HCPCS Level II modifier
Modifier Q2
Modifier Q2 is a HCPCS Level II modifier. CMS describes it as: Demonstration procedure/service.
Source: CMS HCPCS Level II, October 2026 file dated September 23, 2026. Publisher page
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- Modifier
- Q2
- Type
- HCPCS Level II modifier, maintained by CMS
- CMS description
- Demonstration procedure/service
- Claim form
- CMS-1500 item 24D, up to four modifiers per line. 837P SV101-3 to SV101-6.
- Guidance
- CMS HCPCS quarterly update
Related modifiers
- Q3Live kidney donor surgery and related services
- Q1Routine clinical service provided in a clinical research study that is in an approved clinical research study
- Q4Service for ordering/referring physician qualifies as a service exemption
- Q0Investigational clinical service provided in a clinical research study that is in an approved clinical research study
- Q5Service 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
- PTColorectal cancer screening test; converted to diagnostic test or other procedure
- Q6Service 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
- PSPositron emission tomography (PET) or PET/computed tomography (CT) to inform the subsequent treatment strategy of cancerous tumors when the beneficiary's treating physician determines that the PET study is needed to inform subsequent anti-tumor strategy
Related pages
Questions
What does modifier Q2 mean?
Modifier Q2 is a HCPCS Level II modifier. CMS describes it as: Demonstration procedure/service.
Is modifier Q2 a CPT or a HCPCS modifier?
Q2 is a HCPCS Level II modifier from the CMS quarterly HCPCS file. Two-digit numeric modifiers, such as 25 or 59, are CPT modifiers.
Where does modifier Q2 go on a claim?
On the CMS-1500 it goes in item 24D next to the procedure code. Each line holds up to four modifiers. On an 837P it goes in SV101-3 to SV101-6.
What denial comes back when a modifier is wrong?
A missing or mismatched modifier often comes back as CARC 4. A modifier that was not valid on the date of service comes back as CARC 182. A bundling edit the modifier should have bypassed comes back as CARC 97 or 236.