Summary & Overview
CPT 64646: Chemodenervation of 1‑5 Trunk Muscles
CPT code 64646 represents chemodenervation of 1‑5 trunk muscles, a procedure frequently used to manage spasticity and dystonia in patients with neurological and musculoskeletal disorders. This intervention is performed by specialists in Physical Medicine & Rehabilitation, Neurology, and Pain Medicine, and is typically delivered in outpatient hospital or physician office settings. The code is recognized by major national payers, including Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare, ensuring broad coverage for eligible patients.
This publication provides a comprehensive overview of CPT 64646, including its clinical indications, payer coverage, and relevant policy updates. Readers will gain insight into the procedure’s role in treating conditions such as multiple sclerosis, cerebral palsy, and various forms of dystonia, as reflected in associated ICD-10 diagnoses. The article also highlights related CPT codes for chemodenervation procedures, common billing modifiers, and the specialties most frequently involved in delivering this service. Benchmarks and policy considerations are discussed to inform stakeholders about current trends and requirements for reimbursement and compliance. The summary is designed for a national audience, offering clarity on the clinical and administrative aspects of CPT 64646.
CPT Code Overview
CPT 64646 is used to report chemodenervation of trunk muscle(s); 1‑5 muscle(s). This procedure involves the injection of agents such as botulinum toxin to reduce abnormal muscle activity in the trunk, commonly performed for conditions resulting in spasticity or dystonia. The service is typically provided by specialists in Physical Medicine & Rehabilitation, Physical Therapy, or Neurology. The most common sites of service for this procedure are the outpatient hospital or physician office settings, corresponding to place of service codes 22 and 11.
Clinical & Coding Specifications
Clinical Context
A typical patient scenario involves an adult with spasticity or dystonia affecting the trunk muscles, such as a patient with multiple sclerosis, cerebral palsy, or paraplegia. The patient is referred to a neurologist, physical medicine & rehabilitation physician, or pain medicine physician for management of muscle overactivity. After clinical assessment, the provider determines that chemodenervation (e.g., botulinum toxin injection) of 1-5 trunk muscles is indicated to reduce spasticity, improve mobility, or decrease pain. The procedure is performed in an outpatient hospital or physician office setting. Documentation includes the number of muscles treated, the indication for chemodenervation, and the response to prior therapies.
Coding Specifications
-
Modifier
50(Bilateral Procedure): Used when chemodenervation is performed on trunk muscles bilaterally. -
Modifier
59(Distinct Procedural Service): Used when chemodenervation is performed as a distinct service from other procedures, such as injections in different anatomical regions.
| Provider Taxonomy Code | Specialty |
|---|---|
2084N0400X |