Summary & Overview
CPT 64645: Chemodenervation of Additional Extremity, 5 or More Muscles
CPT code 64645 represents chemodenervation of one extremity, specifically for each additional extremity involving five or more muscles, and is billed as an add-on to the primary procedure. This code is significant in the management of complex neuromuscular conditions, such as dystonia, spasticity, and cerebral palsy, where targeted neurolytic agent injections are required to reduce abnormal muscle activity and improve patient mobility.
Major national payers including Aetna, Blue Cross Blue Shield, Cigna Health, Medicare, and UnitedHealthcare provide coverage for this procedure, reflecting its clinical importance and widespread utilization. The procedure is most commonly performed in an office setting, allowing for efficient patient access and continuity of care.
Readers will gain insight into the clinical indications for chemodenervation, the typical workflow and site of service, and the payer landscape for this code. The publication also covers relevant policy updates, coding benchmarks, and the broader context of chemodenervation procedures within neurology and physical medicine. Understanding CPT 64645 is essential for stakeholders seeking clarity on billing practices, payer coverage, and the evolving role of chemodenervation in treating movement disorders.
CPT Code Overview
CPT 64645 is used to report chemodenervation of one extremity, specifically for each additional extremity involving five or more muscles. This code is listed separately in addition to the primary procedure code. The service type is destruction by neurolytic agent within the nervous system, commonly performed in an office setting (Place of Service 11). Chemodenervation procedures are utilized to manage conditions characterized by abnormal muscle tone or movement, providing targeted relief and improved function for affected extremities.
Clinical & Coding Specifications
Clinical Context
A patient with a neurological condition such as spastic quadriplegic cerebral palsy, hereditary spastic paraplegia, or multiple sclerosis presents to a neurology or physical medicine and rehabilitation clinic. The patient exhibits significant muscle spasticity or dystonia in multiple extremities, affecting five or more muscles in each additional extremity. The provider determines that chemodenervation is indicated to reduce abnormal muscle tone and improve function. The procedure is performed in the office setting, targeting the affected muscles in the additional extremity using a neurolytic agent (e.g., botulinum toxin). Guidance techniques such as needle electromyography or muscle electrical stimulation may be used to ensure accurate injection. The primary procedure is coded with 64644 or 64642, and 64645 is reported for each additional extremity treated (5 or more muscles).
Coding Specifications
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Modifier
95873/95874: Used when needle electromyography or muscle electrical stimulation guidance is performed during chemodenervation. Only one guidance code should be reported per corresponding chemodenervation code. -
Modifier
50: Indicates a bilateral procedure. Modifier50should NOT be reported in conjunction with64645.