The data (dates of medical visits, consultations, citations or medical tests carried out and periods of hospitalization) are data of health of the patient affected (art. 4.15 RGPD) and his communication, although not specified the illness or reason of the visit or is subject to the regime of article 9 of RGPD. The Hospital, as the person responsible for the data of the HC of the patient (art. 4.7 GDPR), may request additional information from the tax authorities to the first requirement on the tax obligation which would justify the processing of data to the taxation administration. Similarly, if the data required is not special category data. Given the information available, this authority cannot determine what personal information the patient could have of tax transcendence and, therefore, what data should be communicated to the tax administration.