Summary & Overview
CPT 0209T: Air and Bone Conduction Hearing Threshold Testing
CPT code 0209T represents a diagnostic audiology procedure that uses both air conduction and bone conduction testing to determine a patient’s hearing thresholds and establish the type of hearing loss. This code is nationally relevant because accurate differentiation of conductive versus sensorineural hearing loss guides clinical management, referral decisions, and appropriate use of hearing aids or medical/surgical interventions. Insurers and Medicare use such codes to classify and reimburse diagnostic audiology services, making clarity around coding important for billing consistency and audit readiness.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, typical sites of service, and the role of this test in diagnostic pathways. The publication also provides benchmarks and policy-relevant notes where available, signals about common modifier usage, and crosswalks to related diagnostic services when provided.
This summary equips clinicians, billing professionals, and policy analysts with a clear understanding of what CPT code 0209T denotes, why it matters for patient care and payer processing, and what to expect when this service appears on an outpatient audiology or otolaryngology claim. Data not available in the input is identified where applicable.
Billing Code Overview
CPT code 0209T describes an audiologic procedure in which the provider uses both air conduction and bone conduction testing to determine the patient’s hearing thresholds and to establish the type of hearing loss. This service is a diagnostic hearing evaluation that distinguishes between conductive, sensorineural, and mixed hearing loss by comparing responses obtained through air and bone conduction methods.
Service Type: Diagnostic audiologic testing
Typical Site of Service: Audiology clinic, otolaryngology clinic, or other outpatient settings
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Clinical & Coding Specifications
Clinical Context
A 52-year-old patient presents to an outpatient audiology clinic with progressive difficulty understanding speech and unilateral tinnitus. The provider performs a diagnostic audiologic evaluation that includes both air-conduction and bone-conduction pure-tone threshold testing to determine the degree and type of hearing loss (conductive, sensorineural, or mixed). The typical workflow: the patient history and otologic examination are completed; otoscopy rules out obstructions; the audiologist instructs the patient and performs air-conduction testing via headphones or insert earphones across standard frequencies, followed by bone-conduction testing with a bone oscillator applied to the mastoid to compare thresholds. Results are documented in an audiogram and interpreted to establish the type of hearing loss and guide further management such as ENT referral, imaging, amplification fitting, or medical treatment. Typical sites of service include outpatient audiology clinics, otolaryngology offices, and hospital outpatient departments.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the work required to perform testing is substantially greater than typically required (rare for routine audiometry; may apply if testing is prolonged or unusually complex). |
23 |