Summary & Overview
CPT 31579: Laryngoscopic Examination with Stroboscopy
CPT code 31579 represents a diagnostic laryngoscopic examination using a flexible or rigid laryngoscope combined with stroboscopy to evaluate laryngeal structure and vocal fold vibration. This code captures a commonly used specialty diagnostic procedure in otolaryngology and voice clinics for patients with hoarseness, voice changes, or suspected vocal fold pathology. Nationally, accurate coding for this procedure affects clinical documentation, preauthorization workflows, and claims adjudication for specialty outpatient services.
Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of clinical context for use of the code, typical sites of service, and the role of stroboscopy in assessing vocal fold function. The publication also covers payer-specific coverage considerations, common modifier usage reported for this service, and benchmarking of utilization where available.
The report is organized to help clinicians, billing professionals, and policy stakeholders understand the clinical intent of CPT code 31579, how payers commonly treat the service in claims and coverage policies, and practical documentation elements that support medical necessity. Data not available in the input are noted explicitly in sections where they would appear.
Billing Code Overview
CPT code 31579 describes a laryngoscopic examination of the larynx (voice box) using a flexible or rigid laryngoscope with stroboscopy. The procedure allows visualization of the laryngeal structures and assessment of vocal fold vibration by illuminating and intermittently flashing a bright light, enabling evaluation of both structure and function of the vocal folds.
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Service type: Diagnostic endoscopic laryngeal examination with stroboscopic assessment
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Typical site of service: Otolaryngology clinic, outpatient surgical suite, or specialty voice clinic
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient presents to an otolaryngology clinic with a 3-month history of progressive hoarseness, intermittent throat discomfort, and vocal fatigue. The provider performs an outpatient transnasal flexible laryngoscopy (or in some cases a rigid laryngoscopy) to visually inspect the supraglottic and glottic structures and vocal fold mobility. Because the patient reports voice changes and the clinician suspects mucosal lesions or vibratory abnormalities, the exam includes stroboscopy to assess vocal fold edge, wave, symmetry, and periodicity under slowed apparent motion. The encounter typically occurs in an ambulatory surgical center or office-based ENT clinic with topical anesthesia and possible decongestant. Findings such as vocal fold nodules, polyps, hemorrhage, or paresis are documented with still images and video; stroboscopic parameters and tolerated maneuvers (sustained phonation, pitch glides) are recorded. The report documents the procedure method (flexible or rigid laryngoscope), stroboscopy performed, time, patient tolerance, and any specimens or additional procedures if applicable. Billing reflects the use of code 31579 for the diagnostic laryngoscopy with stroboscopy, with modifiers applied as clinically appropriate based on service context and payer rules.
Coding Specifications
| Modifier | Description | When to Use |
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