Summary & Overview
CPT 3370F: Breast Cancer Stage 0 Diagnosis, Asymptomatic Female
CPT code 3370F represents documentation that a female patient aged 18 years or older has been diagnosed with breast cancer staged as 0 (carcinoma in situ) with no signs or symptoms. As a diagnostic performance measure, this code captures early-stage, asymptomatic breast cancer identification and formal staging documentation. Nationally, accurate use of this code supports quality reporting, population health tracking of early detection, and appropriate care planning for patients with carcinoma in situ.
Key payers in the national landscape include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will find context on clinical use and documentation expectations for early-stage breast cancer, how 3370F fits into quality measurement and reporting, and where this code is typically applied in the care continuum (outpatient oncology or breast specialty settings).
This publication provides benchmarks and policy-relevant highlights where available, clarifies the clinical context for coding, and outlines areas of documentation focus for health systems and clinicians. Data not available in the input for specific modifiers, associated taxonomies, ICD-10 mappings, related codes, and service-line details is noted where applicable.
Billing Code Overview
CPT code 3370F documents a diagnosis of breast cancer staged as 0 (carcinoma in situ) in a female patient aged 18 years or older who shows no signs or symptoms of the disease. This code is a diagnostic performance measure reflecting documentation of an early-stage cancer diagnosis when the patient is asymptomatic.
Service Type: Diagnostic/Oncology Diagnosis Documentation
Typical Site of Service: Outpatient oncology clinic, breast specialty clinic, or ambulatory surgical center for diagnostic evaluation and documentation.
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is a female aged 18 years or older who has been diagnosed with breast carcinoma in situ (stage 0) following screening mammography and confirmatory biopsy. She presents for routine oncology follow-up in an outpatient clinic. The oncology provider documents history, review of systems, physical breast exam, imaging review (mammography, ultrasound, or MRI as indicated), pathology correlation, and documents the diagnosis explicitly as stage 0 breast cancer with no current signs or symptoms of disease. The clinical workflow includes chart review of prior pathology and imaging reports, verification of staging per AJCC criteria, counseling documented in the medical record, and care-plan entries for surveillance, surgery consult, or adjuvant therapy referral as appropriate. Typical site of service is outpatient clinic (oncology or breast surgery clinic) or ambulatory care center where evaluation and management and documentation of disease stage is performed.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable E/M service by the same physician on the same day of a procedure | When an evaluation and management visit is performed on the same day as a minor procedure and the E/M is distinct |
59 |