Taking into account the article 9 of the RDL 20/2012, if a Town Council establishes complements to the provision for IT, it would be authorized to treat particulars related to the health determinate of the worker who is in situation of IT, in particular, the fact that an operation has to be produced or an included hospitalization in the briefcase of services common. Beyond this, it is not inferred from the regulations that the Town Council has to know the concrete causes of the hospitalization, the type of operation, or the description of the functional limitation and the relation with the process of hospitalization or of operation, and therefore these data of health are "excessive" from the prospect of the principle of quality.