Mallinckrodt announced yesterday that it is suing the Centers for Medicare & Medicaid Services and the Department of Health and Human Services for changing the way Medicaid rebates are calculated for its pricey H.P. Acthar Gel medication.

Details: The move would require Mallinckrodt to pay back large sums of money to the federal government.

Why it matters: The drug company expects the change will eliminate 10% of its Acthar sales, and that it will have to pay up to $600 million in retroactive rebates — news that sent the company's stock plunging by 24% Tuesday to a record-low $9.87 per share.

Reality check: Acthar has been under the gun for several years now. Independent experts say the drug, which is a half-century old and treats multiple sclerosis and infantile spasms, is excessively priced and isn't any better than cheaper alternatives.

The bottom line: Mallinckrodt is fighting tooth and nail to protect Acthar because it is the lifeblood of the company. The drug makes up 35% of Mallinckrodt's revenue.

Go deeper: The drug pricing maze

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Rural America has its own coronavirus problem

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Axios Re:Cap digs into the pandemic's urban-rural divide with microbiologist Amber Schmidtke, who has found that coronavirus-related morbidity is higher in many of Georgia's rural counties than in Atlanta.

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Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 3:30 p.m. ET: 12,373,722 — Total deaths: 556,863 — Total recoveries — 6,794,982Map.
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  3. Public health: The U.S.'s new default strategy: herd immunity — 23 states and D.C. are mandating face coverings.
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Biden and Trump point fingers over "buy American" proposals

Joe Biden at a campaign event in Wilmington, DE. Photo: Alex Wong/Getty Images

President Trump and Joe Biden are going back and forth over the former vice president's "buy American" economic proposal, which Trump claims Biden "plagiarized" from him.

Why it matters: Biden is directly challenging Trump and his "America First" agenda with the release of his latest plan, focused on economic recovery and re-investing in American manufacturing in the wake of the coronavirus pandemic.