmoid colon) for benign tumors.
  • Conditions are excluded to ensure accurate representation of malignant disease for treatment and reimbursement.
  • Common mistakes include misclassifying benign conditions as malignant; verify pathology reports.
  • Related but distinct conditions include colorectal polyps and other gastrointestinal malignancies.

Related ICD-10 Codes

Primary Codes
C18.7
Adenocarcinoma of sigmoid colon
C18.9
Malignant neoplasm of colon, unspecified
Ancillary Codes
Z85.038
Differential Codes
C19
C19
if the tumor is located at the rectosigmoid junction, not purely in the sigmoid colon.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pathology

Specialty Applications

  • This diagnosis applies to patients with confirmed adenocarcinoma of the sigmoid colon.
  • Patient populations include adults, with increased risk in those over 50, smokers, and those with a family history of colorectal cancer.
  • Clinical settings include inpatient hospital admissions for surgery, outpatient oncology clinics, and emergency departments for complications.
  • Specialty-specific applications are relevant in oncology, gastroenterology, and surgical specialties.
  • Treatment contexts include surgical resection, chemotherapy, and radiation therapy.

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

Template 1

Template: 'Patient diagnosed with adenocarcinoma of sigmoid colon based on biopsy results.'

Template 2

Template: 'Clinical presentation consistent with adenocarcinoma including abdominal pain and weight loss.'

Template 3

Template: 'Diagnostic criteria met as evidenced by imaging and pathology findings.'

Template 4

Template: 'Treatment plan initiated for adenocarcinoma with surgical resection and chemotherapy.'

Template 5

Template: 'Follow-up care for adenocarcinoma including monitoring for recurrence and side effects of treatment.'

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

What documentation is required for this diagnosis?

Documentation must include biopsy results, clinical findings, and staging information.

How does this differ from similar diagnoses?

Adenocarcinoma is a specific type of cancer arising from glandular tissue, while other types may arise from different cell types.

What are common billing considerations?

Ensure that all procedures related to the diagnosis are medically necessary and well-documented to optimize claims.

What procedures are typically associated?

Common procedures include colonoscopy, surgical resection, and chemotherapy administration.

Are there any quality reporting implications?

Quality measures may include adherence to treatment guidelines and documentation of follow-up care.