Modifier Q1- Routine Clinical Service in an Approved Clinical Research Study

Identifies routine clinical services furnished to a Medicare beneficiary participating in an approved clinical research study, distinguishing routine patient care from investigational services.

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What Is Modifier Q1?

Modifier Q1 is a HCPCS Level II modifier used to identify a routine clinical service provided in an approved clinical research study.

For Medicare clinical trial billing, Q1 distinguishes routine patient-care services from the investigational item or service being studied.

CMS defines routine clinical services to include items and services that would ordinarily be covered for Medicare beneficiaries outside the research study, are used for direct patient management within the study, and are not themselves investigational clinical services.

Routine services can also include certain services necessary to provide the investigational intervention, clinically appropriate monitoring, and treatment of complications associated with participation in the qualifying clinical trial.

Modifier Q1 replaced the former QV modifier for dates of service on or after January 1, 2008.

When to Use Modifier Q1

Routine Clinical Service: The service represents routine patient care associated with participation in a qualifying clinical trial.

Approved Clinical Research Study: The beneficiary is participating in a clinical trial or research study that meets applicable Medicare coverage requirements.

Direct Patient Management: The service is used for the beneficiary's clinical management rather than solely for research data collection.

Clinical Monitoring: Qualifying monitoring that constitutes routine patient care may be reported with Q1.

Treatment of Complications: Medically necessary services used to diagnose or treat complications arising from participation in a Medicare-covered clinical trial may qualify as routine costs.

Correct Clinical Trial Claim Reporting: Q1 is reported with other required clinical trial information, including Z00.6 where applicable.

When NOT to Use Modifier Q1

Investigational Service: Use Modifier Q0 rather than Q1 when the item or service itself is being investigated as an objective of the approved clinical research study.

Research-Only Data Collection: Services performed solely to satisfy research data collection or analysis requirements and not used in the patient's clinical management are not routine costs and cannot be billed as Q1 services.

Statutorily Excluded Service: Q1 does not create Medicare coverage for an item or service excluded by statute or lacking a Medicare benefit category.

Nonqualifying Research Study: Do not use Q1 merely because a patient participates in research. Applicable Medicare clinical-trial coverage requirements must be satisfied.

Ordinary Care Unrelated to the Trial: Do not automatically append Q1 to every service a research participant receives. The service must qualify for clinical-trial reporting.

Inpatient HCPCS Reporting: CMS notes that HCPCS codes are not reported on inpatient claims, so the outpatient Q0/Q1 line-item requirements do not apply to inpatient clinical trial claims in the same manner.

Billing Example

A Medicare beneficiary participates in a qualifying clinical trial evaluating a new cancer treatment.

During the study, the beneficiary receives a medically necessary laboratory test used for routine clinical monitoring. The test is not itself the investigational service being studied and is used in the patient's clinical management.

The appropriate laboratory code is reported with Modifier Q1 because the test represents routine clinical care associated with the qualifying research study.

The claim also includes the required clinical-trial information, including ICD-10-CM Z00.6 where applicable.

CMS specifically identifies clinically appropriate monitoring, including certain laboratory testing, as a potential routine clinical service when it satisfies applicable requirements.

Documentation Requirements

Qualifying Clinical Trial: Maintain documentation establishing the beneficiary's participation in the applicable approved or qualifying clinical research study.

Routine Service: Document why the reported service represents routine patient care rather than an investigational service.

Medical Necessity: The medical record should establish why the service was clinically necessary for the beneficiary.

Relationship to Trial: Document how the service relates to patient management, monitoring, provision of the investigational service, or treatment of a research-related complication.

Clinical Trial Information: Maintain the applicable clinical trial identification information required for Medicare billing.

Diagnosis Reporting: Ensure Z00.6 and other applicable diagnoses are reported according to Medicare clinical-trial claim requirements.

Billing and Claim Considerations

Modifier Q1 is line-item specific. It identifies the particular services on the claim that qualify as routine clinical services associated with the clinical trial.

Current CMS guidance requires practitioners and suppliers reporting routine clinical-trial costs to use Q1 along with ICD-10-CM diagnosis code Z00.6 in either the primary or secondary position. CMS states that Q1 claims submitted without Z00.6 are returned as unprocessable.

