Summary & Overview
CPT 3390F: Colon Cancer, Stage IV
CPT code 3390F identifies clinical documentation that an adult patient has colon cancer staged as IV, reflecting tumor invasion, regional nodal involvement, and distant metastases. Capturing stage IV status is vital for care planning, oncology treatment decisions, and downstream claims categorization across national payers. This summary addresses the clinical meaning of the code, common sites where stage documentation occurs, and payers typically referenced in national analyses.
Key payers covered include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on the clinical role of staging documentation, the service settings where this code is recorded, and what to expect when this code appears on medical records or claim lines. The publication also outlines available benchmarks, relevant policy updates that affect documentation and coding accuracy, and how stage IV designation intersects with cancer care coordination and payment pathways.
Data elements not supplied in the input—such as common modifiers, associated taxonomies, specific ICD-10 pairings, and related procedure codes—are noted as unavailable where applicable. The focus is national in scope, emphasizing the importance of accurate stage documentation for clinical management, quality measurement, and claims processing.
Billing Code Overview
CPT code 3390F indicates that a provider has diagnosed a patient aged 18 years or older with colon cancer documented as stage IV, defined by tumor invasion of any layer of the colon, involvement of regional lymph nodes, and presence of distant metastases to other organs or structures. This code documents clinical staging rather than a specific procedure or treatment.
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Service type: Clinical diagnosis and staging documentation
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Typical site of service: Oncology clinic, hospital inpatient unit, or outpatient cancer center
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient presents to an oncology clinic after diagnostic colonoscopy and imaging studies that confirm adenocarcinoma of the colon with hepatic lesions on CT and biopsy-proven metastasis. The oncology provider documents the diagnosis as stage IV colon cancer, noting tumor invasion through the colonic wall, regional lymph node involvement, and distant metastases to the liver. The clinical workflow includes: initial diagnosis by gastroenterology (colonoscopy and biopsy), staging with contrast-enhanced CT or PET-CT, multidisciplinary tumor board review, documentation of clinical stage in the outpatient oncology record, development of a systemic therapy plan (chemotherapy, targeted therapy, or immunotherapy), consideration of palliative vs. curative-intent interventions, and ongoing documentation of stage IV status for treatment planning, prognosis discussions, and billing. Typical site of service is an outpatient oncology clinic or hospital-based oncology practice for staging and treatment planning; inpatient hospital services occur when complications or inpatient therapy initiation are required. Typical patient scenario: an adult (≥18 years) with symptomatic or screen-detected colon cancer found to have metastases on imaging, requiring staging documentation and coordination of systemic therapy and supportive care services.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management (E/M) service by the same physician on the day of a procedure | Use when a distinct E/M visit is performed and documented on the same day as a procedure related to cancer care or imaging review for staging decisions |