$ perl -00pe 's/(^[^\n"]*"[^"\n]*)\n((?1))/\1 \2/g' m
090033ec82b13639,CPDM Initiated,Logistical,"There corrected.",Gul Y Serbest,Urology
090033ec82ae0c07,Initiated,NA,"To local testing
Rohit 3 to 4.",Julienne B Orr,Oncology
090033ec82b35fd0,Externally Initiated,NA,regulatory agency requests,Kenneth A Lord,Oncology