Injection(s), including indwelling catheter placement,
continuous infusion or intermittent bolus, of diagnostic or
therapeutic substance(s) (eg, anesthetic, antispasmodic,
opioid, steroid, other solution), not including neurolytic
substances, interlaminar epidural or subarachnoid, lumbar
or sacral (caudal); with imaging guidance (ie, fluoroscopy or CT)