Diminished value claim denied or underpaid
First identify what the insurer actually rejected: coverage, the other driver’s liability, proof that any market loss exists, or the dollar amount. Each problem needs different evidence, and a better appraisal cannot fix every coverage denial.
Get the position in writing
Ask for the denial or offer, calculation, factual inputs, comparable vehicles, and cited policy or legal language. After a phone call, send a short email confirming what was discussed.
Correct factual errors
Check model, trim, options, mileage, prior history, repair total, damage description, and responsibility for the accident. A valuation using the wrong vehicle is easier to challenge than a disagreement about methodology.
Answer the real issue
If coverage is excluded, ask whether the claim should instead proceed against the at-fault driver or under UIM/UMPD. If the insurer says no market loss exists, provide matched comparables. If only the amount is disputed, compare both methods line by line.
Consider escalation proportionally
Possible paths include a supervisor review, policy appraisal clause, state insurance complaint, demand against the at-fault person, small claims court, or legal advice. A regulator may require a response but usually cannot decide contested fault or award your damages.
Do not sign blindly
Read any release before accepting payment. A broad property-damage release may resolve more than the specific amount being discussed. Confirm the filing deadline before allowing negotiation to continue.