Mistreatment
One suitable prefix for the word "treatment" is "mis-", which would change it to "mistreatment" to denote poor or unfair handling.
Cardio-, meaning heart, is the prefix of cardiology.
It means, literally, "in", as opposed to "out". It's not so much a prefix as a portmanteau word, combining the words in + patient.
The prefix be- indicates thoroughness or completion of treatment, as in bespeak or besiege, or an action that causes a condition to exist e.g. belittle, befriend, besmirch.
Mistreatment
Booking a hotel room with the prefix of "doctor" may sometimes lead to receiving special treatment or upgrades due to the assumption of higher status or importance.
The prefix anti- means against, so antitumor treatment is anything designed to fight the tumor, such as chemotherapy and radiation.
The prefix of "neurology" is "neuro-," which comes from the Greek word "neuron," meaning "nerve." This prefix is commonly used in medical terminology to refer to anything related to the nervous system, including the brain, spinal cord, and nerves. In the context of neurology, it signifies the study and treatment of disorders affecting these areas.
Prefix=IN
The prefix for inadequate is in-. The prefix in- means not.
The prefix for include is in-. This prefix means not.
Yes, prefix does have a prefix. The prefix is pur-.