L4-L5 and L5-S1 Disc Injuries in Illinois Workers’ Comp
An MRI says “L4-L5 disc bulge” or “L5-S1 herniation.” Does that mean your back injury is covered by Illinois workers’ comp? It can be. The MRI is one piece of the case. Your symptoms, examination, work history, treatment, and what changed after the job injury matter just as much.
Disc claims often become contested when leg pain continues, an injection or surgery is recommended, or an insurance doctor calls the finding “degenerative.” This guide explains the medical terms in plain English, how a work injury is proved, what benefits may be at stake, and what our firm’s back-injury cases show about taking a dispute to hearing.
For help with the claim itself, see our Chicago workers’ compensation lawyers. For a fuller discussion of dollar value, use our separate Illinois back injury settlement guide.
Has the insurer blamed your disc injury on degeneration?
Tell us what happened at work, what your MRI shows, and whether treatment or checks have been denied. We can review where the dispute stands.
Disc bulge vs. herniated disc: what the MRI is telling you
A disc sits between the bones of the spine. A bulge generally describes a broader extension of the disc beyond its usual edge. A herniation, sometimes described as a protrusion or extrusion, is a more localized displacement of disc material. Radiology reports use these words with some variation. Neither label, standing alone, tells you whether the injury was caused by work, whether a nerve is affected, or whether surgery is needed.
L4-L5 and L5-S1 are levels in the lower back. A report may also mention an annular tear, spinal canal or foraminal narrowing, or contact with a nerve root. The location of the finding has to be compared with the side and pattern of the worker’s pain, numbness, weakness, and examination. Some people have disc changes on an MRI without serious symptoms. Others have a finding that fits persistent leg pain and loss of function.
What is sciatica or lumbar radiculopathy? It usually refers to pain or other symptoms traveling from the lower back into the buttock and leg when a nerve root is irritated. The doctor may look for sensory changes, weakness, reflex changes, and a matching MRI finding. A diagnosis of “sciatica” alone does not identify which disc or what caused the condition.
Progressive weakness or new bowel or bladder problems call for prompt medical attention. For ordinary claim questions, keep copies of the MRI report, work-status slips, and your doctor’s notes; those records often become central when an insurer disputes the diagnosis.
Can a job cause or aggravate an L4-L5 or L5-S1 disc injury?
Yes. One worker feels a sudden pain lifting a box or patient. Another develops symptoms after repeated lifting, bending, pulling, or twisting. The important question in a claim is whether the work caused or aggravated the condition, supported by the history and medical evidence. A preexisting or degenerative finding does not by itself answer that question.
We look for a clear account of the job duties, when symptoms began or changed, early treatment notes, any earlier back complaints, and the treating doctor’s explanation. If symptoms developed over time, the date and proof issues can be different from a single accident; our repetitive-trauma guide explains that route. Our preexisting-condition guide addresses the “it was already there” defense.
Job demands matter. Repeated lifting at a warehouse, moving patients in healthcare, and handling bags or carts in an airline or airport job can raise different questions about mechanism, restrictions, and return to work. The actual tasks are more useful than the job title alone.
What happens after an MRI shows a disc injury?
Treatment depends on the symptoms, examination, imaging, response to prior care, and the doctor’s judgment. An MRI finding does not mean that every worker needs surgery. Common stages include:
Initial care and restrictions
Medication, physical therapy, modified activity, and a work-status plan may help. The doctor should know what lifting, bending, standing, or driving the job actually requires.
Injections and specialist review
When leg symptoms persist, a specialist may discuss an epidural injection or other care. The response matters: did the pain improve, for how long, and did function or work ability change?
Discectomy or decompression
Some workers with persistent nerve symptoms are evaluated for a microdiscectomy or other decompression procedure. The specific recommendation should be tied to the imaging and clinical findings.
