1. If the person develops a mental disease during the period of serving the sentence, which deprived him from the ability to realize the nature and significance of his actions (inaction) or from governing his actions, then the court exempts him from serving punishment. The court can assign an enforced medical treatment of such a person, and when the person has recovered, he can be subjected to the punishment.
2. If the person develops another severe disease after committing the crime or after the issuance of the sentence, which prevents him from serving the sentence, the court can exempt him from serving the sentence, taking into account the gravity of the committed crime, the personality of the convict, the nature of the disease and other circumstances.
3. Persons defined by part one or part two of this article can be subject to criminal liability or punishment in case of recovery, if expiry dates set forth in articles 75 and 81 of this Code have not passed.
4. A serviceman is exempted from serving the punishment in the disciplinary battalion in the case of an illness as a result of which he is considered not eligible for military service.

Source: Iravaban.net