Companies like Walmart, CVS, and Amazon are beefing up their healthcare strategies. Here are their plans to upend the $3.5 trillion industry.

• Some of the biggest retailers in America are looking to get a bigger piece of the $3.5 trillion healthcare market.
• As healthcare costs keep rising for Americans, retailers see an opportunity to win patients over with convenience and lower prices.
• Here's how retailers like CVS Health, Walgreens, Walmart, and Kroger are bulking up their healthcare strategies.
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The $3.5 trillion healthcare industry is in flux.

As healthcare costs keep rising - leaving Americans on the hook for higher bills - retailers see an opportunity to win patients over with more convenient places to get care and/or lower prices.

It's led to the lines around what constitutes a healthcare company being redrawn, with retail pharmacies like CVS Health acquiring insurers, and tech companies like Amazon getting into the pharmacy business, and major grocer Kroger investing more in keeping its shoppers healthy with the help of food.

It's also happening at a time when those same retailers are competing to get customers to still come through their doors as more and more shopping moves online. One way to do that is to have customers come to the centers for check-ups, lab testing, or other health services.

Here's how retailers like CVS Health, Walgreens, Walmart, and Kroger are bulking up their healthcare strategies.