Summary & Overview
CPT 3378F: Breast Cancer Stage III Diagnosis Documentation
CPT code 3378F documents a clinical finding: a female patient aged 18 or older diagnosed with breast cancer staged as III, defined by a tumor of any size commonly with regional lymph node involvement. As a performance/documentation code, 3378F captures a specific stage designation that informs clinical decision-making, quality measurement, and claims processing across oncology care settings. Nationally, accurate staging documentation influences treatment planning, quality reporting, and appropriate use of services for patients with advanced breast cancer.
Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for stage III breast cancer documentation, typical service settings where 3378F is recorded, and the kinds of benchmarks and policy considerations that affect coding and reporting. The publication summarizes common uses of the code in oncology workflows, implications for quality measurement and claims adjudication, and areas where coding practices intersect with payer documentation requirements.
Data elements not provided in the input (such as specific modifiers, associated taxonomies, ICD-10 code mappings, payer-specific rules, and related codes) are noted as unavailable where applicable. The content focuses on clinical meaning, service context, and the role of documented stage III breast cancer in national care and reporting frameworks.
Billing Code Overview
CPT code 3378F indicates that the provider documents a female patient, age 18 or older, with breast cancer staged as III, describing a tumor of any size typically with regional lymph node involvement.
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Service type: Oncology diagnosis and staging documentation
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Typical site of service: Oncology clinic or hospital outpatient setting where cancer staging and diagnostic documentation occur
Clinical & Coding Specifications
Clinical Context
A 52-year-old female presents to a multidisciplinary oncology clinic after biopsy-confirmed invasive ductal carcinoma of the left breast. Imaging and sentinel lymph node biopsy indicate regional nodal involvement consistent with stage III disease. The oncology provider documents clinical staging as Stage III breast cancer and records tumor size, nodal status, and any relevant biomarker results (ER/PR/HER2). The clinical workflow includes initial diagnostic evaluation (mammography, ultrasound, core needle biopsy), staging workup (breast MRI and CT or PET as indicated), multidisciplinary tumor board review, documentation of stage in the medical record, treatment planning (neoadjuvant chemotherapy followed by surgery or primary surgery with adjuvant therapy), and billing for the documented diagnosis of stage III breast cancer using the appropriate reporting codes. Typical site of service is an outpatient oncology clinic or hospital-based cancer center where the oncologist documents staging and treatment plans. Service type: office-based evaluation and management and oncology documentation of cancer staging.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service on the same day as a procedure | Use when the provider documents a distinct E/M service in addition to staging documentation or minor procedures on the same day |