Fusion or later pain treatment
A fusion is considered in selected cases with additional spine problems; it is not the automatic next step after a bulge. Persistent pain after surgery can raise separate questions about further care, including a spinal cord stimulator trial.
Keep the medical question distinct from the claim question. A surgeon decides what treatment is recommended. The insurer may dispute whether that recommendation is reasonable, necessary, or related to work. If care is refused, see what to do after workers’ comp denies surgery.
What if the IME says it was only a strain or a preexisting condition?
An insurance-arranged medical examination can produce a very different opinion from the treating surgeon’s. In a disc case, the dispute may be about whether the work accident aggravated an existing condition, whether the symptoms match the MRI, or whether the proposed treatment is needed. The IME report can affect voluntary benefits, but the examiner does not decide the legal case.
Useful questions include: Did the examiner review the actual MRI images or only the report? Did the examiner know the lifting or twisting involved in the job? Did the report address the annular tear, nerve symptoms, restrictions, and the worker’s condition before the accident? Our IME doctor versus treating doctor guide explains how these opinions are weighed and challenged.
What our back-injury cases show
These are different cases with different medical findings. They illustrate the kinds of evidence and disputes that can arise after a disc injury; none establishes the value or outcome of another worker’s claim.
Aldi distribution center · L4-L5 fusion order
When the IME called it a strain
In a March 2026 Section 19(b) arbitration decision, the defense doctor attributed the worker’s condition to a strain and preexisting spondylosis. The arbitrator credited the treating surgeon’s opinion, found the condition related to work, ordered authorization of an L4-L5 fusion, awarded disputed medical bills, and addressed TTD with credit for payments already made. This was an arbitration ruling on treatment and temporary benefits, not a final permanency award. Read the Aldi back-surgery trial account.
Southwest Airlines · lumbar fusion trial
When settlement terms included resignation
Our published account describes a flight attendant with a serious lumbar injury requiring fusion. The case was tried in Illinois after Southwest conditioned settlement on resignation, and the reported workers’ compensation award was about $100,000. It is an example of a contested lumbar case, not a benchmark for an L4-L5 or L5-S1 disc claim. Read the Southwest flight-attendant case account.
Persistent low-back and leg pain · SCS trial
When later treatment was disputed
In a separate arbitration-level decision, our firm obtained authorization for a temporary spinal cord stimulator trial after an IME dispute, along with rulings on medical bills and TTD. It did not automatically approve a permanent implant or resolve future permanency. Read the SCS trial result.
Factory worker · settlement
When a back injury ended a career
Our firm reports a $906,000 workers’ compensation settlement for a factory worker with a career-ending back injury and surgery. That was a settlement, not a trial award, and the work and wage consequences were central. See our workers’ compensation results.
Prior results do not guarantee a similar outcome. Each case depends on its medical evidence, wages, work restrictions, disputed issues, and procedural history. The Southwest result is described in the firm’s published case account.
Back surgery denied, or checks stopped after an IME?
Our Chicago workers’ compensation lawyers can review the medical opinions, work restrictions, and insurer’s reason for denial and explain whether the claim should be prepared for a hearing.
What benefits may be available while a disc claim is treated?
| Issue | What may be involved |
|---|---|
| Medical care | Reasonable and necessary care related to the work injury, which may include imaging, therapy, injections, surgery, and follow-up. |
| Time away from work | Temporary total disability (TTD) may apply while the worker cannot work under the medical restrictions and otherwise qualifies. |
| Lower earnings on restricted work | Temporary partial disability (TPD) may apply when suitable work pays less during recovery. |
| Lasting loss after treatment | Permanent disability, vocational rehabilitation, or wage-differential issues may arise if restrictions remain and the worker cannot return to the former job or earnings. |
The category and amount depend on the facts. Our Illinois benefits guide explains the available benefits; the TTD, TPD, and average weekly wage guide addresses check calculations. If checks have already stopped, start with the stopped-checks guide.
