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- DRE or Range of Motion? A multi-level fusion takes the case out of the DRE method entirely — the Guides require ROM. A two-level fusion rated as “DRE V, 28%” is very likely under-rated, and it is checkable on the face of the document.
- Every DRE category is a range, not a number. A report that says “DRE II, 5% WPIWPI — Whole Person Impairment The percentage from the AMA Guides that a rating is built from. Extremity percent is not whole person percent: 100% upper extremity = 60% whole person, 100% lower extremity = 40%. This is the most common source of confusion in a rating.” without discussing your daily activities has left three points on the table — and those points survive every downstream multiplier.
- “Degenerative disc disease” is the most common defense argument in the system. Under EscobedoEscobedo The en banc decision requiring an apportionment opinion to explain how and why. A percentage without reasoning is not substantial evidence. the physician must explain how and why; a pathology plus a percentage is not substantial evidenceSubstantial evidence The standard a medical opinion must meet to support a finding..
Most of what decides a back case is checkable on paper: which method the evaluator used, whether the category range was applied or just the floor, whether the apportionmentApportionment Dividing permanent disability between industrial and non-industrial causes. It is to disability, not to findings on an image. opinion contains actual reasoning, and whether a multi-level surgery was rated the way the Guides require.
How your back gets rated
Impairment is measured under Chapter 15 of the AMA Guides, 5th Edition. There are two methods. The DRE method is the default for a distinct injury: the evaluator places you in one of five categories based on clinical findings — what the examination shows, not what the MRI shows.
| DRE CATEGORY · IMPAIRMENT | WHAT IT TAKES |
|---|---|
| I · 0% | No significant clinical findings, no muscle guarding or spasm, no documented neurologic impairment |
| II · 5–8% | Findings compatible with a specific injury — significant guarding or spasm observed at the exam, asymmetric loss of motion, or radicular complaints that cannot be verified |
| III · 10–13% | Verified radiculopathy — dermatomal pain or sensory loss, loss of a relevant reflex, loss of muscle strength, or measured atrophy |
| IV · 20–23% | Loss of motion segment integrity — including a fusion — or multi-level neurologic compromise |
| V · 25–28% | Both radiculopathy and loss of motion segment integrity |
| ONE INJURY, TWO METHODS | RATED AS DRE V | RATED BY ROM |
|---|---|---|
| Two-level fusion at L4-5 and L5-S1, residual radiculopathy | 25–28% impairment — except a multi-level fusion should not have been rated by DRE at all | Fused spine measures badly on motion, plus operated stenosis, plus each additional level, plus sensory and motor deficit — routinely mid-thirties to low forties |
| For a 45-year-old warehouse worker | ≈ a $50,000 case | ≈ a $100,000 case |
THE NEGATIVE RULE THAT MATTERS JUST AS MUCH
Multi-level disc bulges alone do not trigger ROM. Multi-level degenerative disc disease alone does not trigger ROM. Multi-level herniations without multi-level radiculopathy do not trigger ROM. An MRI reading “multilevel degenerative changes” does not get you the ROM method. Surgery, fracture, or multi-level radiculopathy does.
WHY ROM USUALLY PRODUCES A LARGER NUMBER
It stacks three components: measured motion loss, plus an additional value for the specific spinal disorder — fracture, soft tissue lesion, operated stenosis — plus sensory and motor nerve deficits rated separately. When both methods genuinely apply, the higher rating governs.
ONE PATHWAY THAT GETS MISSED ENTIRELY
Where there is spinal cord or cauda equina involvement rather than nerve root involvement, Chapter 15 provides a separate rating route covering bladder, bowel, and sexual function, along with gait and upper extremity function. Workers with cauda equina symptoms after a disc extrusion are routinely rated on the DRE scale and never asked. If that describes you, raise it.
Notice that every category is a range, not a number. DRE II is 5 to 8 percent. The spread inside the category is assigned by how much the injury affects your activities of daily living. A report that says “DRE II, 5% WPI” without discussing your daily activities has left three points on the table.
The Guides require the ROM method — not merely permit it — in specific circumstances: fractures at more than one level; radiculopathy bilaterally or at multiple levels in the same region; multi-level alteration of motion segment integrity, which includes a multi-level fusion; recurrent herniation or stenosis with radiculopathy, or recurrent radiculopathy at the same level; and impairment not caused by an injury.
What a rating actually looks like
A DRE-rated back produces a string beginning 15.03.01.00 — Chapter 15 (Spine), region 03 (Lumbar), method 01 (DRE). A ROM-rated back usually produces several strings on the rating form — one for motion loss, one for the specific disorder, one for sensory deficit, one for motor deficit — which are then combined.
So a worker who receives a single-line DRE string after a two-level fusion has a visible problem on the face of the document. You do not need a medical degree to see it.
