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Modifier QS

Anesthesia provider

Modifier QS. Monitored anesthesia care (MAC) — informational; report actual time and a pricing modifier too.

Reference only — CPT descriptors are AMA-copyrighted (paraphrased). Payment percentages and acceptance vary by payer; verify against the current CPT/HCPCS files and payer policy.

Related modifiers

AA
Anesthesia personally performed by the anesthesiologist. 100%.
AD
Medical supervision, more than 4 concurrent procedures — reduced/fixed-unit paym…
QK
Medical direction of 2–4 concurrent procedures. 50%.
QY
Medical direction of one CRNA/AA by an anesthesiologist. 50%.
QX
CRNA/AA service with medical direction. 50%.
QZ
CRNA service without medical direction. 100% (CRNA-specific).
G8
MAC for a deep/complex/markedly invasive procedure — informational.
G9
MAC for a patient with a severe cardiopulmonary history — informational.

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