QSHCPCS Level II
Monitored anesthesia care service
- Usage notes
- Append to report that a service was a monitored anesthesia care (MAC) service.
- Common mistakes
- Omitting QS on a MAC case, causing the payer to process it as general anesthesia and apply the wrong payment methodology.
Related modifiers
Q0Investigational clinical service provided in a clinical research study that isQ1Routine clinical service provided in a clinical research study that is in anQ2Demonstration procedure/serviceQ3Live kidney donor surgery and related servicesQ4Service for ordering/referring physician qualifies as a service exemptionQ5Service furnished under a reciprocal billing arrangement by a substituteQ6Service furnished under a fee-for-time compensation arrangement by a substituteQ7One class a finding
Frequently asked questions
What does modifier QS mean?
Monitored anesthesia care service
When do I use modifier QS?
Append to report that a service was a monitored anesthesia care (MAC) service.
What's a common mistake with modifier QS?
Omitting QS on a MAC case, causing the payer to process it as general anesthesia and apply the wrong payment methodology.
HCPCS modifier data from CMS. CPT® is a registered trademark of the American Medical Association — CPT modifier descriptions are not included on this site. Always verify codes with authoritative sources before making billing decisions.