Pre existing diseases are not covered in a health insurance policy. Preexisting means a disease that you have had prior to joining a health insurance policy. The policyholder may or may not have been aware of the pre-existing disease. Further complications which arise due to the preexisting disease are also not covered. For example, renal problems which arise due to a person having diabetes at the start of the policy would not be covered.
This can sometimes lead to a lot of confusion and heartburn. Someone gets admitted for a kidney related treatment, and the insurance company turns down the claim saying the kidney problem has arisen because the patient had diabetes, and rejects the claim. It can get a little grey here as medical science cannot sometimes clearly pinpoint the root cause of a particular disease outbreak. In most cases, preexisting diseases are covered after 3 or 4 consecutive policy years. This is the single biggest reason why one should buy a health insurance policy at a young age, and continue with the same insurer. Because if you shift to a new insurer, you lose your previous credit and a disease that was being covered by the old insurer might be treated as a pre-existing disease by the new insurer.
We have noticed that insurance companies start facing more claims from the health insurance customers from their 4th or 5th policy year, as pre existing begins to get covered and the profitability of the portfolio goes down.
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