Health care providers across the country are asking a federal judge in Tennessee to set a date to require a leading health insurance claims processing network, Change Health, to restore access to their software programs after defendants failed to meet the date they initially promised following a crippling cyberattack last month.

In one of the first class action suits filed on behalf of a health care provider, Sara Lemke, a licensed therapist who owns Revival Therapy in Crystal Lake, Illinois, sued Change Healthcare, UnitedHealth Group, and Optum, seeking to hold them accountable after last month’s cyberattack that left providers across the country disconnected from technology services.