For applicable institutional outpatient clinical-trial claims, CMS requires:

Condition Code 30

ICD-10-CM Z00.6

Q1 on routine clinical service lines

Q0 on investigational service lines

CMS also requires a clinical trial number on applicable claims for items and services furnished in clinical trials, studies, registries, or Coverage with Evidence Development arrangements for dates of service on or after January 1, 2014.

What Qualifies as a Routine Clinical Service?

Routine clinical services are not limited to ordinary office visits or laboratory tests.

CMS guidance indicates that qualifying routine costs may include services ordinarily covered outside the trial as well as certain services necessary for providing the investigational intervention.

Examples can include:

Routine Patient Care: Covered services the beneficiary would ordinarily receive outside the research study.

Administration Services: Certain services necessary to furnish the investigational intervention.

Clinical Monitoring: Medically appropriate monitoring used in patient management.

Complication Management: Services needed to prevent, diagnose, or treat complications resulting from participation in the clinical trial.

The key distinction is whether the service represents legitimate patient care rather than something performed solely to generate research data.

Modifier Q1 and ICD-10-CM Z00.6

Z00.6 identifies an encounter involving examination for normal comparison and control in a clinical research program.

For current Medicare practitioner and supplier clinical-trial billing, CMS requires Q1 claims to include Z00.6 in either the primary or secondary diagnosis position.

CMS states that a Q1 claim lacking Z00.6 is returned as unprocessable, with claim-processing messages indicating missing or incomplete information.

Q1 and Z00.6 therefore perform different functions:

Q1: Identifies the specific line as a routine clinical service.

Z00.6: Identifies the clinical-research context on the claim.

Using Q1 without completing the other required clinical-trial reporting elements can result in claim-processing problems.

Modifier Q1 vs. Modifier Q0

Modifier Q1: Routine clinical service furnished as part of an approved clinical research study.

Modifier Q0: Investigational clinical service furnished in an approved clinical research study.

This is the most important distinction when selecting between these modifiers.

Q0 identifies the investigational item or service being studied, while Q1 identifies qualifying routine patient-care services associated with the study. CMS has used this Q0/Q1 distinction since January 1, 2008.

Common Billing Mistakes

Confusing Q1 With Q0: Q1 identifies routine clinical services; Q0 identifies investigational clinical services.

Missing Z00.6: CMS currently requires Z00.6 on applicable Q1 practitioner and supplier claims. Claims without it are returned as unprocessable.

Billing Research-Only Services: Services performed solely for data collection or analysis and not used for patient management do not qualify as Q1 routine costs.

Applying Q1 to Every Claim Line: Q1 is line-item specific and should identify only qualifying routine clinical services.

Missing Clinical Trial Number: Applicable clinical-trial claims require the appropriate clinical trial number under current Medicare reporting requirements.

Assuming Q1 Creates Coverage: The modifier identifies the clinical-trial context but does not convert an otherwise excluded service into a covered Medicare benefit.

Common Denial Reasons

Missing Z00.6: Required clinical-research diagnosis information is absent from the claim.

Incorrect Q0/Q1 Selection: The service is investigational but reported as routine, or vice versa.

Clinical Trial Requirements Not Met: The study or beneficiary does not satisfy applicable Medicare clinical-trial coverage requirements.

Research-Only Service: The service exists solely for research data collection and does not qualify as routine patient care.

Missing Trial Information: Required clinical trial identification or institutional claim information is incomplete.

Medical Necessity Not Supported: Documentation does not establish that the routine service was medically necessary for patient care.

Frequently Asked Questions

What is the difference between Modifier Q1 and Modifier Q0?
Q1 identifies qualifying routine patient-care services associated with an approved clinical research study, while Q0 identifies an investigational clinical service being studied.

Is Z00.6 required when billing Medicare with Modifier Q1?
Yes, for applicable practitioner and supplier clinical-trial claims. Current CMS instructions require Q1 and ICD-10-CM Z00.6, and CMS states that Q1 claims without Z00.6 are returned as unprocessable.