CPT 29065: Long Arm Cast Application for Arm Fractures

CPT code 29065 documents the application of a long arm cast that encases both the upper and lower arm to treat fractures and correct deformities of the forearm, elbow, and humerus. This procedure is a routine immobilization technique in orthopaedic and trauma care and is commonly used following closed fractures and certain post-reduction managements. Nationally, accurate coding for cast application is important for procedural transparency, appropriate billing, and quality measurement in orthopaedic trauma care.

Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, United Healthcare, and Medicare. The publication presents payer-specific coverage notes, common billing modifiers observed on service lines, and clinical contexts tied to relevant ICD-10 fracture diagnoses to support correct claim submission.

Readers will find a concise clinical context for when 29065 is appropriate, comparisons to neighboring cast application codes, and a practical summary of common sites of service. The material also outlines associated coding relationships to typical fracture diagnoses (for example, humerus and radius/ulna shaft and distal fractures) and highlights procedural settings where the long arm cast is most often applied. Data not available in the input is explicitly noted where applicable.

Billing Code Overview

CPT code 29065 describes the application of a long arm cast that encases the upper and lower arm. This procedure is used to treat fractures of the arm bones and to correct deformities of the forearm, elbow, and humerus.

Service Type: Cast application / Orthopaedic immobilization

Typical Site of Service: Emergency department, hospital outpatient department, ambulatory surgery center, or clinic/office

Clinical Context

A 34-year-old male presents to the emergency department after a fall from a ladder onto his outstretched right arm. He reports immediate pain, swelling, and inability to move the elbow and wrist normally. Radiographs demonstrate an acute, closed fracture of the midshaft of the right radius and an associated nondisplaced distal humeral shaft fracture. The orthopedic trauma team evaluates the patient, performs a focused neurovascular exam, documents consent, and applies a long arm cast (application of a cast encasing the upper and lower arm) to immobilize the elbow and forearm while further treatment planning occurs. The procedure is coded with 29065 for application of a long arm cast.

The clinical workflow includes triage, imaging (plain radiographs), orthopedic consultation, pre-procedure checks and documentation, cast application in the ED or ambulatory procedure area, post-application neurovascular recheck, patient education on cast care and weight-bearing precautions, and scheduling of follow-up orthopedic clinic visit for repeat imaging and definitive management planning.

Coding Specifications

Modifier	Description	When to Use
`LT`	Left side	Use when the cast is applied to the left upper extremity (e.g., ).

Taxonomy Code	Specialty	Notes
`207X00000X`	Orthopaedic Surgery	Primary specialty performing fracture care and cast application.
`207XX0004X`	Orthopaedic Trauma	Subspecialty focus on acute fracture management and complex immobilization.
`207XS0117X`	Surgery of the Hand	Relevant when forearm/hand fractures or hand surgeons manage arm fractures and casting.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S42.401A`	Unspecified fracture of shaft of humerus, right arm, initial encounter for closed fracture	Humeral shaft fractures may require immobilization with a long arm cast when proximal or distal extension and elbow immobilization are needed.
`S52.501A`	Unspecified fracture of the lower end of right radius, initial encounter for closed fracture	Distal radius fractures sometimes require a long arm cast if elbow immobilization or forearm rotational control is necessary.
`S52.301A`	Unspecified fracture of shaft of radius, right arm, initial encounter for closed fracture	Midshaft radius fractures are stabilized by long arm casts to control forearm rotation and protect fracture alignment.
`S52.201A`	Unspecified fracture of shaft of ulna, right arm, initial encounter for closed fracture	Ulnar shaft fractures are commonly immobilized in long arm casts when combined with radius fractures or when elbow involvement requires immobilization.
`S42.202A`	Unspecified fracture of shaft of humerus, left arm, initial encounter for closed fracture	Left humeral shaft fracture requiring immobilization; indicates side-specific coding when cast applied to the left arm.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`29075`	Application of a cast encasing the lower arm (short arm cast)	Alternative for distal forearm fractures or when immobilization of the forearm and wrist only is indicated instead of a long arm cast.
`29085`	Application of a cast (neighboring code)	Related casting code in the series; used for other anatomic variants or as a coding alternative when appropriate.
`29086`	Application of a cast (neighboring code)	Related casting code in the series; used for adjacent procedures or differing cast types in the same episode.

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Summary & Overview