HCPCS modifier codes starting with Q

32 codes. Every code ever valid for billing is listed, including those now retired.

Code	Description	Status
Q0	Investigational clinical service provided in a clinical research study that is in an approved clinical research study	Valid
Q1	Routine clinical service provided in a clinical research study that is in an approved clinical research study	Valid
Q2	Demonstration procedure/service	Valid
Q3	Live kidney donor surgery and related services	Valid
Q4	Service for ordering/referring physician qualifies as a service exemption	Valid
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	Valid
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	Valid
Q7	One class a finding	Valid
Q8	Two class b findings	Valid
Q9	One class b and two class c findings	Valid
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)	Valid
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	Valid
QC	Single channel monitoring	Valid
QD	Recording and storage in solid state memory by a digital recorder	Valid
QE	Prescribed amount of stationary oxygen while at rest is less than 1 liter per minute (lpm)	Valid
QF	Prescribed amount of stationary oxygen while at rest exceeds 4 liters per minute (lpm) and portable oxygen is prescribed	Valid
QG	Prescribed amount of stationary oxygen while at rest is greater than 4 liters per minute (lpm)	Valid
QH	Oxygen conserving device is being used with an oxygen delivery system	Valid
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)	Valid
QK	Medical direction of two, three, or four concurrent anesthesia procedures involving qualified individuals	Valid
QL	Patient pronounced dead after ambulance called	Valid
QM	Ambulance service provided under arrangement by a provider of services	Valid
QN	Ambulance service furnished directly by a provider of services	Valid
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.	Valid
QQ	Ordering professional consulted a qualified clinical decision support mechanism for this service and the related data was provided to the furnishing professional through FY2026	Terminated
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)	Valid
QS	Monitored anesthesia care service	Valid
QT	Recording and storage on tape by an analog tape recorder	Valid
QW	Clia waived test	Valid
QX	Crna service: with medical direction by a physician	Valid
QY	Medical direction of one certified registered nurse anesthetist (crna) by an anesthesiologist	Valid
QZ	Crna service: without medical direction by a physician	Valid