CPT Code for Thumb X-Ray
The standard CPT code for a thumb radiograph is 73140 (radiologic examination, finger[s], minimum of 2 views), which applies to thumb imaging since the thumb is anatomically classified as a finger for billing purposes.
Standard Imaging Protocol
According to ACR Appropriateness Criteria, most fractures of the thumb are visible on a 2-view radiographic examination 1. The standard approach includes:
- Minimum 2 views (typically AP and lateral projections)
- Optional oblique view for increased diagnostic yield, though this provides only a slight improvement in fracture detection 1
- The oblique projection can be obtained along with a PA examination of the whole hand 1
Coding Considerations
CPT 73140 is the appropriate code for thumb radiography and covers:
- Minimum of 2 views of any finger(s), including the thumb
- Standard projections (AP, lateral, oblique as needed)
Common Coding Pitfalls
- Do not confuse with hand codes: CPT 73130 (hand, minimum 2 views) is for the entire hand, not isolated thumb imaging
- Do not use wrist codes: CPT 73100-73110 are for wrist imaging, which requires different projections
- Bilateral imaging: If both thumbs are imaged, append modifier -50 (bilateral procedure) or report the code twice with RT/LT modifiers depending on payer requirements
Clinical Context
The ACR guidelines emphasize that radiography is always indicated as initial imaging for suspected acute hand and wrist trauma 1. For thumb-specific injuries:
- 2-view examination detects most fractures adequately
- 3-view examination (adding oblique) marginally improves sensitivity 1
- Advanced imaging (CT, MRI) is rarely needed acutely for isolated thumb injuries unless initial radiographs are equivocal and clinical suspicion remains high
The relative radiation level for thumb radiography is minimal (☢ designation), representing <0.1 mSv effective dose 1.