Medicare modifier reference
Plain-language Medicare billing modifier references — what each modifier means, which claim line it belongs on, how it affects payment, and the primary CMS rules behind it.
Modifier 25
Modifier 25 tells Medicare that an evaluation and management (E/M) service performed on the same day as another procedure or service was significant and separat...
Modifier QW
Modifier QW tells Medicare a laboratory test was performed with a test system waived under CLIA. It lets the claim pass the CLIA certificate edit for a site hol...
For the payment concepts behind these rules, browse the glossary and guides.