Summary & Overview
HCPCS G9705: AJCC Breast Cancer Stage I, T1b
HCPCS Level II code G9705 records AJCC breast cancer stage I: T1b (tumor > 0.5 cm and ≤ 1.0 cm). As a staging-specific HCPCS Level II code, G9705 supports standardized clinical documentation of early invasive breast cancer stage and may inform quality measurement, cancer registries, and care coordination at a national level. The code matters for consistent reporting across oncology practices, hospital outpatient departments, and multidisciplinary care teams.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find context on the clinical definition of T1b staging, the service type and typical sites of service where this documentation occurs, and how this code fits into national reporting and quality workflows. The publication provides benchmarks and policy context where available, explains common use cases for G9705, and outlines implications for documentation and administrative workflows. Data not available in the input is noted where applicable. This summary is written for a national audience and focuses on clinical and administrative relevance rather than state-level policy.
Billing Code Overview
HCPCS Level II code G9705 documents AJCC breast cancer stage I: T1b, indicating a tumor greater than 0.5 cm but less than or equal to 1.0 cm in greatest dimension. This code captures a specific, early invasive breast cancer stage for clinical staging records.
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Service type: Cancer staging documentation and reporting
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Typical site of service: Oncology clinic, hospital outpatient department, or other settings where cancer staging is performed
Clinical & Coding Specifications
Clinical Context
A 58-year-old woman presents to a breast surgical oncology clinic after routine screening mammography and diagnostic ultrasound identified a suspicious lesion in the left breast. Core needle biopsy confirms invasive ductal carcinoma. Imaging and pathology indicate a single palpable lesion measuring 0.8 cm in greatest dimension. The tumor is clinically staged as AJCC breast cancer Stage I: T1b (>0.5 cm but ≤1 cm). The surgeon documents tumor size, laterality, histology, receptor status, and plans for breast-conserving surgery (lumpectomy) with sentinel lymph node biopsy. Documentation of AJCC staging, including T1b tumor dimension, is recorded in the operative note, pathology request, and cancer registry abstraction. Typical workflow includes preoperative assessment, surgical resection with intraoperative localization as needed, final pathology confirming tumor size and margin status, and submission of the staging data element T1b into the electronic health record and cancer registry for quality reporting and billing with HCPCS Level II code G9705. Typical site of service is an outpatient ambulatory surgery center or hospital outpatient surgical unit.
Coding Specifications
| Modifier | Description | When to Use |
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