1985, from co- "along with" + morbidity "diseased condition." Comorbid (adj.) is a 1990 back-formation.
Entries linking to comorbidity
co-
in Latin, the form of com- "together, with" in compounds with stems beginning in vowels, h-, and gn-; see com-. Taken in English from 17c. as a living prefix meaning "together, mutually, in common," and used promiscuously with native words (co-worker) and Latin-derived words not beginning with vowels (codependent), including some already having it (co-conspirator).
morbidity n.
"morbid condition or state," 1721, from morbid + -ity or from French morbidité.