If your personal doctor has undergone the required training and is designated by the Department of State or by a USCIS District Director, he can do your immigration medical. Otherwise, the required medical examination must be performed according to guidelines published by the Centers for Disease Control and Prevention (CDC). That is, for immigrant visa applicants, the medical examination is performed by a panel physician designated by the Department of State. For adjustment of status applicants, the medical examination is performed by a civil surgeon designated by a USCIS District Director.