On Feb. 21, 2024, Change Healthcare, a subsidiary of the UnitedHealth Group Optum unit, experienced a cyberattack that resulted in nationwide outages affecting payors, physician practices and other providers and pharmacies. The outage has caused interruption of numerous administrative and billing processes, including electronic claims submission, provider payments, pharmacies, prior authorizations, payor chart retrieval, etc. The California Medical Association (CMA) is closely following the issue, and you can find the most recent updates below.