Summary & Overview
CPT 42806: Biopsy of Unknown Primary Lesion of the Nasopharynx
CPT code 42806 represents a nasopharyngeal biopsy performed to obtain tissue from an unknown primary lesion in the nasopharynx. This diagnostic procedure is important nationally for establishing histologic diagnosis in patients with suspicious lesions in the nasopharyngeal region, guiding staging and subsequent treatment decisions in oncology and otolaryngology. Payers commonly involved in reimbursement and coverage for this service include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. This publication provides a concise briefing on clinical context, typical sites of service, and the operational role of the code. Readers will find an overview of clinical indications and practice settings, common billing considerations, the set of modifiers typically reported with this code (listed separately), and relevant coding relationships. The summary also outlines what to expect in payer coverage patterns and administrative documentation needs at a national level. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 42806 describes a procedure in which a provider obtains a biopsy of an unknown primary lesion of the nasopharynx, the portion of the throat located behind the nose. This service is typically performed to establish a tissue diagnosis when a lesion in the nasopharynx is present but the primary site is not known.
-
Service type: Diagnostic biopsy procedure
-
Typical site of service: Outpatient otolaryngology clinic or ambulatory surgical center; may also be performed in a hospital outpatient setting depending on clinical complexity and anesthesia requirements.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred to an otolaryngology clinic for evaluation of an unexplained nasopharyngeal mass or persistent unilateral serous otitis media, epistaxis, nasal obstruction, or cervical lymphadenopathy. After history, flexible nasopharyngoscopy identifies a suspicious lesion in the nasopharynx. Imaging (CT or MRI) may be obtained prior to biopsy to assess extent. Under local anesthesia with or without sedation, or in the operating room under general anesthesia, the provider performs a targeted biopsy of the nasopharyngeal lesion using endoscopic guidance to obtain tissue for histopathology and immunohistochemistry. The specimen is submitted with relevant clinical history and site information. Post-procedure instructions address bleeding, pain control, and signs of infection. Pathology results guide definitive management such as radiation, chemotherapy, or further surgical staging.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier; standard claim submission | Use when no special circumstances apply. |
| 11 | Office or outpatient surgical procedure | Use when the biopsy is performed in a provider office or outpatient facility as the primary procedure. |
| 22 | Unusual procedural services — increased complexity | Use when the biopsy required substantially greater work, e.g., complex exposure or extensive hemostasis. |