Why your MRI got denied
Not because the adjusterClaims administrator / adjuster The person handling your claim for the insurer or self-insured employer. thinks you are faking. Because the treatment guidelines set thresholds and utilization reviewUR Utilization Review. The process that approves, modifies, or denies each treatment request. A modification is a denial of what it left out. applies them mechanically.
| REQUEST | WHAT THE GUIDELINE SAYS |
|---|---|
| X-ray in the first 4–6 weeks, no red flags | Not recommended |
| MRI in the first six weeks | Only for progressive neurologic deficit, cauda equina syndrome, a cancer history, persistent fever with elevated inflammatory markers, or an atypical presentation |
| MRI at 4–6 weeks or later for radicular pain | Recommended where symptoms are not improving and surgery is being considered |
| Repeat MRI without a clinical change | Not recommended — the most common imaging denial |
| Discography | Strongly not recommended |
| EMG / nerve conduction | Recommended where imaging is equivocal and there is ongoing neurologic pain — generally unhelpful in the first month |
| Discectomy | Requires all three of: radicular pain with matching exam findings, imaging confirming compression at the predicted level, and 4–6 weeks of failed conservative care including anti-inflammatories |
| Decompression for stenosis | After 4–6 weeks of failed non-operative care; fusion has no role in treating stenosis |
| Fusion for chronic non-specific back pain | Not recommended — worse outcomes than rehabilitation, specifically in workers’ compensation populations |
| Fusion for spondylolisthesis | Recommended, with documented instability on imaging |
| Spinal cord stimulator | Documented chronic radiculopathy with electrodiagnostics, failed prior surgery, six months of functional restoration, an independent psychological evaluation, and a successful trial |
| Epidural injections | Select circumstances after an anti-inflammatory trial — and there should not be a series. Each one’s effect must be assessed before the next |
That single sentence about series is the basis for most epidural denials in California, because the request is written for a series. A psychological evaluation before back surgery in chronic pain is also recommended by the guidelines — workers are routinely blindsided by this. The fix in nearly every case is a request that either documents a red flag or documents the four to six weeks of failed conservative care with dates.
The apportionment fight
THE OPINION THAT ALWAYS READS THE SAME WAY
“MRI demonstrates multilevel degenerative disc disease with disc desiccation at L4-5 and L5-S1, findings which are age-appropriate and pre-existed the industrial injury. I apportion 50% of the permanent disabilityPD Permanent Disability. Compensation for lasting impairment. A different and much lower weekly rate — 2026 maximum $290/week. to the pre-existing degenerative process.”
IT STATES A CONCLUSION, NOT AN ANALYSIS
Under Escobedo, the physician must explain how and why the non-industrial factor caused the percentage assigned. A pathology plus a number is not reasoning, and a percentage without reasoning is not substantial evidence.
IT APPORTIONS THE WRONG THING
The statute apportions permanent disability — not injury, and not pathology. In City of Jackson, the appellate court approved an apportionment opinion specifically because the doctor apportioned disability causation, not injury causation.
DEGENERATION ON AN MRI IS NOT PROOF OF CONTRIBUTION
We will be straight with you: City of Petaluma v. WCABWCAB Workers’ Compensation Appeals Board. The court system that decides these cases. 23 district offices statewide. (Lindh) is not a helpful decision for injured workers, and an asymptomatic pre-existing condition can support apportionment. But Lindh requires that the disability result from both causes. Nearly every adult over forty has degenerative changes on a lumbar MRI and no disability whatsoever.
THE EVALUATOR HAS TO HAVE DONE THE WORK
Did they review pre-injury records? Any prior treatment, complaint, or lost time? Were you working full duty the day before? What is the medical basis for 50% rather than 20%? In City of Jackson the opinion survived because the physician cited specific literature. An evaluator who cites nothing has a materially weaker opinion.
Two more things worth knowing. Where there is a prior award of permanent disability, the law conclusively presumes that the prior disability still exists at the time of the new injury — but the defendant bears the burden of proving the prior award and the overlap. And where part of your disability comes from failed back surgery — a fusion that did not take, adjacent segment failure, post-laminectomy syndrome — there is a real argument under Hikida against apportioning that portion. But County of Santa Clara v. WCAB (Justice) (2020) 49 Cal.App.5th 605 holds that Hikida “precludes apportionment only where the industrial medical treatment is the sole cause of the permanent disability,” so where the degenerative spine also contributes, apportionment still applies.
