The Adjuster Says Your Injury Was Pre-Existing. Now What?

A claims adjuster says your injury was “pre-existing.” That can feel like the whole case just got shoved off a cliff.

It usually has not.

In California workers' compensation, the real question is not whether your body had a history. Almost everyone has a history. The question is whether your job caused, aggravated, accelerated, or lit up the condition enough to require medical treatment, work restrictions, disability payments, or a permanent-disability evaluation.

That difference matters. A prior bad back, old knee injury, shoulder surgery, carpal tunnel symptoms, arthritis, or years of wear and tear may become a workers' comp issue if work made it worse.

“Pre-Existing” Is Not a Magic Word

Insurance companies like clean labels. “Pre-existing” sounds final. It sounds medical. It sounds like the adjuster found the trap door.

But the label by itself does not answer the claim.

A worker may have had an old condition and still suffer a new work injury. A job may worsen a prior condition. Repetitive duties may turn mild symptoms into disabling symptoms. A fall, lift, twist, shift, tool, route, patient transfer, delivery load, or warehouse pace may push a condition from manageable to serious.

The claim usually turns on medical evidence and timing:

• What did you feel before the work event or repetitive duties?
• What changed after work aggravated the condition?
• What did you report to the employer?
• What did you tell the first treating doctor?
• What restrictions did the doctor write?
• What records show the before-and-after difference?

What the Carrier Is Really Arguing

When an adjuster points to a prior condition, they may be trying to argue one of several things:

1. No work injury happened. The carrier may say your symptoms are entirely from an old condition.
2. Work only caused a temporary flare-up. They may accept short treatment but fight longer care or disability.
3. Another employer or time period is responsible. This comes up in cumulative trauma claims or workers with several physically demanding jobs.
4. Permanent disability should be reduced. In some cases, doctors discuss apportionment, meaning what portion of permanent disability is linked to industrial versus non-industrial causes.
5. Treatment is not related to this claim. The insurer may deny surgery, imaging, therapy, injections, or medication by pointing to older records.

Those are different arguments. Do not answer all of them with the same vague sentence. The record has to be built around the exact dispute.

Your Medical History Can Help You, Not Just Hurt You

A prior medical record is not automatically bad. Sometimes it helps.

Old records can show:

• you were working full duty before the new incident;
• symptoms were mild, controlled, or different before the work injury;
• the body part got worse after a specific job duty or accident;
• imaging changed after the work event;
• treatment increased only after the workplace aggravation;
• doctors documented a new restriction, diagnosis, or need for care.

The worst move is pretending the prior condition does not exist. If the carrier finds it later, they will use the omission to attack credibility. A better approach is to be accurate: what existed before, what changed, and why work matters now.

What to Tell the Doctor

Do not walk into the clinic and say only, “my back hurts.” That leaves the doctor guessing and gives the adjuster room to rewrite the story.

Explain the work connection clearly:

• what job task, incident, shift pattern, route, machine, patient transfer, lift, fall, or repetitive motion made symptoms worse;
• what symptoms existed before, if any;
• what changed after the work event or work pattern;
• whether pain, numbness, weakness, range of motion, sleep, walking, gripping, lifting, standing, or driving changed;
• whether you kept working through pain before finally reporting it;
• whether the employer changed your duties, speed, staffing, workload, or equipment.

Doctors cannot write useful reports if they never hear the work facts.

Records to Save When “Pre-Existing” Gets Thrown at You

Build a clean file before the argument hardens:

1. Prior medical records. Do not hide them. Get copies and understand what they actually say.
2. Current medical records. Save urgent care, clinic, specialist, imaging, therapy, medication, and work-status notes.
3. Work-status slips. These show restrictions and disability dates.
4. Job-duty proof. Photos, task lists, schedules, route logs, production quotas, patient-transfer notes, or tool/equipment details.
5. Incident reports and DWC-1 paperwork. These anchor the timeline.
6. Witness names. Co-workers may confirm the event, workload, or change in your symptoms.
7. Before-and-after evidence. Schedules, texts, performance notes, gym/activity changes, missed shifts, or messages showing what you could do before versus after.
8. Denial letters and UR/IMR notices. If treatment is denied as “not related,” save the full notice.

A pre-existing-condition fight is usually a timeline fight. Paper beats memory.

Be Careful With Social Media and Casual Statements

If the insurer is arguing your condition was already there, assume they will look for anything that makes the injury seem unrelated to work.

That does not mean you have to disappear from life. It means you should stop posting content that can be twisted out of context. A weekend photo, joke, gym clip, side job, or “I’m fine” text can become an exhibit when the carrier is looking for a way to blame something else.

Also be careful with casual medical-history answers. “I have always had a bad back” may be true in conversation, but legally useless if it does not explain what changed after work.

When a QME or AME Gets Involved

Pre-existing-condition disputes often end up in a medical-legal evaluation. A QME or AME may be asked whether the injury is industrial, what treatment is reasonable, whether you are permanent and stationary, and whether any permanent disability should be apportioned.

That makes preparation important. The evaluator may review old records, new records, job descriptions, imaging, and your explanation of symptoms. If the record is incomplete or the work duties are vague, the report may miss the real mechanism of injury.

Before a QME or AME exam, organize:

• prior records;
• current treatment records;
• diagnostic imaging;
• job-duty details;
• work restrictions;
• a clear symptom timeline.

Accuracy matters more than drama.

Talk to WCLG Before the Carrier Controls the Story

If an adjuster says your work injury was pre-existing, do not treat that as the final answer. It may be a real medical issue, a legal dispute, or a carrier shortcut. The difference matters.

Workers' Compensation Law Group helps injured workers in Downey, the Gateway Cities, Los Angeles County, and across California understand what records matter, what medical questions need answering, and how to protect treatment and wage benefits when the carrier blames an old condition. Contact WCLG for a free consultation about your specific situation.