The Perry Johnson & Associates (PJ&A) breach that affected 1.2 million patients of Cook County Health in Illinois also affected millions of Northwell Health patients on Long Island,
PJ&A is a medical transcription service so lots of #PII and #PHI appear to be involved in this one.
The actual breach/exfil occurred months ago. So far, I've not found any attribution, any indication of any extortion/ransom demand, or any group claiming responsibility for this one.