In February, a ransomware attack on Change Healthcare brought US medical billing to a standstill, propelling hundreds of financially strapped health systems and medical practices to the brink of bankruptcy. The breach froze the cash flow of organizations that collectively account for a fifth of the U.S. economy, potentially compromised ~85 million patient records and cost billions of dollars. It may be months or years before the final toll is known. Read on for lessons learned plus five key actions to make cybersecurity more resilient and protect against another such paralyzing breach. By Janet Guptill, SI; John Glaser, PhD, Harvard Medical School; and Erik Decker, Intermountain Health.

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