That occurs at the same time as another(adjective)
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Use "comorbid" in a sentence
"The rates were 6 percent for those with so-called "comorbid disorders" for example, mental illness and/or substance abuse issues who did not receive smoking cessation counseling from their family doctor, 10.5 percent for those without the comorbid disorders who did not receive counseling, about 31 percent for those with the comorbid disorders who did receive counseling, and nearly 35 percent for those without the disorders who received counseling."
"In West Virginia many patients have "comorbid" conditions that require a cocktail of drugs to treat, says Peggy King, pharmacy director for West Virginia's Bureau for Medical Services."
"I was somewhat surprised, since my understanding of co-existing (or "comorbid", in doctor-and-researcher-speak) conditions were things such as depression and diabetes, depression and eating disorders, and diabetes and eating disorders ..."