In evaluating a policy, you should determine whether it limits or excludes coverage for existing health conditions. Many policies do not cover health problems that you have at the time of purchase. Pre-existing conditions are generally health problems you saw a doctor about within the 6 months before the date the policy went into effect. If you have had a health problem, the insurer might not cover you for expenses connected with that problem. Medigap policies, however, are required to cover pre-existing conditions after the policy has been in effect for 6 months.
Some companies have shorter waiting periods before covering a pre-existing condition.
Beware of Replacing Existing Coverage Be careful when buying a replacement Medigap policy. Make sure you have a good reason for switching from one policy to another you should only switch for different benefits, better service, or a more affordable price. On the other hand, don't keep inadequate policies simply because you have had them for a long time. If you decide to replace your Medigap policy, you must be given credit for the time spent under the old policy in determining whether and to what extent any pre-existing conditions restrictions apply under the new policy. You must also sign a statement that you intend to terminate the policy to be replaced.