Summary & Overview
CPT 3384F: Colon Cancer, Stage I Diagnosis
CPT code 3384F identifies documentation that a patient aged 18 or older has been diagnosed with stage I colon cancer, defined by tumor invasion of the submucosa or muscularis propria. Nationally, accurate staging codes like 3384F are important for clinical care coordination, cancer registry reporting, quality measurement, and claims processing for oncology services. Key payers in the national landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
This publication provides a concise briefing on the clinical meaning and administrative role of CPT code 3384F. Readers will learn the code’s clinical context and typical sites of service, how it fits into oncology documentation and staging workflows, and where it intersects with billing and quality measurement. The report also summarizes available national payer coverage context and highlights gaps in the provided input where additional administrative details would normally be noted, such as common modifiers, associated taxonomies, and related ICD-10 diagnosis codes. The goal is to clarify what 3384F represents and how it is used in national billing and coding contexts for early-stage colon cancer documentation.
Billing Code Overview
CPT code 3384F documents a diagnosis of colon cancer, stage I, for patients 18 years of age or older. Stage I indicates the tumor invades the submucosa or muscularis propria, the inner layers of the colon.
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Service type: Diagnostic oncology evaluation and staging documentation
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Typical site of service: Oncology clinic or outpatient surgical/colorectal practice
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult aged 18 years or older who presents with symptoms such as rectal bleeding, change in bowel habits, unexplained iron-deficiency anemia, abdominal pain, or is found on screening/surveillance colonoscopy to have a suspicious lesion. Diagnostic evaluation includes history, physical examination, colonoscopy with biopsy, and staging workup (CT chest/abdomen/pelvis, MRI or endorectal ultrasound when indicated). When pathology confirms adenocarcinoma of the colon and the treating provider documents pathologic or clinical stage I—tumor invading the submucosa or muscularis propria—the encounter is coded with 3384F. Typical workflow: initial presentation to primary care or gastroenterology, colonoscopic diagnosis with biopsy, pathology review and staging, multidisciplinary discussion (surgical oncology, medical oncology, radiation oncology as appropriate), and documentation of stage I in the medical record for treatment planning and quality reporting. Typical site of service: outpatient clinic, gastroenterology or surgical oncology clinic, or hospital outpatient department used for preoperative evaluation and documentation of staging. Service type: clinical evaluation and documentation of cancer staging (quality/registry documentation tied to oncology staging).
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the same day of the procedure or other service |