A modifier provides the means by which the reporting physician or provider can indicate that a service or procedure that has been performed has been altered by some specific circumstance but not changed in its definition or code.
Level I modifiers are codes and descriptors copyrighted by the American Medical Association's current procedural terminology (CPT).
Level II modifiers are codes and descriptors approved and maintained jointly by the alpha-numeric editorial panel (consisting of CMS, the Health Insurance Association of America, and the Blue Cross and Blue Shield Association).
| Modifier | Description | Effective | |
|---|---|---|---|
| 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 | Jul 01, 2017 | |
| 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 | Jul 01, 2017 | |
| Q7 | One class a finding | Jan 01, 1997 | |
| Q8 | Two class b findings | Jan 01, 1997 | |
| Q9 | One class b and two class c findings | Jan 01, 1997 | |
| 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) | Apr 01, 2018 | |
| 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 | Apr 01, 2018 | |
| QC | Single channel monitoring | Jan 01, 1997 | |
| QD | Recording and storage in solid state memory by a digital recorder | Jan 01, 1997 | |
| QE | Prescribed amount of stationary oxygen while at rest is less than 1 liter per minute (lpm) | Apr 01, 2018 | |
| QF | Prescribed amount of stationary oxygen while at rest exceeds 4 liters per minute (lpm) and portable oxygen is prescribed | Apr 01, 2018 | |
| QG | Prescribed amount of stationary oxygen while at rest is greater than 4 liters per minute (lpm) | Apr 01, 2018 | |
| QH | Oxygen conserving device is being used with an oxygen delivery system | Jan 01, 1997 | |
| 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) | Jan 01, 2003 | |
| QK | Medical direction of two, three, or four concurrent anesthesia procedures involving qualified individuals | Jan 01, 2001 | |
| QL | Patient pronounced dead after ambulance called | Jan 01, 1999 | |
| QM | Ambulance service provided under arrangement by a provider of services | Jan 01, 1999 | |
| QN | Ambulance service furnished directly by a provider of services | Jan 01, 1999 | |
| 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. | Mar 01, 1996 | |
| Ordering professional consulted a qualified clinical decision support mechanism for this service and the related data was provided to the furnishing professional | Jan 01, 2025 | ||
| 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) | Apr 01, 2018 | |
| QS | Monitored anesthesia care service | Jul 01, 1996 | |
| QT | Recording and storage on tape by an analog tape recorder | Jan 01, 1997 | |
| QW | Clia waived test | Oct 01, 1996 | |
| QX | Crna service: with medical direction by a physician | Jan 01, 1997 |