Straight from the CPT book Guidelines:
Application of Casts and Strapping
The listed procedures apply when the cast application or strapping is a replacement procedure used during or after the period of follow-up care, or when the cast application or strapping is an initial service performed without a restorative treatment or procedure(s) to stabilize or protect a fracture, injury, or dislocation and/or to afford comfort to a patient. Restorative treatment or procedure(s) rendered by another physician following the application of the initial cast/splint/strap may be reported with a treatment of fracture and/or dislocation code.
A physician who applies the initial cast, strap or splint and also assumes all of the subsequent fracture, dislocation, or injury care cannot use the application of casts and strapping codes as an initial service, since the first cast/splint or strap application is included in the treatment of fracture and/or dislocation codes. (See notes under Musculoskeletal System, page 75.) A temporary cast/splint/strap is not considered to be part of the preoperative care, and the use of the modifier 56 is not applicable. Additional evaluation and management services are reportable only if significant identifiable further services are provided at the time of the cast application or strapping.
If cast application or strapping is provided as an initial service (eg, casting of a sprained ankle or knee) in which no other procedure or treatment (eg, surgical repair, reduction of a fracture, or joint dislocation) is performed or is expected to be performed by a physician rendering the initial care only, use the casting, strapping and/or supply code (99070) in addition to an evaluation and management code as appropriate.
Listed procedures include removal of cast or strapping.
Diana Wilson, CPC. CPMA, CPC-I