Free Insurance Claim Tools

Get AI-powered analysis of your denied claim in 3 minutes. Identifies appeal grounds, cites regulations, and shows your success likelihood.

Enter your denial letter date and select your country to see exactly when your appeal deadlines expire.

Every strong appeal letter must include these 10 elements. Print this checklist and use it to review your letter before submitting.

Enter a denial reason code or keyword to get a plain-English explanation and the typical appeal strategy.

What it means: The procedure code submitted doesn't match the modifier used, or the procedure isn't covered under your plan.

How to appeal: Review the billing codes with your provider. Ask for a corrected claim with the right CPT code and modifier. If the procedure should be covered, cite your plan's Summary of Benefits and Coverage (SBC).

What it means: The diagnosis code (ICD-10) doesn't support the procedure code (CPT) that was billed. The insurer says the treatment doesn't match the condition.

How to appeal: Ask your doctor to review the diagnosis and procedure codes. Often this is a coding error. Request a corrected claim with the correct ICD-10 code that supports the procedure.

What it means: The treatment required prior authorization (pre-approval) from the insurer, but it was not obtained before the service was provided.

How to appeal: Check if retroactive authorization is possible. If prior auth was obtained, submit proof. If the provider failed to get it, the provider — not you — may be responsible for the cost. Invoke the No Surprises Act if applicable.

What it means: The claim was denied because required information is missing — such as medical records, a referral, or additional documentation.

How to appeal: Contact the insurer to find out exactly what's missing. Resubmit the claim with the required documentation. This is often the easiest denial to overturn.

What it means: The insurer believes this claim has already been submitted and paid, or the same service was billed twice.

How to appeal: Verify whether the claim was truly a duplicate. If services were on different dates or for different conditions, provide documentation showing they are distinct claims. Ask your provider to resubmit with clarifying notes.

What it means: Another insurance plan may be primary. The insurer thinks a different plan should pay first.

How to appeal: Update your coordination of benefits information with both insurers. Confirm which plan is primary and which is secondary. Resubmit the claim to the correct primary insurer first.

What it means: The claim was submitted after the insurer's filing deadline (typically 90 days to 1 year from date of service).

How to appeal: Check if the late filing was due to circumstances beyond your control (e.g., you didn't receive bills, the provider delayed). Request a good-cause exception. File a complaint with your state insurance department if the insurer is unreasonable.

What it means: The amount charged exceeds what the insurer considers the "allowed amount" or "usual and customary" rate for the service.

How to appeal: Request the insurer's fee schedule or explanation of how the allowed amount was calculated. If you received out-of-network care, invoke balance billing protections (No Surprises Act for emergency/certain services). Negotiate directly with the provider.

What it means: The insurer determined the treatment is not medically necessary based on their clinical guidelines — even if your doctor recommended it.

How to appeal: This is the most commonly overturned denial. Get a detailed Letter of Medical Necessity from your doctor. Cite peer-reviewed studies, clinical guidelines, and your insurer's own medical policy. Reference ERISA or state mandates requiring coverage.

What it means: The service or procedure is not a covered benefit under your insurance plan.

How to appeal: Read your plan's SBC and policy document carefully. Sometimes insurers incorrectly classify services. If the service should be covered (e.g., under mental health parity, ACA essential health benefits), cite the specific regulation.

What it means: The insurer bundled this procedure with another, paying only for one. They consider both procedures part of a single service.

How to appeal: Ask your provider to review the billing. If the procedures are truly distinct, request modifier -59 (distinct procedural service) be added. Provide operative notes showing the procedures were separate.

What it means: The provider who treated you is not in your insurer's network, so the claim is denied or reimbursed at a lower rate.

How to appeal: Check if the No Surprises Act applies (emergency services, certain hospital-based providers). Invoke continuity of care protections if your provider left the network mid-treatment. Request a network gap exception if no in-network provider was reasonably available.

What it means: The amount shown is your responsibility because it applies to your annual deductible — the amount you pay before insurance kicks in.

How to appeal: Verify that your deductible has been calculated correctly. Check if other claims should have been applied first. If you believe the deductible has been met, provide an itemized list of all claims for the year.

What it means: This is your share of the cost (coinsurance percentage) after the deductible has been met. It's not a denial — it's your cost-sharing portion.

How to appeal: Verify the coinsurance percentage matches your plan. Check if the service should have been covered at a higher rate (e.g., preventive care at 100%). Ensure the correct network tier was applied.

What it means: This is a fixed copay amount you owe for the visit or service. It's a standard cost-sharing provision of your plan.

How to appeal: Confirm the copay amount matches your plan documents. If the service should have been covered with no copay (e.g., ACA-mandated preventive services), cite the specific ACA provision.