I remember health insurance companies were capturing this data during H1N1 (voluntary reporting from providers), but of course the data was limited by insurance

I remember health insurance companies were capturing this data during H1N1 (voluntary reporting from providers), but of course the data was limited by insurance company and voluntary reporting. So there is some leniency over aggregated data (remember the cost and quality calculators from the mid-2000s?). I wonder what the CDC requires providers to report?