QS Modifier
Monitored anesthesia care service
HCPCS modifierQS
- Description
- Monitored anesthesia care service
- Short description
- Monitored anesthesia care
- Added
- January 1, 1990
- Last change
- July 1, 1996
What does the QS modifier mean?
The HCPCS Level II modifier QS means: “Monitored anesthesia care service”. Append it to a HCPCS or CPT code on the claim line when the payer’s policy calls for it; placement and payment effects are defined by each payer.
Other Q modifiers
- Q0 – Investigational clinical service provided in a clinical research study that is in an approved clinical research study
- Q1 – Routine clinical service provided in a clinical research study that is in an approved clinical research study
- Q2 – Demonstration procedure/service
- Q3 – Live kidney donor surgery and related services
- Q4 – Service for ordering/referring physician qualifies as a service exemption
- Q5 – Service furnished under a reciprocal billing arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
- Q6 – Service furnished under a fee-for-time compensation arrangement by a substitute physician or by a substitute physical therapist furnishing outpatient physical therapy services in a health professional shortage area, a medically underserved area, or a rural area
- Q7 – One class a finding
- Q8 – Two class b findings
- Q9 – One class b and two class c findings
- QA – Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts is less than 1 liter per minute (lpm)
- QB – Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts exceeds 4 liters per minute (lpm) and portable oxygen is prescribed
- QC – Single channel monitoring
- QD – Recording and storage in solid state memory by a digital recorder
- QE – Prescribed amount of stationary oxygen while at rest is less than 1 liter per minute (lpm)
- QF – Prescribed amount of stationary oxygen while at rest exceeds 4 liters per minute (lpm) and portable oxygen is prescribed
- QG – Prescribed amount of stationary oxygen while at rest is greater than 4 liters per minute (lpm)
- QH – Oxygen conserving device is being used with an oxygen delivery system
- QJ – Services/items provided to a prisoner or patient in state or local custody, however the state or local government, as applicable, meets the requirements in 42 cfr 411.4 (b)
- QK – Medical direction of two, three, or four concurrent anesthesia procedures involving qualified individuals
- QL – Patient pronounced dead after ambulance called
- QM – Ambulance service provided under arrangement by a provider of services
- QN – Ambulance service furnished directly by a provider of services
- QP – Documentation is on file showing that the laboratory test(s) was ordered individually or ordered as a cpt-recognized panel other than automated profile codes 80002-80019, g0058, g0059, and g0060.
- QR – Prescribed amounts of stationary oxygen for daytime use while at rest and nighttime use differ and the average of the two amounts is greater than 4 liters per minute (lpm)
- QT – Recording and storage on tape by an analog tape recorder
- QW – Clia waived test
- QX – Crna service: with medical direction by a physician
- QY – Medical direction of one certified registered nurse anesthetist (crna) by an anesthesiologist
- QZ – Crna service: without medical direction by a physician