Marc Levy A patient arrives July 14 at CHA Cambridge Hospital.

Cambridge Health Alliance is “deeply concerned” about proposed changes to a prescription drug discount program that few patients know about yet has helped nonprofit “safety net” health care systems such as the Alliance survive financially and delivered lower prices to low-income and uninsured patients. Spokesperson David Cecere said last week that CHA is “actively working with advocacy partners to persuade the federal government” not to make the changes.

The program, known as 340B after a section of the federal law that established it in 1992, has required some drugmakers to sell prescription medicines at a deep discount to thousands of hospitals and other health centers that serve many low-income patients. The medical cente

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