QN

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating that a service provider directly furnished an ambulance service. This modifier is payable under Medicare Part A but not Medicare Part B.

QP

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating 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.

QQ

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating that a claim is being submitted with a written statement of intent (SOI).

QS

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating monitored anesthesia care service.

QT

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating recording and storage on tape by an analog tape recorder.

QU

HCPCS Level II modifier that was used with CPT or HCPCS Level II codes and indicated a physician provided services in an urban health professional shortage area (HPSA). Modifier AQ, which became effective January 1, 2006, replaced the QU modifier.

Qualification period

Length of time that the insured must be totally disabled to be eligible for residual disability insurance benefits.
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US: The period during which the insured must be totally disabled before becoming eligible for residual disability benefits.