Get the full pre-policy record
For pre-existing-condition disputes, the carrier looks at vet records before your policy effective date. The minimum useful window is 12 months pre-policy; for chronic conditions, your vet may have records going back further. Request the full chronological record from every vet your pet has seen — not just the most recent one.
If you switched vets between pet acquisition and your policy start, the prior vet's records often contain the line the carrier is invoking — or the line that clears your case.
Identify the date of first symptoms
Most carrier definitions hinge on when symptoms FIRST appeared, not when the diagnosis was made. The exam-day note is what the carrier reads — but the question is “did the symptoms exist before the policy effective date?”
A vague mention in a routine wellness exam (“mild gait stiffness noted”) may not constitute “clinical signs” under the carrier's definition. Your vet may need to write a clarifying note distinguishing routine-exam findings from clinical diagnosis.
Get a letter of medical necessity
For procedures the carrier flagged as preventive (treatment vs. prevention denials, dental denials), a written letter from the treating vet explaining why the procedure was medically necessary at this specific time often shifts the carrier's position.
The letter should reference: the diagnosis that made the procedure necessary, the medical urgency, the prognosis without treatment, and an explanation of why the procedure was not part of routine care.
Document the bilateral / contralateral question
For bilateral-condition denials (one side previously treated, other side now claimed), get a vet note specifically addressing whether the contralateral side has any clinical evidence of predisposition — or whether the original side's condition was traumatic (an injury) rather than predispositional.
Match diagnostic codes carefully
Sometimes the denial cites an exclusion that doesn't actually match the diagnostic code your vet used. Pull the diagnostic codes from the vet records and cross-reference them against the cited exclusion in the denial letter. A mismatch is grounds for requesting clarification — sometimes the denial is reversed at that step.
Privacy: how to get records to your appeal without uploading PHI
Vet records contain protected information. The Appeal Letter Generator on this site does NOT upload them — you attach them directly when you submit the appeal to the carrier. The generator only lists the filenames you have on hand so the attachments checklist is complete.
Open the letter generator →