Consider signing-up with the Medic Alert Foundation (a not for profit)and obtaining their engraved neck medallion or bracelet. Even if you have no defined medical need for this ID, you can have your name, blood type, religion, emergency contact number, allergies,etc., engraved on the back of the rather inconspicious medallion/brecelet. You also have the Foundation's "800" number and your registration number. The police/hospital can call their registry and get your complete medical history (you submit it when you sign up), along with other emergency and contact info. A life membership allows you to update for free. EMTS and police know to look for them on your neck/wrist along with a wallet card containing more details (e.g. a list of your daily meds). Cheap insurance. Usual disclaimers.