Summary & Overview
CPT 3372F: Stage I Breast Cancer, Tumor 1 cm or Less
CPT code 3372F is a supplemental tracking code indicating stage I breast cancer with a tumor size of 1 cm or less. As a documentation-only code, it supports clinical registries, quality measurement, and care coordination by capturing precise staging and tumor-size data in the medical record. Nationally, accurate use of this code matters for benchmarking treatment patterns, quality reporting, and population-level cancer surveillance.
Payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the code's clinical meaning, typical sites of service, and the role it plays in documentation workflows. The publication reviews common billing and reporting contexts for supplemental tracking codes, summarizes payer coverage considerations where available, and outlines how 3372F fits into oncology quality reporting structures.
This summary provides clinicians, clinical coders, and policy analysts with the context needed to understand why the code is recorded, what information it conveys, and how it contributes to broader quality and registry efforts. Data not available in the input is noted where specific payer policies, modifiers, taxonomies, ICD-10 pairings, and related codes would normally be listed.
Billing Code Overview
CPT code 3372F documents that the patient has stage I breast cancer with a tumor size of 1 cm or less. This code is a supplemental tracking code used to capture cancer staging and tumor size information in the medical record for quality measurement and registry reporting.
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Service type: Cancer staging and tumor documentation/tracking
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Typical site of service: Oncology clinic or outpatient surgical center
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is a woman recently diagnosed with early-stage breast cancer following screening mammography or diagnostic workup. She presents to a multidisciplinary breast clinic where the surgical oncologist documents tumor characteristics and staging after imaging and core needle biopsy. The clinical workflow includes obtaining pathological tumor size measurement (≤1 cm) from the surgical pathology report or imaging report, documenting tumor stage as Stage I breast cancer, and assigning the supplemental tracking code 3372F in medical records and quality reporting to indicate the documented tumor size criterion has been met. The patient encounter may occur in an outpatient hospital clinic, ambulatory surgical center, or office-based oncology practice and is part of cancer registry tracking and quality reporting rather than a billable standalone procedure.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
25 | Significant, separately identifiable evaluation and management service by the same physician on the day of a procedure | Use when the E/M visit is distinct from the cancer staging documentation or minor procedure performed the same day |
59 |