Lipitor is a medication used to treat high cholesterol levels in the body. It belongs to a class of drugs called statins and is commonly prescribed to individuals with certain pre-existing conditions. Based on the provided sources, we can gather information about the pre-existing conditions that may qualify for Lipitor coverage.

According to the first source, Drug Patent Watch, Lipitor is primarily prescribed to individuals with high cholesterol levels, specifically those with hyperlipidemia or mixed dyslipidemia. These conditions involve elevated levels of cholesterol and triglycerides in the blood, which can increase the risk of cardiovascular diseases such as heart attacks and strokes.

The second source, MarketWatch, provides information about travel insurance for pre-existing conditions. While this source does not directly mention Lipitor, it is important to note that travel insurance is generally not designed to cover the cost of prescription medications like Lipitor. Instead, travel insurance typically focuses on providing coverage for unexpected medical emergencies that may occur while traveling.

The third source, the Washington State Office of the Insurance Commissioner, discusses Medigap plans, which are supplemental insurance plans that can be used in conjunction with Medicare. Medigap plans are intended to help cover the costs that Medicare does not fully pay for, such as deductibles, copayments, and coinsurance. However, this source does not specifically mention Lipitor or pre-existing conditions that qualify for Medigap coverage.

In summary, based on the provided sources, Lipitor is primarily prescribed for individuals with high cholesterol levels, specifically those with hyperlipidemia or mixed dyslipidemia. It is important to note that travel insurance is generally not designed to cover the cost of prescription medications like Lipitor. Medigap plans, on the other hand, can help cover the costs that Medicare does not fully pay for, but the specific pre-existing conditions that qualify for Medigap coverage are not mentioned in the provided source.

Sources:
[1] Drug Patent Watch: https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] MarketWatch: https://www.marketwatch.com/guides/insurance-services/travel-insurance-for-preexisting-conditions/
[3] Washington State Office of the Insurance Commissioner: https://www.insurance.wa.gov/sites/default/files/documents/what-you-need-to-know-medigap-plans_4.pdf