How Pre-Existing Conditions Affect Workers’ Compensation Claims in Washington

If you’ve lived in Washington for a while, you know the weather can be unpredictable. One minute it’s clear, and the next, a sudden storm rolls in. Workers’ compensation claims often feel the same way especially when a pre-existing condition is involved. You might feel like your claim is on solid ground until a medical record from ten years ago surfaces, and suddenly, the Department of Labor & Industries (L&I) is looking at you through a different lens.

There’s a common myth that if you already had a bad back or a “bum knee” before a workplace accident, you’re out of luck. That’s simply not true under Washington law. However, having a pre-existing condition does change the “weather” of your claim. It adds layers of complexity that require a bit of navigating to ensure you aren’t denied the benefits you’ve earned.

The “Thin Skull” Rule: You Are Taken as You Are

Washington follows a legal principle often called the “Thin Skull Rule.” In plain English, this means your employer takes you as they find you. If you have a physical frailty or a previous injury that makes you more susceptible to being hurt, the law doesn’t punish you for it.

If a workplace incident makes a previous condition worse, it is generally covered. The goal of the system is to return you to the state you were in immediately before the industrial injury—not to fix every health problem you’ve ever had, but to address the specific “aggravation” caused by your job.

Lighting Up vs. Worsening: What’s the Difference?

When we talk about pre-existing conditions in a legal sense, we usually put them into two buckets: “asymptomatic” and “symptomatic.” Understanding which bucket you fall into is the first thing a workers’ compensation attorney will look at when reviewing your file.

1. “Lighting Up” an Asymptomatic Condition

This happens when you have an underlying issue that wasn’t bothering you. Maybe you have degenerative disc disease in your spine which, frankly, most of us over the age of 30 have to some degree but you had no pain and no trouble doing your job.

If a sudden lift at work “lights up” that quiet condition and now you can’t walk without pain, L&I is typically responsible for the entire resulting disability. Since the condition wasn’t disabling before, the law treats the workplace injury as the primary cause of your current state.

2. Aggravating a Symptomatic Condition

This is a bit stickier. If you were already seeing a chiropractor once a month for lower back pain, your condition was “symptomatic.” If you then fall at work and that back pain goes from a “3” to a “9,” you still have a claim, but L&I only owes you for the increase in disability.

In these cases, the struggle is often about “apportionment.” The doctors will try to figure out how much of your current pain comes from the old injury versus the new one. It can feel like they’re splitting hairs, and frankly, sometimes they are.

A Real-World Scenario: The Case of “Old Reliable”

Consider Dave. Dave worked in a warehouse in Kent for fifteen years. Back in his twenties, he played semi-pro football and tweaked his shoulder. It flared up every now and then, but he never missed a day of work because of it. He was “Old Reliable.”

One Tuesday, a heavy crate slipped, and Dave reached out to catch it. He felt a familiar pop, but this time, he couldn’t lift his arm at all. When he filed his claim, the insurance adjuster found his old college medical records and tried to argue that his “rotator cuff was already shredded.”

Dave’s situation is classic. Because he was working full-duty without restrictions before the crate slipped, his attorney was able to argue that the workplace incident “lit up” a stable condition. Without that incident, Dave would still be “Old Reliable.” Instead of being dismissed, Dave got the surgery he needed covered by the state fund.

Why L&I Might Try to Deny Your Claim

The system isn’t always eager to pay out, especially when they can point to a “pre-existing” cause. Here are the hurdles you’ll likely face:

• The “Natural Progression” Argument: The most common tactic is for an L&I doctor to claim your condition was going to get worse anyway. They’ll say your pain is just the “natural progression” of age or a prior injury, and the workplace event was just a coincidence.
• The Independent Medical Exam (IME): You’ll likely be sent to an IME. I use the term “independent” loosely here. Often, these doctors are paid to find reasons why your injury isn’t work-related. They might spend ten minutes with you and then write a twenty-page report claiming your current issues are 100% pre-existing.
• Segregation of Conditions: L&I might “allow” your claim for a simple strain but “segregate” (deny) the more serious underlying issue, like a herniated disc, claiming it’s not related to the accident.

How to Protect Your Claim

If you know you have a “history,” don’t panic, but do be smart. Honesty is your best policy, but so is preparation.

Be Precise with Your Doctor

When you see your attending physician, don’t just say, “My back hurts.” Say, “My back was fine for five years, but since I fell on Friday, I have a sharp pain shooting down my left leg that I’ve never felt before.” The more you can differentiate the “before” and “after,” the harder it is for L&I to blame the past.

Gather Your Own Evidence

If you have been working 40 hours a week for years without taking sick leave for your pre-existing issue, that is powerful evidence. It proves that the condition wasn’t disabling. Keep copies of your performance reviews or attendance records.

Don’t Wait to Talk to a Professional

The paperwork in Washington workers’ comp is a mountain. One wrong box checked on a form can give the department the opening they need to deny you. Consulting a workers’ compensation lawyer early on can help you frame your medical history correctly so it doesn’t used against you.

The Bottom Line

A pre-existing condition shouldn’t be a “get out of jail free” card for your employer’s insurance. You pay into this system with every paycheck, and you deserve the protection it provides. Whether your back was “perfect” or just “good enough” before you got hurt, the fact remains: you were working, you got injured, and now you need help.

Navigating the intersection of old injuries and new claims is tough, but it’s a path many have walked before. You don’t have to prove you were a world-class athlete before the accident; you just have to prove that the job made things worse.