A nationwide ransomware attack in early May had forced a return to manual or paper records, causing hiccups for some services.
"As (electronic health records) are restored across the entirety of our networks, clinicians will be able to access patient records as they did prior to this incident," Ascension said in a statement on Tuesday.
"While these are promising developments in our recovery efforts, our investigation into this incident remains ongoing, along with the remediation of additional systems. This is a complex process, and it will still take time to complete," the statement said.
In southeast Michigan, Ascension operates hospitals in Novi, Rochester Hills, Southfield, Madison Heights, Warren, Detroit, East China Township and Grand Blanc.
All 15 Michigan hospitals, as well as physician offices and care sites across the state, remained open after the attack. But patients were asked to bring notes on symptoms and a list of current medications because, in many cases, electronic systems were down.
Ascension also advised patients that they could experience longer than normal wait times.
In another new development as the health care company recovers from the attack, Ascension's Michigan's retail, home delivery and specialty pharmacies have resumed normal operations.
Ascension Michigan announced last month that its pharmacies would not be able to fill prescriptions.
Due to high volumes, there may be a delay in processing and shipping.
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