CPT 39401 Mediastinoscopy Reimbursement

CPT code 39401 represents mediastinoscopy with excision of one or more abnormal-appearing tissue samples for pathologic analysis. This procedure is a diagnostic surgical endoscopy used to inspect and biopsy the mediastinum, most commonly to evaluate suspected malignancy or other mediastinal disease. Nationally, the code is important because it captures a key invasive diagnostic procedure that influences staging, treatment planning, and care pathways for thoracic malignancies and mediastinal disorders. Payers commonly involved in coverage and payment include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.

Readers will find an overview of clinical context and service setting, common payer coverage patterns, and relevant billing considerations tied to procedure coding and site-of-service distinctions. The publication summarizes benchmarks and utilization context where available, highlights policy and documentation factors that affect claim processing, and outlines typical clinical indications that align with the procedure. Data not available in the input will be identified as such. The content is aimed at clinicians, coding professionals, and policy analysts seeking a concise reference on clinical purpose, payer landscape, and operational implications for CPT code 39401.

Billing Code Overview

CPT code 39401 describes a mediastinoscopy with excision of one or more samples of any abnormal-appearing tissue mass for analysis. The provider inserts a thin rigid or flexible instrument through a small incision in the neck or upper chest to inspect the mediastinum — the central compartment of the chest cavity between and in front of the lungs — and removes tissue for diagnostic evaluation, including assessment for cancer or other disease.

Service type: Diagnostic surgical endoscopy with tissue excision
Typical site of service: Operating room or procedural suite in a hospital or ambulatory surgical center

Clinical Context

A 58-year-old patient with progressive cough, unexplained weight loss, and a central mediastinal mass identified on chest CT is referred for diagnostic mediastinoscopy. Pre-procedure workflow includes history and physical, coagulation assessment, informed consent, and anesthesia evaluation. The procedure is performed in an operating room or procedure suite under general anesthesia with endotracheal intubation. The surgeon makes a small incision above the sternal notch, inserts a rigid or flexible mediastinoscope into the superior mediastinum to directly visualize mediastinal structures, and obtains excisional biopsies of any suspicious lymph nodes or masses. Specimens are placed in separate, labeled containers for histopathology and microbiology. Post-procedure workflow includes airway monitoring in the PACU, chest radiograph if clinically indicated, pain control, and postoperative pathology follow-up to guide staging or therapy. Typical sites of service are hospital inpatient, hospital outpatient department, or ambulatory surgery center depending on patient stability and comorbidities.

Coding Specifications

Modifier	Description	When to Use
`00`	Default/No modifier	Used when no specific modifier applies.
`11`	Office or other outpatient visit

Taxonomy Code	Specialty	Notes
`207V00000X`	Thoracic Surgery	Primary specialty performing mediastinoscopy for diagnostic and staging purposes.
`2084P0800X`	Otolaryngology	May perform transcervical mediastinoscopy and related procedures.
`2085S0120X`	Pulmonology	Performs mediastinal evaluation using bronchoscopic techniques; may coordinate care for mediastinoscopy.
`207K00000X`	General Surgery	Performs mediastinal procedures in some settings, including diagnostic biopsies.
`207L00000X`	Cardiothoracic Surgery	Performs mediastinal exploration and complex resections when indicated.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`C34.90`	Malignant neoplasm of unspecified part of unspecified bronchus or lung	Mediastinal biopsy may be used to stage or confirm metastatic involvement in suspected lung cancer.
`C78.7`	Secondary malignant neoplasm of liver and intrahepatic bile duct	Included when mediastinal staging is needed for metastatic workup (note: not primary mediastinal but staging relevance).
`C77.9`	Secondary and unspecified malignant neoplasm of lymph nodes	Mediastinoscopy is used to obtain nodal tissue to confirm metastatic disease.
`D86.0`	Sarcoidosis of lung	Mediastinoscopy provides tissue diagnosis for granulomatous disease when less invasive sampling is nondiagnostic.
`J84.10`	Pulmonary fibrosis, unspecified	Mediastinal evaluation may be indicated when there is concern for alternative diagnoses or unexplained mediastinal adenopathy.
`R09.89`	Other specified symptoms and signs involving the circulatory and respiratory systems	Presents with nonspecific chest symptoms prompting mediastinal evaluation and biopsy.
`R91.8`	Other nonspecific abnormal findings of lung field	Imaging abnormality leading to tissue diagnosis via mediastinoscopy.
`D47.1`	Chronic myeloproliferative disease	Mediastinal lymphadenopathy evaluation may be necessary in hematologic disorders.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`31505`	Laryngoscopy, tracheoscopy; direct, with diagnostic or therapeutic services	May be performed preoperatively or concurrently for airway assessment when endotracheal access or airway lesions are a concern.
`31628`	Bronchoscopy, rigid or flexible, with transbronchial biopsy(s), multiple	Performed alongside or as an alternative for sampling central lesions or peribronchial nodes.
`38500`	Biopsy or excision of lymph node(s); superficial	May be performed for accessible peripheral nodes when staging complements mediastinal sampling.
`39000`	Mediastinotomy (Chamberlain procedure) for biopsy	Alternative open approach for anterior mediastinal masses when mediastinoscopy is not feasible.
`76942`	Ultrasonic guidance for needle placement (eg, biopsy)	Used when ultrasound guidance assists in preoperative localization or percutaneous sampling prior to or instead of mediastinoscopy.

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Summary & Overview

CPT 39401: Mediastinoscopy with Excisional Biopsy