HCPCS Code L0642: Lumbar Orthosis, Sagittal Control, With Rigid Anterior and Posterior Panels

Prefabricated ones, such as the one designated by this HCPCS code, means that they're pre-made and can be obtained off-the-shelf (it is readily available). These cannot really be customized. It can be mildly adjusted to fit the patient and to accommodate specific add-ons. Custom-fitted orthotics need to be made first, based on the measurements and assessments of the provider. They need to determine how the orthotic needs to be trimmed, bent, molded, assembled, or otherwise customized to suit the patient's specific needs.

It shouldn't take longer than 30 minutes.

Yes. If the orthosis isn't properly fitted, the patient will feel prolonged discomfort way past the adjustment phase. Prolonged use will lead to skin irritation, the development of pressure sores, impaired circulation in the lumbar area, and nerve compression.