What surgery does to your rating
This surprises people, and it should be understood before you decide.
| PROCEDURE | EFFECT ON THE RATING |
|---|---|
| Discectomy or decompression alone | Does not alter motion segment integrity. If the radiculopathy resolves, you may drop to DRE II — 5 to 8 percent. If it persists, DRE III. A successful discectomy can lower your rating |
| Single-level fusion | Loss of motion segment integrity: DRE IV, 20 to 23 percent — or DRE V, 25 to 28, with residual radiculopathy |
| Multi-level fusion | Takes the case out of DRE entirely and requires the ROM method. The most valuable rule in a California back case and the most frequently missed |
| Hardware failure, pseudarthrosis, adjacent segment disease | Each supports the ROM method — and the argument against apportioning treatment-caused disability |
| DRE plainly understates what happened | Under Almaraz/Guzman a physician may give the strict rating, explain why it fails, and provide an alternate ROM rating — a comparatively strong argument because it stays inside the same chapter |
The jobs that cause it
Low back cumulative traumaCT — Cumulative trauma Injury from repeated exposure over time. The largest injury category in California and the least claimed. clusters where the work combines sustained bending, repetitive lifting from below knee height, twisting under load, and whole-body vibration: warehouse and order picking; nursing, CNA, home health, and patient transport — patient handling is the highest-force manual handling in the economy; construction, framing, drywall, and concrete; delivery and route driving; agricultural field work; housekeeping and janitorial; grocery stocking; baggage handling.
If your back got worse over years rather than in one moment, that is a cumulative trauma claim — and the date of injuryDate of injury For a cumulative or occupational disease claim, the law sets it as when you first suffered disability and knew or should have known it was work-related — not when the wear began. Almost every deadline runs off this. analysis is what determines whether it is timely, which employer pays, and what benefit rates apply.
Seven common mistakes about low-back ratings
- “Your MRI shows a herniated disc, so you have a rating.” — No. DRE placement requires clinical findings, not imaging. A herniation with a normal neurologic exam and no observed guarding is DRE I — zero percent.
- “Surgery increases your settlement.” — Not automatically, and sometimes the reverse.
- “Multi-level degenerative disc disease means you get the ROM method.” — Flatly wrong, and the most common false-hope error in this category.
- Treating a category as a single number — DRE II is 5 to 8 percent, not 5.
- Treating impairment and disability as the same thing — They are not. In the state’s own published example, 8% whole person impairment became 15% permanent disability.
- Ignoring the measurement validity rules — A ROM rating built on measurements that fail the consistency requirements is not a rating at all. Inconsistent effort produces an invalid measurement, not a higher number.
- Believing Lindh helped injured workers — It did not.
Frequently asked questions
My MRI shows a herniated disc. What’s my rating?
Possibly zero. Category placement depends on the clinical examination — reflexes, strength, sensation, observed guarding — not on the imaging.
I had a two-level fusion. What should my rating be?
It should have been rated by the Range of Motion method, not DRE. If your rating stringRating string The row of numbers encoding your entire permanent disability calculation. Checkable arithmetic. is a single DRE line, that is worth checking.
Will surgery increase my settlement?
Sometimes, sometimes not. A successful discectomy that resolves radiculopathy can lower the rating.
They denied my MRI.
Usually because the guideline sets a four-to-six week conservative care threshold absent red flags. The fix is documenting either the red flag or the failed conservative care with dates.
They denied my epidural.
Usually because it was requested as a series. The guideline requires each injection’s effect to be assessed before the next.
They say half my disability is from arthritis.
That is an apportionment opinion, and it has to explain how and why — not just name a pathology and attach a number.
My back hurt for years before it gave out.
That is a cumulative trauma injury, fully compensable, and the date-of-injury analysis matters enormously.
Sources
AMA Guides to the Evaluation of Permanent Impairment, 5th Edition, ch. 152005 California Permanent Disability Rating ScheduleMTUS Low Back Disorders Guideline (ACOEM, February 13, 2020; in effect since November 23, 2021, 8 CCR § 9792.23.5)ACOEM Invasive Treatments and Diagnostic Tests for Low Back DisordersLabor Code § 4660.1§ 4663§ 4664Escobedo v. Marshalls (WCAB en banc)City of Jackson v. WCAB (2017)City of Petaluma v. WCAB (Lindh) (2018) 29 Cal.App.5th 1175Almaraz/Guzman II (WCAB en banc)Hikida v. WCAB (2017)County of Santa Clara v. WCAB (Justice) (2020) 49 Cal.App.5th 605§ 4664(b).
General information about California law, not legal advice about your case.
Impairment values described are from the AMA Guides, 5th Edition as applied under the California rating schedule; the Guides are a copyrighted medical text and figures here are summarized rather than reproduced. Your rating depends on your own examination findings.
Reviewed by Jamey Teitell, Partner & Trial Attorney · Last reviewed
Law Offices of Solov & Teitell, APC · (213) 380-9310
Printed from https://www.solovteitell.com/injuries/low-back/ · Last reviewed