Recognition
Regulated · non-EU qualifications are assessed case by case
Who decides: Ministry of Health (Ministero della Salute), which recognises the qualification; then the provincial OPI (Ordine delle Professioni Infermieristiche), which registers you — Two separate acts. The ministry's decree says your qualification is valid in Italy; registration with the provincial OPI is what lets you practise, and FNOPI states that enrolment in the register is compulsory for nursing practice. The ministry's form for EU citizens warns, in general terms, that practising a health profession in Italy before it recognises the qualification is a criminal offence.
Italy runs recognition profession by profession. The official list of regulated professions names, for each one, the authority that decides, which under D.Lgs. 206/2007 is the ministry that supervises that profession. A profession is regulated in Italy when practising it requires registration in an order, college or public register, when access to employment in it requires a qualification by law, or when it is practised under a reserved title. Where the profession is not regulated, no recognition is needed to work: the employer reads the qualification.