Summary & Overview

HCPCS G8946: Minimally Invasive Breast Biopsy Attempt, Non-diagnostic

HCPCS Level II code G8946 denotes a minimally invasive breast biopsy attempt that was not diagnostic for breast cancer, commonly used when sampling yields high-risk lesions (for example, atypical ductal hyperplasia, lobular neoplasia, or papillary lesions). This code is important nationally because it captures cases where additional diagnostic steps, such as repeat biopsy or surgical excision, may be required, affecting care pathways and resource use across imaging and surgical services. Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will gain a concise overview of the clinical context for G8946, how it maps to typical sites of service (radiology suites and ambulatory procedural settings), and what to expect in terms of coding practice when a minimally invasive biopsy fails to produce a definitive diagnosis. The publication also summarizes common modifiers and payer considerations, outlines typical clinical scenarios associated with the code, and highlights where benchmarking and policy updates could influence utilization and coverage. Data not available in the input for payer-specific rates, associated taxonomies, ICD-10 diagnoses, related codes, and detailed service-line mapping.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareG8946HCPCS Level IIbreast biopsyminimally invasive biopsynon-diagnostic biopsybreast imagingradiology proceduresoutpatient procedure

Billing Code Overview

HCPCS Level II code G8946 describes a minimally invasive breast biopsy method that was attempted but did not yield a diagnostic result for breast cancer. The description encompasses cases involving high-risk breast lesions such as atypical ductal hyperplasia, lobular neoplasia, atypical lobular hyperplasia, lobular carcinoma in situ, atypical columnar hyperplasia, flat epithelial atypia, radial scar, complex sclerosing lesion, papillary lesion, or any lesion with spindle cells.

Service Type: Minimally invasive breast biopsy attempt, non-diagnostic

Typical Site of Service: Breast imaging or outpatient procedural settings, including radiology suites or ambulatory surgical centers where image-guided core or vacuum-assisted breast biopsies are performed.

Data not available in the input for payers, associated taxonomies, ICD-10 diagnoses, related codes, and service line.

Clinical & Coding Specifications

Clinical Context

A 52-year-old woman is referred to breast imaging after a screening mammogram identifies a suspicious 8 mm irregular mass in the upper outer quadrant of the left breast. Diagnostic ultrasound confirms a small, hypoechoic lesion. A radiology-guided minimally invasive core needle biopsy (stereotactic or ultrasound-guided) is performed using vacuum-assisted or spring-loaded core devices. Pathology returns a high-risk lesion such as atypical ductal hyperplasia (ADH). The biopsy is considered nondiagnostic for malignancy because the specimen shows a high-risk lesion but insufficient or no evidence of invasive carcinoma or ductal carcinoma in situ (DCIS).

Clinical workflow:

Patient arrives to an outpatient breast imaging suite or ambulatory surgical center; informed consent and pre-procedure assessment are completed.
Image-guided minimally invasive biopsy is performed by a breast radiologist, surgical oncologist, or interventional radiologist under local anesthesia, with specimen radiography if calcifications are targeted.
Pathology review yields a high-risk lesion (for example, atypical ductal hyperplasia, lobular neoplasia, radial scar, papillary lesion) that is not diagnostic of cancer.
Multidisciplinary review (radiology, pathology, surgical oncology) determines next steps, which may include diagnostic excisional biopsy or surgical consultation due to discordant imaging-pathology or the presence of atypia.

Typical site of service: outpatient breast imaging center, hospital outpatient department, or ambulatory surgical center.

Service type: image-guided minimally invasive breast biopsy attempt resulting in a non-diagnostic or high-risk benign pathology report (procedure reporting a sampling attempt that did not diagnose breast cancer).

