The big difference is if you are signing up for an employer provided group plan or trying to buy individual health insurance. For group plans provided by an employer there are federal laws (mainly HIPPA) that limit the time insurers can deny coverage for preexisting conditions (generally 6-18 months) regardless of what the preexisting condition is and how far back it goes. When it comes to individual policies it's usually up to the insurers (and state laws if applicable) as to how far they can look back and how long they can deny coverage for preexisting conditions.
I know that when I had a 12 month lapse of coverage and then got coverage through an employer they had a 12 month preexisting condition clause for my heart condition. That meant that I didn't have my annual cardio followup in 2007.
I know that when I had a 12 month lapse of coverage and then got coverage through an employer they had a 12 month preexisting condition clause for my heart condition. That meant that I didn't have my annual cardio followup in 2007.