Summary & Overview
CPT 73503: Unilateral Hip X‑ray, Minimum Four Projections
CPT code 73503 denotes a unilateral hip radiographic study using at least four projections to assess for fracture, swelling, or other causes of hip pain; the pelvis may be included when performed. This code is a common imaging entry point for acute hip pain, trauma evaluation, and preoperative assessment, and it matters nationally because hip imaging is a frequent, standardized diagnostic service that intersects emergency care, orthopedics, and outpatient imaging workflows. Payers in the national analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn the clinical context of CPT code 73503, typical sites where the service is rendered, and how the procedure is characterized for billing and documentation. The publication summarizes common modifiers associated with imaging services, notes service-line placement in radiology and emergency settings, and highlights benchmarks and policy considerations relevant to imaging use and coding precision. This overview provides clinicians, billing professionals, and policy analysts with the core information needed to identify the procedure, interpret its clinical role, and locate where further details on coverage and payment practice can be found. Data not available in the input is clearly identified in supporting sections.
Billing Code Overview
CPT code 73503 describes a diagnostic radiology procedure that captures a minimum of four X-ray images of a single hip (left or right) from different projections to evaluate for fracture, swelling, or other causes of hip pain. The description notes that the pelvis may be included when the pelvis is examined as part of the procedure.
Service type: Diagnostic X‑ray procedure of one hip with multiple projections
Typical site of service: Outpatient radiology departments, hospital radiology suites, and freestanding imaging centers
Clinical & Coding Specifications
Clinical Context
A 72-year-old female presents to the emergency department after a mechanical fall at home with left hip pain, inability to weight-bear, and localized swelling. The emergency physician performs an initial clinical exam, documents point tenderness over the left greater trochanter, and orders hip imaging to evaluate for fracture. The patient is transported to the radiology suite where a radiologic technologist acquires a minimum of four radiographic images of the left hip from different projections, typically including anteroposterior pelvis (or AP hip) and one or more orthogonal views (for example lateral frog‑leg or cross‑table lateral) per departmental protocol. Images are reviewed by the interpreting radiologist who documents the presence or absence of fracture, dislocation, degenerative changes, and any pelvic involvement. Results are entered into the electronic health record and communicated to the emergency physician for treatment planning (e.g., immobilization, orthopedic consult, pain control). This workflow applies equally to right or left hip imaging and may include limited pelvic imaging when clinically indicated.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the study is of the left hip |
RT |