HCPCS 'Q' Modifiers (32)
| Code | Description |
| 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. |
| Ordering professional consulted a qualified clinical decision support mechanism for this service and the related data was provided to the furnishing professional Terminated: December 31, 2024 | |
| 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) |
| QS | Monitored anesthesia care service |
| 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 |