HCPCS Modifier QS

Published 07/16/2020

Monitored anesthesia care (MAC) service.

Guidelines and Instructions
  • This modifier can be used by a physician or a qualified nonphysician anesthetist
  • This modifier may only be submitted with anesthesia procedure codes (i.e., CPT codes 00100 through 01999)
  • Submit HCPCS modifier QS to indicate that the anesthesia service performed as monitored anesthesia care
  • This modifier is informational only. You must report actual anesthesia time and one of the HCPCS payment modifiers on the claim.
  • Submit the HCPCS payment modifier indicating that the service was personally performed or involved medical direction or medical supervision first, and submit HCPCS modifier QS second
  • Monitored anesthesia care involves the intra-operative monitoring by a physician or qualified individual under the medical direction of a physician or of the patient's vital physiological signs in anticipation of the need for administration of general anesthesia or the development of adverse physiological patient reaction to the surgical procedure. It also includes the performance of a pre-anesthetic examination and evaluation, prescription of the anesthesia care required, administration of any necessary oral or parenteral medications (e.g., Atropine, Demerol, Valium) and provision of indicated postoperative care.

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