CPT Code Overview

CPT 29065 describes the application of a cast encasing the upper and lower arm. This long arm cast is used to treat fractures of the arm bones and to correct deformities involving the forearm, elbow, and humerus. The procedure is classified under Surgical Procedures on the Musculoskeletal System.

Typical site of service for CPT 29065 is an occupational or physical therapy setting providing outpatient therapy services. This reflects common practice where casting for rehabilitation and nonoperative fracture management is performed in ambulatory therapy environments rather than inpatient surgical suites.

A middle-aged patient presents to an outpatient occupational therapy clinic after sustaining a closed forearm or humeral fracture during a fall. Following initial emergency department evaluation and radiographic confirmation of a fracture, the orthopedic surgeon or hand surgeon reduces the fracture as indicated and requests application of a long arm cast to immobilize the elbow, forearm, wrist, and distal humerus. In the therapy setting the provider measures, prepares materials, and applies a long arm cast encasing the upper and lower arm to maintain alignment and support healing. The typical clinical workflow includes verification of the treating provider’s order, review of recent radiographs and operative/reduction notes, informed consent, limb preparation and padding, placement of stockinette and casting material, molding to the elbow and forearm contours, documentation of laterality, patient cast care instructions, and scheduling of follow-up radiographs and clinic visits.

Modifiers:

• LT — Used when the long arm cast is applied to the left upper extremity. Document laterality clearly in the medical record.

• RT — Used when the long arm cast is applied to the right upper extremity. Document laterality clearly in the medical record.

Associated provider taxonomies:

These taxonomies represent the specialties most likely to perform or supervise the application of a long arm cast for fractures of the humerus, radius, or ulna.

ICD-10 Diagnoses:

• S42.401A — Unspecified fracture of shaft of humerus, right arm, initial encounter for closed fracture

  Clinical relevance: A diaphyseal humeral fracture that may require immobilization with a long arm cast to maintain alignment and restrict elbow motion during healing.

• S52.501A — Unspecified fracture of the lower end of right radius, initial encounter for closed fracture

  Clinical relevance: A distal radius fracture where a long arm cast may be used when immobilization across the elbow is indicated, such as when forearm rotation must be restricted.

• S52.301A — Unspecified fracture of shaft of radius, right arm, initial encounter for closed fracture

  Clinical relevance: A radial shaft fracture that may be immobilized with a long arm cast to control rotation and support fracture healing.

• S52.201A — Unspecified fracture of shaft of ulna, right arm, initial encounter for closed fracture

  Clinical relevance: An ulnar shaft fracture where a long arm cast can provide necessary immobilization of the forearm and elbow.

• S42.202A — Unspecified fracture of shaft of humerus, left arm, initial encounter for closed fracture

  Clinical relevance: A humeral shaft fracture of the left arm that may be treated with long arm casting to immobilize the elbow and forearm during initial healing.

Related CPT Codes:

Relationship to primary code 29065:

• 29075 is a short arm cast application and serves as an alternative when immobilization of only the forearm and wrist is indicated instead of a long arm cast.

• 29085 and 29086 are neighboring codes within the cast application series and may represent similar or adjacent casting services; they can be considered alternatives or used in different clinical contexts depending on the body region and cast type.

Codes commonly used together or as alternatives:

• 29075 is commonly selected as an alternative to 29065 when the elbow and distal humerus do not require immobilization. 29085 and 29086 are neighboring procedure codes that may be used in place of 29065 depending on the specific cast applied.

National commercial means vary notably from Medicare. UnitedHealth Group and Cigna show the highest national mean rates at $152.45 and $145.92 respectively, while Medicare’s mean of $111.76 sits below the BUCA (average commercial) mean of $117.23 but above Aetna’s mean of $97.69. This places Medicare near the middle of the payer distribution rather than at the low end.

Rate dispersion (P75 minus P25) is widest for UnitedHealth Group and Cigna, reflecting broader variability among allowed amounts; UnitedHealth Group’s interquartile range is $88.80 (183.00 - 94.20) and Cigna’s is $83.50 (178.00 - 94.50). Dispersion is tightest for Medicare, with an interquartile range of $13.00 (117.00 - 104.00), followed by Aetna at $49.67 (113.00 - 63.33). The table and chart below present the full breakdown.