Summary & Overview
CPT 70120: Mastoid X‑ray, fewer than 3 views per side
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.
Billing Code Overview
CPT code 70120 describes plain radiographic imaging of the mastoid cavity with fewer than three views per side. The service is a diagnostic X-ray procedure performed to evaluate conditions such as mastoiditis, vertiginous syndromes or other vestibular disorders, and palpable swellings, masses, or lumps in the head and neck region.
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Service type: Diagnostic plain radiography of the mastoid
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Typical site of service: Outpatient radiology suites, hospital radiology departments, or ambulatory imaging centers
Clinical & Coding Specifications
Clinical Context
A 7-year-old child presents to the urgent care clinic with fever, ear pain, and a swollen postauricular area after several days of otitis media. The clinician suspects acute mastoiditis and orders imaging. The patient is escorted to the radiology department for plain radiography of the mastoid region. The radiologic technologist positions the head and obtains fewer than three views per side, typically an AP (anteroposterior) and an oblique or lateral view, per the provider order. The interpreting radiologist reviews images for mastoid air-cell opacification, cortical bone erosion, or subperiosteal abscess. Results are communicated to the referring ENT (otolaryngology) surgeon and the primary care provider; if findings suggest complication, the patient is triaged for ENT consultation and possible operative management.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the interpreting physician's service separate from the technical component |
TC | Technical component | Use when billing only the facility/technical portion (equipment, technologist) |