Coding Specifications

Modifier	Description	When to Use
`22`	Increased procedural services	Use when work, time, or technical effort substantially exceeds typical for the biopsy (document justification).
`23`	Unusual anesthesia	Use when general anesthesia or deep sedation is required for a procedure normally performed with local anesthesia.
`52`	Reduced services	Use when the biopsy was partially reduced or not fully completed but some work was performed.
`53`	Discontinued procedure	Use when the biopsy was started but terminated due to patient condition or technical issues prior to completion.
`54`	Surgical care only	Use when only the surgical portion is billed and pre/post-operative care is billed by another provider.
`55`	Postoperative management only	Use when only global postoperative care is billed by the reporting clinician.
`56`	Preoperative management only	Use when only preoperative care is billed by the reporting clinician.
`62`	Two surgeons	Use when two surgeons work together as primary surgeons during the procedure.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery	Use when an advanced practice clinician assists during the operative component.
`CO`	Chief surgeon - when another surgeon performs as assistant	Use when the reporting surgeon is the chief surgeon and another surgeon acts as assistant.
`CQ`	Service by a physician team - reporting clinician is the team lead	Use when services are provided by a physician team under a documented team model.
`FX`	One physician performed parts of the surgery and another performed other parts (distinct operative team)	Use when two different surgeons perform separate portions of the procedure.
`QK`	Medical direction of two, three, or four assistants	Use when the physician medically directs multiple assistants at the biopsy or procedure.
`QX`	Services performed by a physician assistant, nurse practitioner, or clinical nurse specialist	Use when an APP performs the procedure under physician supervision.

Taxonomy Code	Specialty	Notes
`207RH0002X`	Radiology, Diagnostic Radiology	Breast radiologists commonly perform image-guided biopsies.
`208000000X`	General Surgery	Surgical oncologists or breast surgeons perform diagnostic excisions and some biopsies.
`363L00000X`	Pathology	Surgical pathologists interpret biopsy specimens and report high-risk lesions.
`207T00000X`	Interventional Radiology	Interventional radiologists perform image-guided breast procedures in some settings.
`363A00000X`	Anatomic and Clinical Pathology	Provides detailed histopathologic assessment of breast specimens.

ICD-10 Code	Description	Clinical Relevance
`N60.11`	Fibrocystic breast changes of right breast	Fibrocystic changes can produce imaging findings leading to biopsy and may yield benign or high-risk pathology.
`N60.12`	Fibrocystic breast changes of left breast	Same relevance when the lesion is in the left breast prompting biopsy.
`N63`	Unspecified lump in breast	Common presenting finding prompting image-guided biopsy when mass is identified.
`R92.8`	Other abnormal and inconclusive findings on diagnostic imaging of breast	Used for suspicious imaging findings leading to biopsy where imaging is inconclusive.
`D05.10`	Lobular carcinoma in situ (LCIS) of breast, unspecified breast	LCIS or lobular neoplasia may be diagnosed on core biopsy as a high-risk lesion requiring further management evaluation.
`N64.59`	Other specified disorders of breast	Captures nonspecific breast abnormalities that may result in biopsy and nondiagnostic pathology.
`D24.9`	Benign neoplasm of breast, unspecified	Papillomas or benign masses may be sampled and reported as a lesion without cancer.

CPT Code	Description	Relationship to This Procedure
`19083`	Image-guided (stereotactic) breast biopsy, percutaneous; with placement of localization device (e.g., clip) when performed	Often used for stereotactic biopsy when calcifications are targeted; may be the performed procedure before pathology returns high-risk lesion.
`19085`	Image-guided (ultrasound) breast biopsy, percutaneous, with placement of localization device when performed	Commonly used for ultrasound-guided core or vacuum-assisted biopsy leading to a nondiagnostic/high-risk result.
`19125`	Biopsy of breast, percutaneous, needle core, not using imaging guidance	Less commonly used; relates when anatomic landmarks suffice rather than imaging guidance.
`19120`	Excisional biopsy of breast, open, single lesion	May be performed after a nondiagnostic or high-risk percutaneous biopsy to obtain a definitive diagnosis.
`19290`	Placement of radiographic marker (e.g., clip) in breast, percutaneous	Often performed at time of biopsy to mark the sampled site for correlation or future excision if needed.

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