I chose these 2 uses for ICD coding: research the quality of health care and plan for future healthcare needs. What importance does the correct ICD

I chose these 2 uses for ICD coding: research the quality of health care and plan for future healthcare needs. What importance does the correct ICD code choice have for these particular uses? What can happen if the correct ICD code is not assigned?

I can answer the second question, its just I cant seem to find the first one.