CPT 29046: Body Cast Application for Trunk and Spine Immobilization
CPT code 29046 represents the application of a body cast extending from the shoulders to the hips and down both thighs to immobilize the trunk and spine after surgical correction of congenital spinal deformity or repair of traumatic spine and pelvic injuries. This procedure is used when circumferential stabilization of the thoracic and lumbar regions is required in the immediate postoperative or acute inpatient setting. Nationally, proper coding of this service affects hospital and surgical facility case mix, postoperative care records, and accurate capture of orthopaedic immobilization services.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. The publication summarizes how CPT code 29046 is defined, common clinical contexts for use, and payer coverage patterns. Readers will find benchmarks for service categorization, comparisons to related upper-extremity and long-arm immobilization codes, and clinical context relevant to orthopaedic and trauma surgical teams.
The report highlights typical sites of service, the clinical scenarios prompting a body cast (postoperative correction of congenital deformity and repair of traumatic spine or pelvic damage), and where this code sits relative to other immobilization procedures. Data not available in the input: specific payer reimbursement rates and utilization metrics. The content is intended to support coding accuracy, clinical documentation alignment, and payer discussions at a national level.
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Billing Code Overview
CPT code 29046 describes the application of a body cast that limits motion of the trunk and spine following surgical correction of a congenital spinal deformity or repair of traumatic injury to the spine and pelvis. The cast extends from the shoulders to the hips and down both thighs, providing circumferential immobilization of the thoracic and lumbar regions.
Service type: Orthopaedic immobilization / postoperative external immobilization
Typical site of service: Inpatient hospital or ambulatory surgical center, provided immediately postoperatively or during the acute postoperative inpatient stay when trunk and spinal immobilization is required.
Clinical & Coding Specifications
Clinical Context
A teenage patient is admitted following a motor vehicle collision with multiple thoracolumbar and pelvic injuries. After surgical stabilization of a thoracic spinal fracture and fixation of a pelvic ring injury, the orthopaedic trauma surgeon applies a body cast extending from the shoulders to the hips and down both thighs to immobilize the trunk and spine during the early postoperative healing period. The patient is managed on the orthopaedic inpatient service; cast application occurs in the operating room under sterile conditions with the patient still under anesthesia. Post-application workflow includes neurovascular checks of the lower extremities, documentation of cast fit and skin protection, imaging to confirm alignment, and scheduled outpatient follow-up for cast removal or transition to a brace. Typical payors involved include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work, time, or complexity substantially exceeds typical for body cast application due to complicated wounds or deformity correction. |
23 | Unusual anesthesia | Use when general anesthesia is required specifically for cast application in addition to the primary surgical anesthesia plan. |
26 | Professional component | Use when reporting only the physician professional component separate from facility or technical services. |
50 | Bilateral procedure | Use when the cast application procedure is reported for bilateral anatomic regions if payer requires. |
51 | Multiple procedures | Use when the body cast application is billed with other distinct procedures during the same operative session. |
52 | Reduced services | Use when a shortened or partially completed cast application is performed. |
53 | Discontinued procedure | Use when cast application is started but aborted for documented clinical reasons. |
62 | Two surgeons | Use when two surgeons work together as primary surgeons on the same procedure requiring distinct, documented portions of the operation. |
63 | Procedural service—under 10‑year-old | Use when patient is under 10 years old and special pediatric considerations apply. |
78 | Return to operating room for related procedure | Use when reoperation is needed for cast-related complications during the postoperative period. |
80 | Assistant surgeon | Use when an assistant surgeon performs a portion of the procedure and payer allows assistant reporting. |
81 | Minimum assistant surgeon | Use when a minimal assistant role meets payer criteria for minimal assistant reporting. |
82 | Assistant surgeon (when qualified resident unavailable) | Use when a qualified resident is not available and an assistant surgeon is required. |
| Taxonomy Code | Specialty | Notes |
|---|---|---|
207X00000X | Orthopaedic Surgery Physician | Primary specialty performing spinal and pelvic fixation and subsequent body cast application. |
207XX0004X | Orthopaedic Trauma Physician | Specialist managing complex fractures and postoperative immobilization with body casting. |
207XX0801X | Sports Medicine (Orthopaedic Surgery) Physician | May be involved for spine or pelvis injuries in athletes and postoperative immobilization planning. |
Related Diagnoses
| ICD-10 Code | Description | Clinical Relevance |
|---|---|---|
S42.401A | Unspecified fracture of shaft of humerus, right arm, initial encounter for closed fracture | Upper extremity fracture that may coexist with trunk/spine trauma; body cast immobilizes torso after spinal fixation while arm fractures are managed separately. |
S52.501A | Unspecified fracture of the lower end of right radius, initial encounter for closed fracture | Distal radius fracture may coexist after trauma; body cast addresses trunk stability while wrist fractures receive local immobilization. |
S52.301A | Unspecified fracture of shaft of radius, right arm, initial encounter for closed fracture | Forearm shaft fracture occurring with spinal/pelvic injuries; body cast provides trunk support during overall recovery. |
S52.201A | Unspecified fracture of shaft of ulna, right arm, initial encounter for closed fracture | Ulnar shaft fracture that may be present in polytrauma cases requiring trunk immobilization. |
S42.202A | Unspecified fracture of shaft of humerus, left arm, initial encounter for closed fracture | Contralateral humeral fracture in bilateral upper extremity injuries accompanying spinal trauma requiring body cast immobilization. |
Related CPT Codes
| CPT Code | Description | Relationship to This Procedure |
|---|---|---|
29125 | Application of short arm splint (forearm to hand); static | May be used for concurrent ipsilateral upper extremity splinting when injuries involve the arm and body cast is focused on trunk immobilization. |
29130 | Application of finger splint; static | Used when isolated digital immobilization is required in addition to trunk/spine immobilization. |
29065 | Application of long arm cast (shoulder to hand) | Alternative or adjunct immobilization when upper extremity stabilization from shoulder to hand is needed instead of or in addition to body cast. |
29105 | Application of long arm splint (shoulder to hand); static | Temporary upper extremity stabilization option performed before or after body cast application when splinting is preferred. |