This has nothing to do with treatment at all. Quite the opposite in fact, it is merely a diagnosis, for the sole purpose of increasing the risk score. If the person had been treated for the condition there would be no need for the diagnosis.

United Health Care and others have figured out that if you go to someone's home, dubiously diagnose them with a condition that Medicare has deemed expensive to cover, Medicare will send them more money to provide health insurance for that person, whether or not they actually have the condition or ever receive treatment for it.

ETA to make it explicit with an exaggerated example: UHC gets say 10K/year from the govt to give you health insurance. Then UHC sends a nurse to your house who shines a flashlight in your ear and says "you have diabetes". Now UHC gets 15k/year from the govt to give you health insurance.