[technofiend]

Unfortunately as one example Medicare Part D price negotiation has been blocked since 2003. When some drugs were moved to Part B, insurance companies were furious because it allowed price negotiation for those.

This is from 2016, so nothing has changed AFAIK. https://www.healthaffairs.org/do/10.1377/forefront.20160919....

Despite this election season’s divisiveness, both major parties’ presidential candidates have embraced the idea of authorizing Medicare Part D to negotiate directly with drug companies to set prescription drug prices. The Medicare Modernization Act of 2003 (MMA), which established Medicare Part D, included a ban on such negotiation.

Apparently both sides of the aisle pander to voters with the idea they'll help with healthcare costs and then don't once safely elected to office.

[refurb]

Your summary doesn’t make much sense.

Part D plans are administered by private insurance, who do negotiate prices.

Part B drugs aren’t negotiated even today. Government has a formula for what they will pay, but there is no negotiation.