Can you work light duty with a herniated disc?
Sometimes, but the answer has to start with the doctor’s actual restrictions and the work the employer offers. A nominal “light-duty” assignment can still require lifting, bending, long periods on your feet, or other tasks outside those limits. Put the job offer and medical restrictions side by side, and ask the treating doctor to address any mismatch. Our Illinois light-duty guide covers temporary assignments. If restrictions become permanent, read what happens when you cannot return to your old job.
What is an L4-L5 or L5-S1 disc injury case worth?
There is no responsible dollar figure from the MRI phrase alone. Two people with the same reported disc level may have very different symptoms, treatment, wages, jobs, recovery, and ability to work. An injection or surgery is relevant evidence, but it does not create an automatic settlement bracket.
The questions that usually move value are whether the work connection can be proved, what treatment was needed and may be needed later, how long the worker was off, the average weekly wage, permanent restrictions, and whether the person can return to the same occupation or earnings. A settlement can also close future medical rights, so its terms matter alongside the amount. The back injury value guide goes deeper; our settlement chart explanation shows why a chart is only a starting point.
When should you call a lawyer about a disc injury?
It is especially useful to get advice when the MRI and symptoms do not line up with what the insurer is saying, an IME calls the injury preexisting, an injection or surgery is denied, checks stop, a proposed light-duty job violates restrictions, or a settlement is offered before future care and work capacity are clear. The Illinois workers’ comp hearing guide explains what happens if a medical or benefit dispute must be decided by an arbitrator.
McHargue & Jones represents injured workers from its Chicago Loop office throughout Cook County and Illinois. Our main workers’ compensation page explains how we handle denied treatment, stopped checks, IMEs, and contested cases.
Tell us what the MRI says—and what happened at work
We offer a free review of Illinois workers’ compensation disc claims. You can send a message below or call the office directly. No attorney fee unless we recover for you. Se habla español.
Frequently asked questions about disc injuries at work
Can I get Illinois workers’ comp for a disc bulge without a single accident?
Possibly. Repeated work activity can cause or aggravate a condition, but the history, timing, job duties, and medical opinions must support the claim. Repetitive-trauma cases can raise different notice and accident-date issues.
Does “degenerative disc disease” on my MRI defeat the claim?
No automatic rule does that. The dispute is whether work caused or aggravated the condition and need for treatment. Prior symptoms, the change after work activity, imaging, and the treating doctor’s reasoning all matter.
Is a bulge less serious than a herniation for workers’ comp?
The terminology can describe different imaging patterns, but the label is not a severity score or a case-value formula. A worker’s symptoms, nerve findings, treatment, restrictions, and ability to work are more useful.
Can an L5-S1 herniation cause sciatica and numbness in the foot?
It can, depending on which nerve is affected. The treating clinician should compare the exact imaging location with the worker’s symptoms and examination; other causes of leg symptoms may also need evaluation.
Will workers’ comp pay for a microdiscectomy or fusion?
It may have to pay when the proposed surgery is reasonably required for a covered work injury. The recommendation, medical records, causation evidence, and any contrary IME opinion can become the subject of a dispute or hearing.
Does having back surgery mean a six-figure settlement?
No. Surgery can be important, but wages, permanent restrictions, future medical care, return-to-work prospects, and the strength of the work-relatedness evidence can change the outcome substantially.
Can a hearing get denied back surgery approved?
In an appropriate case, a Section 19(b) hearing can address disputed prospective medical care and temporary benefits. The Aldi L4-L5 fusion ruling above is one example of an arbitration-level order, not a promise of the same result in another case.
For general background beyond this firm’s guides, see the Illinois Workers’ Compensation Commission handbook and the American Academy of Orthopaedic Surgeons’ herniated-disk overview.
This page provides general information, not medical or legal advice for a particular claim. Treatment decisions belong with your clinician. Every workers’ compensation case depends on its own evidence and procedural status.
