Many denied claims fall into technical categories that can be appealed under the terms of your policy
Many of these cases involve documentation, deadlines or technical categorization issues that can be addressed within your insurer’s formal procedure.
When an insurer denies your medical claim, the first reaction is usually to accept the decision. After all, they wrote the letter in flawless technical language, citing the article of your policy. But in most of the cases we analyze at Seguros360, the denial rests on one of these 8 reasons, and many can be addressed within your insurer’s formal procedure if you act within the deadline with the required documentation.
This guide comes straight from the Seguros360 Claims Observatory, where we automatically classify hundreds of real conversations with clients who come to us for help after a denial. The percentages cited correspond to the Observatory’s pilot sample (43 cases analyzed between July 29 and August 11, 2026); in September we published the first report with a larger volume.
Reason 1: Undeclared pre-existing condition
What the letter says: “The condition existed before the policy took effect and was not declared in the application.”
What is really going on: The insurer found something in your medical history (a consultation, a test, a prescription) suggesting the condition was already present before you signed up. It does not always mean you hid something intentionally: very often the insured did not even know that “minor” symptom counted as a condition.
Reason 2: Missing pre-authorization
What the letter says: “The procedure does not have prior authorization as established in the policy.”
What is really going on: Certain treatments, elective surgeries and hospitalizations require notifying the insurer before they take place. The insured or the doctor did not complete that step, and even if the procedure was covered, the administrative omission invalidates it.
Reason 3: Incomplete documentation
What the letter says: “The documentation submitted is insufficient to process the claim.”
What is really going on: Original invoices, a medical report or the claim form are missing, or there are inconsistencies between what the doctor says and what the invoice says. This is the category where complete documentation filed within the deadline gives the insurer the technical elements to re-evaluate the case.
Reason 4: Out of network or unauthorized provider
What the letter says: “The medical provider is not part of the policy’s authorized network.”
What is really going on: You were treated at a hospital, clinic or practice that the insurer does not recognize as a network provider for your plan. Local plans tend to have very closed networks; international plans have worldwide networks, but also with exclusions.
Reason 5: Specific policy exclusion
What the letter says: “The requested treatment is excluded from coverage under article X of the policy.”
What is really going on: Your policy has a written exclusion: cosmetic surgery, experimental treatments, alternative medicine, fertility, certain high-risk sports, etc. The insurer applies the exclusion to the letter.
Reason 6: Waiting period in effect
What the letter says: “The requested benefit is not yet in effect because the waiting period has not been completed.”
What is really going on: Many policies have waiting periods: 9 to 12 months for maternity, 6 months for certain treatments, 24 months for declared and accepted pre-existing conditions. If the event occurs within that period, the insurer does not cover it.
Reason 7: Annual limit or sub-limit exhausted
What the letter says: “The maximum annual coverage limit for this benefit has been reached.”
What is really going on: Your plan has an overall annual cap or caps per benefit (for example, outpatient, medication, rehabilitation). You already used up that cap with earlier events in the same policy year.
Reason 8: Late payment or policy not in force
What the letter says: “The policy was not in force at the time of the medical event.”
What is really going on: The premium was not up to date. It may be an oversight, a declined card, or the insurer applied a reinstatement date different from the one you assumed.
What to do in the next 24 hours if your claim was denied
- Keep the denial letter in writing. Ask for it if you were only told verbally. It must cite the specific article of the policy that supports the decision.
- Write down the exact date of the denial. Your policy’s appeal deadlines run from that day.
- Gather all the documents of the case: policy, invoice, medical reports, prescriptions, prior test results. All in chronological order.
- Request an independent analysis before accepting the denial. It can save you thousands of dollars.
Free analysis of your case in 3 minutes
Our virtual specialist Izi listens to you, classifies the real reason for the denial, explains your options and, where applicable, we prepare a written analysis sent to your email. No cost, no sign-up, no commitment.
Frequently asked questions
Is the analysis really free?
Yes, no cost and no commitment. It is a service we offer to position Seguros360 as the LATAM wholesaler that best understands IPMI. Many of those who consult us are not and will not be clients; we value the conversation anyway.
Do I need to send documentation first?
No. In the first conversation with Izi we ask only the essentials: insurer, treatment, stated reason for the denial. That is enough to classify the case. If you want a written analysis, you share the documents with us by email afterwards.
Do you work with any insurer?
Yes. We analyze claims denied by local insurers (OSDE, Sanitas, GNP, Colsanitas, SUSEP, ARS, etc.) and by international IPMI insurers (Best Doctors, VUMI, BUPA, EVER, American Fidelity, BMI). The reason for the denial follows the same principles at any company.
What happens after the analysis?
You receive by email a written analysis with the denial category, concrete options and, where appropriate, a reconsideration letter template. If you eventually want to get a quote for an international plan so you no longer depend on local insurers, that is an optional second step, never automatic.
Is my case confidential?
Absolutely. The conversation is processed anonymously and in aggregate for our Observatory; we never share individual cases. You can request full deletion by writing to jb@seguros360.com.
How long does the written analysis take?
Less than 24 business hours from the moment we receive the complete documents. In urgent cases (short appeal deadlines), we prioritize.
Can I request the analysis via WhatsApp?
Yes. Write to us at +1 (305) 610-5355 and we will set up the conversation with Izi or with a human specialist.
Does the analysis guarantee a result?
No. Nobody can promise a result — the final decision belongs to the insurer under the terms of your policy. What we can offer is that after the analysis you will know the technical category of your denial, what options you have under the applicable regulatory framework, what documents to prepare and what deadlines apply. With that clarity, you make better decisions.
Do not miss the deadline. Act now.
The administrative deadlines to appeal (typically 30 to 60 days from the letter) are short. A 3-minute analysis today clarifies the options available and the regulatory framework that applies in your country.
The percentages cited in this article come from the Seguros360 Claims Observatory, aggregated from real conversations with clients during 2026. The data are anonymous and aggregated; we never identify individual cases. This article does not constitute legal or medical advice.
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