Some pet insurance policies treat certain conditions that can affect both sides of the body, such as a knee ligament in each hind leg, as one condition. If your pet's earlier issue on one side came before coverage, a later claim for the other side may be denied under that kind of clause. This guide explains how to check whether that's what happened and how to organize a response.
What a "bilateral condition" clause is
Policies that include a bilateral clause usually say that if a condition affects one side before coverage, the same condition on the other side may also be excluded. Which conditions are listed, and how the clause is written, varies by insurer and by policy. Some policies may not have such a clause at all.
Cruciate ligament problems are often mentioned in these discussions, but we won't describe how the condition develops. Ask your veterinarian about anything medical.
Step 1: Find the exact wording
Look in your policy for terms like "bilateral," "both sides," "left and right," or a list of named conditions. Copy the exact clause. Then check the denial letter: does it cite that clause, a pre-existing condition clause, or both? Your appeal should respond to the reason actually given.
Step 2: Build the timeline for each side
Make two short timelines, one per side:
- First mention of any sign, limping, or exam finding, with the date and clinic.
- Diagnosis date.
- Treatment dates.
- Your policy start date and any waiting periods.
Look carefully at what the earlier records actually say. A note such as "lame on left hind" is different from a diagnosis, and a note about one leg is different from a note about both. Do not reinterpret the notes yourself; just record what they say and when.
Step 3: Check which side the records refer to
Errors happen. Left and right get mixed up in notes, and records from different clinics can conflict. If you believe the insurer read an entry as referring to the wrong side or the wrong problem, ask your vet to review the entry and, if they agree, provide a written correction or clarification.
Step 4: Ask your vet the right questions
Questions you might ask your veterinarian:
- Does the earlier entry refer to this side, the other side, or neither?
- Was there an exam finding before the policy date for the side now claimed?
- Would you be willing to put your view in a short letter?
Let the vet use their own words. Don't ask them to sign something you drafted about medical matters.
Step 5: Put the appeal together
Your appeal can include:
- Claim and policy details.
- A statement that you are requesting review of the bilateral or pre-existing decision.
- The two timelines.
- The specific reason you believe the clause doesn't apply as written (for example, the cited record refers to a different issue, or falls outside the period the policy describes).
- Attached records, invoices and any vet letter.
- A request for a written explanation of the result.
Keep it factual and short. Long emotional letters are harder for a reviewer to follow.
Step 6: Send and track
Follow the submission method your insurer specifies, note the date, and keep copies. Appeal time limits differ by insurer.
If you would like help pulling this together, you can start your appeal pack: upload your denial letter, policy and vet records, and we prepare the documents for you to review and send.
FAQ
What is a bilateral condition in pet insurance? It's a term some policies use for conditions that can affect both sides of the body. Whether and how it applies depends entirely on your policy wording.
My dog's first knee issue was before coverage. Is the second one automatically excluded? Not necessarily. It depends on your policy's wording and what the records show. Read the clause and check the dates.
Can a vet letter help? If the question is what an earlier record entry referred to, your vet is the best person to clarify it. Whether it changes the decision is up to the insurer.
Can you tell me if my claim should have been paid? No. We help organize documents; we don't assess coverage or give legal or medical opinions.
Pet Claim Appeal Aid is a document preparation service, not legal advice. We are not a law firm and are not affiliated with any insurer. Your policy documents and your insurer’s written instructions always take priority over this guide.