Written and maintained by CASRAI Editorial Board
Last updated
This page describes products and general use; it is not medical advice.
An LSO brace (lumbar-sacral orthosis) is a rigid or semi-rigid back support that covers the lower spine and sacrum. Clinic staff, buyers and students use this page to learn the product class: how it is built, how Medicare’s product vocabulary sorts the types, and how one manufacturer’s instructions for use (IFU) describe fitting.
What an LSO brace is
LSO stands for lumbar-sacral orthosis. The Centers for Medicare & Medicaid Services (CMS) describes a spinal orthosis as “a rigid or semi-rigid device, used to support a weak or deformed body member,” which may restrict or end motion in a diseased or injured body part. Medicare’s spinal orthoses benefit covers LSOs and thoracic-lumbar-sacral orthoses (TLSOs) (CMS Medicare Learning Network, Spinal Orthoses compliance tip, checked 2026-10-30).
Who uses it: people whose clinician has ordered a back orthosis, and the clinic, orthotics and supply staff who stock, fit and document it.
How an LSO is built
CMS coding language describes some LSOs as having “rigid anterior and posterior panels” (example code L0631). One manufacturer’s IFU, for the AspenLSO, describes a back panel with aluminum rods that can be bent to match the wearer’s lordotic curve, a centre strap 1.5 in wide that passes through a lever-type latch, and upper and lower straps that are tightened to close the brace (Aspen Medical Products IFU LS0014M, checked 2026-10-30). Other products are built differently; treat these as one product’s description, not a universal parts list.
Types and variants
Medicare policy sorts braces by how much fitting they need and who may do it. The terms below come from CMS policy article A52500 (checked 2026-10-30), plus the rigid/semi-rigid and LSO/TLSO wording from the CMS compliance tip.
| Type | What the source says | Key difference |
|---|---|---|
| Prefabricated | A prefabricated orthosis is “manufactured in quantity without a specific beneficiary in mind.” (CMS A52500) | Umbrella term for the next two rows |
| Prefabricated, off-the-shelf (OTS) | Prefabricated and needs only minimal self-adjustment at delivery, with no specialized fitting expertise. (CMS A52500) | “Minimal self-adjustment” is an adjustment the beneficiary, a caretaker or the supplier can perform |
| Prefabricated, custom fitted | Prefabricated but needs more than minimal self-adjustment at delivery, requiring a certified orthotist or a specially trained individual. (CMS A52500) | Needs trained fitting |
| Custom fabricated | “Individually made for a specific patient.” (CMS A52500) | Made for one person rather than in quantity |
| Rigid or semi-rigid | CMS defines the orthosis class as a “rigid or semi-rigid device.” (CMS compliance tip) | Describes stiffness of the device |
| LSO vs TLSO | Both are covered under the spinal orthoses benefit. (CMS compliance tip) | A TLSO is a thoracic-lumbar-sacral orthosis, so it extends higher on the trunk than an LSO |
For billing and coding, Medicare treats off-the-shelf and custom-fitted items as prefabricated braces (CMS compliance tip). This is US Medicare vocabulary and does not apply in every country or payer.
How fitting works (one manufacturer’s IFU)
The AspenLSO IFU (checked 2026-10-30) describes the fit logic for that product in general terms. Size is chosen by matching the patient’s height and girth. The location and amount of lordotic curve are noted against the back panel, and the aluminum rods can be bent to suit. The average of waist and lower-rib circumference sets the rivet position in the adjustment openings, and the back panel is centred on the back with the upper and lower straps tightened. Fitting is done by trained staff following the IFU of the actual device.
The IFU states that proper fitting is required for the product to be effective and that proper training in its use should take place before it is applied. Another product’s IFU may differ, so the instructions that come with the actual device govern.
When Medicare covers an LSO
CMS Local Coverage Determination L33790, “Spinal Orthoses: TLSO and LSO” (checked 2026-10-30), lists codes L0648, L0649, L0650 and L0651 among the covered spinal orthoses when ordered for one of these indications:
- To reduce pain by restricting mobility of the trunk.
- To facilitate healing following an injury to the spine or related soft tissues.
- To facilitate healing following a surgical procedure on the spine or related soft tissue.
- To otherwise support weak spinal muscles and/or a deformed spine.
This is a US Medicare coverage rule, not a general clinical standard, and it does not say which brace suits which person.
Safe use and handling basics
From the AspenLSO IFU, for that product:
- Contraindications include hypersensitivity or allergy to any of the materials, swelling of lymphatic tissue from circulatory disorders, and patients who are not allowed to wear a brace according to medical instructions.
- Care: hand wash only at 30 C with mild detergent, air dry, and do not use bleach or other chemicals.
- The IFU says the device may be prescribed by a physician. Any decision about wearing one belongs to the person’s clinician.
Common mistakes
- Skipping training: the IFU says proper training should take place before the device is applied.
- Poor fit: the IFU says proper fitting is required for the product to be effective.
- Washing against the instructions: the IFU specifies hand washing, mild detergent and air drying, with no bleach or chemicals.
- Treating Medicare terms as product grades: OTS, custom fitted and custom fabricated describe fitting and manufacture, not quality.
FAQ
What does LSO stand for?
Lumbar-sacral orthosis, a spinal orthosis covering the lower back and sacrum. Medicare’s spinal orthoses benefit covers LSOs and TLSOs.
Is an LSO brace rigid?
CMS defines the spinal orthosis class as a rigid or semi-rigid device. Individual products vary, and one manufacturer’s IFU describes bendable aluminum rods in the back panel.
What is the difference between an LSO and a TLSO?
An LSO covers the lumbar and sacral regions; a TLSO also covers the thoracic region. Both fall under the same Medicare spinal orthoses benefit.
What is the difference between off-the-shelf and custom-fitted?
Per CMS A52500, off-the-shelf items need only minimal self-adjustment and no specialized fitting expertise. Custom-fitted items need more adjustment, performed by a certified orthotist or specially trained individual.
Related guides
See also sacroiliac belts, hip braces, cervical collars, walking boot sizing and elastic bandages.
Sources
- CMS, Local Coverage Determination L33790, Spinal Orthoses: TLSO and LSO, https://www.cms.gov/medicare-coverage-database/view/lcd.aspx?lcdId=33790&ver=20 (checked 2026-10-30).
- CMS, Policy Article A52500, https://www.cms.gov/medicare-coverage-database/details/article-details.aspx?articleId=52500 (checked 2026-10-30).
- CMS Medicare Learning Network, Spinal Orthoses provider compliance tip, https://www.cms.gov/training-education/medicare-learning-networkr-mln/compliance/medicare-provider-compliance-tips/spinal-orthoses (checked 2026-10-30).
- Aspen Medical Products, AspenLSO instructions for use (LS0014M), https://aspenmp.com/cdn/shop/files/LS0014M_AspenLSO_IFU_16_Lang_04-10-23.pdf (checked 2026-10-30).
