It’s a mad, mad, mad, mad Medicare world, and unfortunately, just about every regulation requires a modifier. If you apply the wrong modifier—or forget one entirely—then your clinic suffers decreased payments or flat-out denials. Even worse, if you amass enough modifier mistakes, you make your practice vulnerable to an audit.

Worried you’re miserable at modifiers or want confirmation that you’re actually a modifier master? Take our 10-question quiz below to test your modifier know-how.