Summary & Overview

HCPCS Level II J0476: Intrathecal Baclofen Trial Injection, 50 mcg

HCPCS Level II code J0476 denotes an intrathecal trial injection of baclofen, 50 micrograms, used to evaluate responsiveness to intrathecal therapy prior to permanent pump implantation. Nationally, intrathecal baclofen trials are an important step in managing severe spasticity and inform clinical decisions about invasive neuromodulation and long-term medication delivery.

Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the code’s clinical purpose, typical sites of service, and the payer landscape. The publication summarizes common billing practices, coverage considerations across major payers, and the clinical context for performing an intrathecal trial.

This summary provides benchmarks for utilization and coding clarity, highlights policy elements that influence reimbursement and prior authorization, and outlines what clinicians and billing professionals need to document for claims involving an intrathecal baclofen trial. Data not available in the input regarding associated taxonomies, ICD-10 diagnoses, and related codes will be identified elsewhere in the full publication.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareJ0476HCPCS Level IIintrathecal baclofenspasticity managementintrathecal trialdrug administrationpain managementoutpatient procedures

Billing Code Overview

HCPCS Level II code J0476 represents an injection of baclofen, 50 mcg, for intrathecal trial. This code describes a medication administration intended to assess patient response to intrathecal baclofen before potential implantation of a long-term intrathecal drug delivery system.

Service type: Medication administration for intrathecal trial
Typical site of service: Hospital outpatient department, ambulatory surgical center, or specialized pain management clinic where intrathecal procedures and monitoring are performed.

Clinical & Coding Specifications

Clinical Context

A typical patient is an adult with severe spasticity from multiple sclerosis, spinal cord injury, or cerebral palsy who has not achieved adequate relief from oral antispasmodic medications and physical therapy. The patient is referred to a pain management or neurosurgical clinic for an intrathecal baclofen trial to assess responsiveness before permanent pump implantation. The clinic visit includes pre-procedure consent and medication reconciliation, baseline neurological and objective spasm assessments, and imaging review. On the day of the procedure, the patient is placed in a sterile setting in an ambulatory surgery center or hospital outpatient department. Under fluoroscopic guidance, an intrathecal access needle is placed at a lumbar interspace and a test dose of J0476 (injection, baclofen, 50 mcg for intrathecal trial) is administered. The patient is monitored for reduction in spasticity, changes in muscle tone, and adverse effects (hypotonia, somnolence, respiratory depression) for several hours. If the trial results demonstrate clinically meaningful improvement with acceptable side effects, the care team discusses next steps for intrathecal baclofen pump implantation. Typical sites of service are an ambulatory surgery center (ASC), hospital outpatient department (HOPD), or specialized pain clinic with fluoroscopy capability.

Coding Specifications

Modifier	Description	When to Use
`11`	Normal or typical procedure/service	Use when the service is performed as expected without complication.
`22`	Increased procedural services	Use when substantially greater services are provided than typical for an intrathecal trial.
`23`	Unusual anesthesia	Use if non-routine anesthesia is required for the trial beyond local or minimal sedation.
`52`	Reduced services	Use when the intrathecal trial is partially reduced or not completed.
`53`	Discontinued procedure	Use when the trial is stopped due to patient complication or intolerance before completion.
`62`	Two surgeons	Use when two surgeons of different specialties are required to perform the procedure.
`78`	Return to operating/procedure room for a related procedure during the postoperative period	Use if patient returns emergently for repeat intrathecal access or related intervention.
`80`	Assistant surgeon	Use if a qualified assistant surgeon performs a portion of the procedure.
`82`	Assistant surgeon (when qualified resident not available)	Use when a qualified assistant surgeon is present and a resident is not available.
`AS`	Physician assistant, nurse practitioner, or clinical nurse specialist services for Medicare Beneficiaries	Use when an advanced practice clinician bills under their own NPI for services related to the trial.
`JW`	Drug discarded/not administered	Use when a portion of the supplied baclofen is discarded and must be reported per payer rules.
`JZ`	No drug administered	Use when no drug from a single-use vial was administered (rare for this code) as per reporting rules.
`QX`	Service furnished under a Medicare-approved P/T or O/T plan under supervision of a physician	Use when applicable to supervision rules for certain allied health professionals assisting in the procedure.

Taxonomy Code	Specialty	Notes
`185H00000X`	Physical Medicine & Rehabilitation	PM&R physicians frequently manage spasticity and refer for intrathecal trials.
`208000000X`	Pain Medicine (Anesthesiology)	Pain specialists commonly perform intrathecal baclofen trials under fluoroscopy.
`2084P0122X`	Neurological Surgery	Neurosurgeons evaluate and implant intrathecal pumps following successful trials.
`363A00000X`	Nurse Practitioner	NPs in pain clinics may coordinate care and provide peri-procedural management.
`367500000X`	Physician Assistant	PAs often assist in clinic workflow and peri-procedural care for trials.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G83.4`	Spastic paraplegia	Represents spasticity affecting lower extremities that may be treated with intrathecal baclofen.
`G35`	Multiple sclerosis	MS commonly causes severe spasticity refractory to oral therapy; patients are candidates for intrathecal baclofen trial.
`G82.20`	Paraplegia, unspecified	Patients with paraplegia from spinal cord injury often have disabling spasticity treated with intrathecal baclofen.
`G83.3`	Tetraplegia, unspecified	Quadriplegic patients with generalized spasticity may undergo intrathecal baclofen trials.
`M62.50`	Muscle spasm, unspecified site	Symptomatic muscle spasm that is severe and refractory can be an indication for intrathecal baclofen trial.
`G89.29`	Other chronic pain	Chronic spasticity-related pain may be part of the clinical picture prompting a trial of intrathecal baclofen.
`G44.209`	Chronic tension-type headache, unspecified	Included only when spasticity-related dystonia contributes to refractory head/neck spasm considered for intrathecal therapy.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`62270`	Spinal puncture, lumbar, diagnostic; with imaging guidance (fluoroscopy)	Commonly used for intrathecal access/diagnostic lumbar puncture when image guidance is performed during the trial.
`62321`	Injection(s), of diagnostic or therapeutic substance(s) (e.g., anesthetic, antispasmodic), not including neurolytic substances, including needle or catheter placement, with fluoroscopic guidance; lumbar or sacral, single level	Used when performing a single-level intrathecal injection with fluoroscopic guidance for the baclofen trial.
`99152`	Moderate sedation services provided by the same physician/other qualified health care professional performing the diagnostic or therapeutic service that the sedation supports, for initial 30 minutes	May be billed when moderate sedation is provided during the intrathecal trial (use payer rules to determine appropriateness).
`99284`	Emergency department visit, moderate complexity	May apply if patient presents to ED with complications related to the trial and requires evaluation; included here for workflow context.
`62323`	Injection(s), of diagnostic or therapeutic substance(s), including needle or catheter placement, with fluoroscopic guidance; lumbar or sacral, two or more levels	Used if multiple-level intrathecal injections or catheter placements are performed during the trial.
`96546`	Immunotherapy administration, intrathecal (if applicable for coding drug administration in certain payer guidance)	Occasionally referenced in payer-specific guidance for intrathecal drug administration coding; verify local payer rules.