CPT code 70120 designates plain radiographic imaging of the mastoid cavity with fewer than three views per side. This diagnostic X-ray is used to evaluate suspected mastoiditis, vestibular disorders including vertiginous syndromes, and palpable head or neck masses. Nationwide, mastoid radiography remains a focused, low-complexity imaging option when clinical presentation suggests localized bony or soft-tissue changes of the mastoid region that may not require cross-sectional imaging.

Key payers in common billing analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical indications and typical service settings, plus payer coverage context and commonly seen billing modifiers. The publication summarizes typical use cases, where CPT code 70120 fits in diagnostic pathways, and how it compares to higher-acuity imaging choices. It also outlines practical benchmarks for utilization and coding considerations relevant to radiology departments, ambulatory imaging centers, and billing teams.

This material is intended to inform clinicians, practice managers, and revenue cycle professionals about the clinical purpose of CPT code 70120, common settings where the service is delivered, and what to expect in payer coverage discussions.