I have a new claim for migraines and unemployability and the va without asking added increases to my current disabilities, L Knee, R Knee, Tinnitus, Major depressive Disorder. They ordered all c&p exams and all were completed. Claim went back and forth several times prep for decision and gathering evidence. It was prep for decision and when it hit the first part of the estimated completion date 7-5-18, it went back to gathering evidence and gave a new estimated completion of january next year. Checked Vets.gov and in the files section showing all of the requested info from the VA it shows Request #7 CO Opinion Request is no longer needed. I cannot find anywhere what a CO Opinion Request is. Can somebody please help?