self-certification
From Longman Dictionary of Contemporary Englishself-certificationˌself-certifiˈcation noun [uncountable] British English when you sign a form or note to say that you have been ill, to explain why you have not been at work or school for a short timeExamples from the Corpusself-certification• Medical certificates should be forwarded directly to the course director or senior course tutor. Self-certification will not be accepted.